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<div id="projectname">amath
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 <span id="projectnumber">1.6.2</span>
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<div id="projectbrief">Simple command line calculator</div>
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<div class="title">atan2.c File Reference</div> </div>
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<div class="textblock"><code>#include "<a class="el" href="real_2prim_8h_source.html">prim.h</a>"</code><br />
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<code>#include "<a class="el" href="math_8h_source.html">math.h</a>"</code><br />
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Include dependency graph for atan2.c:</div>
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<p><a href="atan2_8c_source.html">Go to the source code of this file.</a></p>
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Functions</h2></td></tr>
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<tr class="memitem:a349377202ca14f79eb335b1a421fe4d8"><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="atan2_8c.html#a349377202ca14f79eb335b1a421fe4d8">atan2</a> (double y, double x)</td></tr>
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</table><table class="memberdecls">
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Variables</h2></td></tr>
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<tr class="memitem:a4f41fc56ffc7d06df51b6fbccd8c0846"><td class="memItemLeft" align="right" valign="top">static const double </td><td class="memItemRight" valign="bottom"><a class="el" href="atan2_8c.html#a4f41fc56ffc7d06df51b6fbccd8c0846">tiny</a> = 1.0e-300</td></tr>
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<tr class="separator:a4f41fc56ffc7d06df51b6fbccd8c0846"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a554f7b66b1ba49443447eb746978c268"><td class="memItemLeft" align="right" valign="top">static const double </td><td class="memItemRight" valign="bottom"><a class="el" href="atan2_8c.html#a554f7b66b1ba49443447eb746978c268">zero</a> = 0.0</td></tr>
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<tr class="separator:a554f7b66b1ba49443447eb746978c268"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a1417df9542e56520aafedb53e1112a59"><td class="memItemLeft" align="right" valign="top">static const double </td><td class="memItemRight" valign="bottom"><a class="el" href="atan2_8c.html#a1417df9542e56520aafedb53e1112a59">pi_o_4</a> = 7.8539816339744827900E-01</td></tr>
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<tr class="separator:a1417df9542e56520aafedb53e1112a59"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a5e2886167c3870717e15666048afd36a"><td class="memItemLeft" align="right" valign="top">static const double </td><td class="memItemRight" valign="bottom"><a class="el" href="atan2_8c.html#a5e2886167c3870717e15666048afd36a">pi_o_2</a> = 1.5707963267948965580E+00</td></tr>
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<tr class="memitem:a43016d873124d39034edb8cd164794db"><td class="memItemLeft" align="right" valign="top">static const double </td><td class="memItemRight" valign="bottom"><a class="el" href="atan2_8c.html#a43016d873124d39034edb8cd164794db">pi</a> = 3.1415926535897931160E+00</td></tr>
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<tr class="memitem:ac8cbe1b78ca704e98ce9f3905455f870"><td class="memItemLeft" align="right" valign="top">static const double </td><td class="memItemRight" valign="bottom"><a class="el" href="atan2_8c.html#ac8cbe1b78ca704e98ce9f3905455f870">pi_lo</a> = 1.2246467991473531772E-16</td></tr>
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<h2 class="groupheader">Function Documentation</h2>
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<td class="memname">double atan2 </td>
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<td>(</td>
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<td class="paramtype">double </td>
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<td class="paramname"><em>y</em>, </td>
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<td class="paramtype">double </td>
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<td class="paramname"><em>x</em> </td>
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<td>)</td>
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<p>Definition at line <a class="el" href="atan2_8c_source.html#l00086">86</a> of file <a class="el" href="atan2_8c_source.html">atan2.c</a>.</p>
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<p>References <a class="el" href="atan_8c_source.html#l00109">atan()</a>, <a class="el" href="atan2_8c_source.html#l00083">pi</a>, <a class="el" href="atan2_8c_source.html#l00084">pi_lo</a>, <a class="el" href="atan2_8c_source.html#l00082">pi_o_2</a>, <a class="el" href="atan2_8c_source.html#l00081">pi_o_4</a>, <a class="el" href="atan2_8c_source.html#l00079">tiny</a>, and <a class="el" href="atan2_8c_source.html#l00080">zero</a>.</p>
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<p>Referenced by <a class="el" href="clog_8c_source.html#l00046">clog()</a>, and <a class="el" href="cpow_8c_source.html#l00046">cpow()</a>.</p>
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<div class="fragment"><div class="line"><a name="l00087"></a><span class="lineno"> 87</span> {</div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keywordtype">double</span> z;</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <a class="code" href="real_2prim_8h.html#ae91287c8a5f73a8a22a100f50dc4de77">sword</a> k,m,hx,hy,ix,iy;</div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <a class="code" href="real_2prim_8h.html#a6e60fe0e0f9f8801507e15fe2d893751">uword</a> lx,ly;</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span> </div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <a class="code" href="real_2prim_8h.html#a6dadc713499e14ba3088a55409a18983">EXTRACT_WORDS</a>(hx,lx,x);</div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  ix = hx&0x7fffffff;</div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <a class="code" href="real_2prim_8h.html#a6dadc713499e14ba3088a55409a18983">EXTRACT_WORDS</a>(hy,ly,y);</div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  iy = hy&0x7fffffff;</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="keywordflow">if</span>(((ix|((lx|-lx)>>31))>0x7ff00000)||</div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  ((iy|((ly|-ly)>>31))>0x7ff00000)) <span class="comment">/* x or y is NaN */</span></div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="keywordflow">return</span> x+y;</div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="keywordflow">if</span>(((hx-0x3ff00000)|lx)==0) <span class="keywordflow">return</span> <a class="code" href="math_8h.html#a1e2f8f6d64eaa95131bc63fee34970ea">atan</a>(y); <span class="comment">/* x=1.0 */</span></div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  m = ((hy>>31)&1)|((hx>>30)&2); <span class="comment">/* 2*sign(x)+sign(y) */</span></div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span> </div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="comment">/* when y = 0 */</span></div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="keywordflow">if</span>((iy|ly)==0) {</div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="keywordflow">switch</span>(m) {</div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="keywordflow">case</span> 0:</div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="keywordflow">case</span> 1:</div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <span class="keywordflow">return</span> y; <span class="comment">/* atan(+-0,+anything)=+-0 */</span></div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="keywordflow">case</span> 2:</div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="keywordflow">return</span> <a class="code" href="atan2_8c.html#a43016d873124d39034edb8cd164794db">pi</a>+<a class="code" href="atan2_8c.html#a4f41fc56ffc7d06df51b6fbccd8c0846">tiny</a>;<span class="comment">/* atan(+0,-anything) = pi */</span></div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <span class="keywordflow">case</span> 3:</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="keywordflow">return</span> -<a class="code" href="atan2_8c.html#a43016d873124d39034edb8cd164794db">pi</a>-<a class="code" href="atan2_8c.html#a4f41fc56ffc7d06df51b6fbccd8c0846">tiny</a>;<span class="comment">/* atan(-0,-anything) =-pi */</span></div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  }</div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  }</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  <span class="comment">/* when x = 0 */</span></div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <span class="keywordflow">if</span>((ix|lx)==0) <span class="keywordflow">return</span> (hy<0)? -<a class="code" href="atan2_8c.html#a5e2886167c3870717e15666048afd36a">pi_o_2</a>-<a class="code" href="atan2_8c.html#a4f41fc56ffc7d06df51b6fbccd8c0846">tiny</a>: <a class="code" href="atan2_8c.html#a5e2886167c3870717e15666048afd36a">pi_o_2</a>+<a class="code" href="atan2_8c.html#a4f41fc56ffc7d06df51b6fbccd8c0846">tiny</a>;</div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span> </div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  <span class="comment">/* when x is INF */</span></div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  <span class="keywordflow">if</span>(ix==0x7ff00000) {</div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="keywordflow">if</span>(iy==0x7ff00000) {</div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <span class="keywordflow">switch</span>(m) {</div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="keywordflow">case</span> 0:</div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <span class="keywordflow">return</span> <a class="code" href="atan2_8c.html#a1417df9542e56520aafedb53e1112a59">pi_o_4</a>+<a class="code" href="atan2_8c.html#a4f41fc56ffc7d06df51b6fbccd8c0846">tiny</a>;<span class="comment">/* atan(+INF,+INF) */</span></div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <span class="keywordflow">case</span> 1:</div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <span class="keywordflow">return</span> -<a class="code" href="atan2_8c.html#a1417df9542e56520aafedb53e1112a59">pi_o_4</a>-<a class="code" href="atan2_8c.html#a4f41fc56ffc7d06df51b6fbccd8c0846">tiny</a>;<span class="comment">/* atan(-INF,+INF) */</span></div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="keywordflow">case</span> 2:</div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="keywordflow">return</span> 3.0*<a class="code" href="atan2_8c.html#a1417df9542e56520aafedb53e1112a59">pi_o_4</a>+<a class="code" href="atan2_8c.html#a4f41fc56ffc7d06df51b6fbccd8c0846">tiny</a>;<span class="comment">/*atan(+INF,-INF)*/</span></div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  <span class="keywordflow">case</span> 3:</div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  <span class="keywordflow">return</span> -3.0*<a class="code" href="atan2_8c.html#a1417df9542e56520aafedb53e1112a59">pi_o_4</a>-<a class="code" href="atan2_8c.html#a4f41fc56ffc7d06df51b6fbccd8c0846">tiny</a>;<span class="comment">/*atan(-INF,-INF)*/</span></div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  }</div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  } <span class="keywordflow">else</span> {</div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  <span class="keywordflow">switch</span>(m) {</div><div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  <span class="keywordflow">case</span> 0:</div><div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  <span class="keywordflow">return</span> <a class="code" href="atan2_8c.html#a554f7b66b1ba49443447eb746978c268">zero</a> ; <span class="comment">/* atan(+...,+INF) */</span></div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  <span class="keywordflow">case</span> 1:</div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  <span class="keywordflow">return</span> -<a class="code" href="atan2_8c.html#a554f7b66b1ba49443447eb746978c268">zero</a> ; <span class="comment">/* atan(-...,+INF) */</span></div><div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  <span class="keywordflow">case</span> 2:</div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  <span class="keywordflow">return</span> <a class="code" href="atan2_8c.html#a43016d873124d39034edb8cd164794db">pi</a>+<a class="code" href="atan2_8c.html#a4f41fc56ffc7d06df51b6fbccd8c0846">tiny</a> ; <span class="comment">/* atan(+...,-INF) */</span></div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  <span class="keywordflow">case</span> 3:</div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  <span class="keywordflow">return</span> -<a class="code" href="atan2_8c.html#a43016d873124d39034edb8cd164794db">pi</a>-<a class="code" href="atan2_8c.html#a4f41fc56ffc7d06df51b6fbccd8c0846">tiny</a> ; <span class="comment">/* atan(-...,-INF) */</span></div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  }</div><div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  }</div><div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  }</div><div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  <span class="comment">/* when y is INF */</span></div><div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  <span class="keywordflow">if</span>(iy==0x7ff00000) <span class="keywordflow">return</span> (hy<0)? -<a class="code" href="atan2_8c.html#a5e2886167c3870717e15666048afd36a">pi_o_2</a>-tiny: <a class="code" href="atan2_8c.html#a5e2886167c3870717e15666048afd36a">pi_o_2</a>+<a class="code" href="atan2_8c.html#a4f41fc56ffc7d06df51b6fbccd8c0846">tiny</a>;</div><div class="line"><a name="l00145"></a><span class="lineno"> 145</span> </div><div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  <span class="comment">/* compute y/x */</span></div><div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  k = (iy-ix)>>20;</div><div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  <span class="keywordflow">if</span>(k > 60) z=<a class="code" href="atan2_8c.html#a5e2886167c3870717e15666048afd36a">pi_o_2</a>+0.5*<a class="code" href="atan2_8c.html#ac8cbe1b78ca704e98ce9f3905455f870">pi_lo</a>; <span class="comment">/* |y/x| > 2**60 */</span></div><div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span>(hx<0&&k<-60) z=0.0; <span class="comment">/* |y|/x < -2**60 */</span></div><div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  <span class="keywordflow">else</span> z=<a class="code" href="math_8h.html#a1e2f8f6d64eaa95131bc63fee34970ea">atan</a>(<a class="code" href="math_8h.html#a8fb5c0b9b43a108724b355136d29d2f9">fabs</a>(y/x)); <span class="comment">/* safe to do y/x */</span></div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  <span class="keywordflow">switch</span> (m) {</div><div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  <span class="keywordflow">case</span> 0:</div><div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  <span class="keywordflow">return</span> z ; <span class="comment">/* atan(+,+) */</span></div><div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  <span class="keywordflow">case</span> 1: {</div><div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  <a class="code" href="real_2prim_8h.html#a6e60fe0e0f9f8801507e15fe2d893751">uword</a> zh;</div><div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  <a class="code" href="real_2prim_8h.html#ae62ee08d06ab4cc06d61dc1246b73195">GET_HIGH_WORD</a>(zh,z);</div><div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  <a class="code" href="real_2prim_8h.html#a6ca54776127e20149f84c290bf52f89e">SET_HIGH_WORD</a>(z, zh ^ 0x80000000);</div><div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  }</div><div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  <span class="keywordflow">return</span> z ; <span class="comment">/* atan(-,+) */</span></div><div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  <span class="keywordflow">case</span> 2:</div><div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  <span class="keywordflow">return</span> <a class="code" href="atan2_8c.html#a43016d873124d39034edb8cd164794db">pi</a>-(z-<a class="code" href="atan2_8c.html#ac8cbe1b78ca704e98ce9f3905455f870">pi_lo</a>);<span class="comment">/* atan(+,-) */</span></div><div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  <span class="keywordflow">default</span>: <span class="comment">/* case 3 */</span></div><div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  <span class="keywordflow">return</span> (z-<a class="code" href="atan2_8c.html#ac8cbe1b78ca704e98ce9f3905455f870">pi_lo</a>)-<a class="code" href="atan2_8c.html#a43016d873124d39034edb8cd164794db">pi</a>;<span class="comment">/* atan(-,-) */</span></div><div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  }</div><div class="line"><a name="l00165"></a><span class="lineno"> 165</span> }</div><div class="ttc" id="atan2_8c_html_a43016d873124d39034edb8cd164794db"><div class="ttname"><a href="atan2_8c.html#a43016d873124d39034edb8cd164794db">pi</a></div><div class="ttdeci">static const double pi</div><div class="ttdef"><b>Definition:</b> <a href="atan2_8c_source.html#l00083">atan2.c:83</a></div></div>
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<div class="ttc" id="real_2prim_8h_html_ae62ee08d06ab4cc06d61dc1246b73195"><div class="ttname"><a href="real_2prim_8h.html#ae62ee08d06ab4cc06d61dc1246b73195">GET_HIGH_WORD</a></div><div class="ttdeci">#define GET_HIGH_WORD(i, d)</div><div class="ttdoc">Get the more significant 32 bit int from a double. </div><div class="ttdef"><b>Definition:</b> <a href="real_2prim_8h_source.html#l00165">prim.h:165</a></div></div>
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<div class="ttc" id="real_2prim_8h_html_a6dadc713499e14ba3088a55409a18983"><div class="ttname"><a href="real_2prim_8h.html#a6dadc713499e14ba3088a55409a18983">EXTRACT_WORDS</a></div><div class="ttdeci">#define EXTRACT_WORDS(ix0, ix1, d)</div><div class="ttdoc">Get two 32 bit ints from a double. </div><div class="ttdef"><b>Definition:</b> <a href="real_2prim_8h_source.html#l00153">prim.h:153</a></div></div>
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<div class="ttc" id="real_2prim_8h_html_ae91287c8a5f73a8a22a100f50dc4de77"><div class="ttname"><a href="real_2prim_8h.html#ae91287c8a5f73a8a22a100f50dc4de77">sword</a></div><div class="ttdeci">signed int sword</div><div class="ttdoc">32 bit signed integer. </div><div class="ttdef"><b>Definition:</b> <a href="real_2prim_8h_source.html#l00107">prim.h:107</a></div></div>
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<div class="ttc" id="math_8h_html_a8fb5c0b9b43a108724b355136d29d2f9"><div class="ttname"><a href="math_8h.html#a8fb5c0b9b43a108724b355136d29d2f9">fabs</a></div><div class="ttdeci">double fabs(double x)</div><div class="ttdoc">Returns the absolute value of x. </div><div class="ttdef"><b>Definition:</b> <a href="fabs_8c_source.html#l00051">fabs.c:51</a></div></div>
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<div class="ttc" id="atan2_8c_html_ac8cbe1b78ca704e98ce9f3905455f870"><div class="ttname"><a href="atan2_8c.html#ac8cbe1b78ca704e98ce9f3905455f870">pi_lo</a></div><div class="ttdeci">static const double pi_lo</div><div class="ttdef"><b>Definition:</b> <a href="atan2_8c_source.html#l00084">atan2.c:84</a></div></div>
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<div class="ttc" id="real_2prim_8h_html_a6e60fe0e0f9f8801507e15fe2d893751"><div class="ttname"><a href="real_2prim_8h.html#a6e60fe0e0f9f8801507e15fe2d893751">uword</a></div><div class="ttdeci">unsigned int uword</div><div class="ttdoc">32 bit unsigned integer. </div><div class="ttdef"><b>Definition:</b> <a href="real_2prim_8h_source.html#l00101">prim.h:101</a></div></div>
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<div class="ttc" id="atan2_8c_html_a5e2886167c3870717e15666048afd36a"><div class="ttname"><a href="atan2_8c.html#a5e2886167c3870717e15666048afd36a">pi_o_2</a></div><div class="ttdeci">static const double pi_o_2</div><div class="ttdef"><b>Definition:</b> <a href="atan2_8c_source.html#l00082">atan2.c:82</a></div></div>
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<div class="ttc" id="atan2_8c_html_a4f41fc56ffc7d06df51b6fbccd8c0846"><div class="ttname"><a href="atan2_8c.html#a4f41fc56ffc7d06df51b6fbccd8c0846">tiny</a></div><div class="ttdeci">static const double tiny</div><div class="ttdef"><b>Definition:</b> <a href="atan2_8c_source.html#l00079">atan2.c:79</a></div></div>
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<div class="ttc" id="math_8h_html_a1e2f8f6d64eaa95131bc63fee34970ea"><div class="ttname"><a href="math_8h.html#a1e2f8f6d64eaa95131bc63fee34970ea">atan</a></div><div class="ttdeci">double atan(double x)</div><div class="ttdoc">Inverse trigonometric tangent function. </div><div class="ttdef"><b>Definition:</b> <a href="atan_8c_source.html#l00109">atan.c:109</a></div></div>
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<div class="ttc" id="atan2_8c_html_a554f7b66b1ba49443447eb746978c268"><div class="ttname"><a href="atan2_8c.html#a554f7b66b1ba49443447eb746978c268">zero</a></div><div class="ttdeci">static const double zero</div><div class="ttdef"><b>Definition:</b> <a href="atan2_8c_source.html#l00080">atan2.c:80</a></div></div>
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<div class="ttc" id="atan2_8c_html_a1417df9542e56520aafedb53e1112a59"><div class="ttname"><a href="atan2_8c.html#a1417df9542e56520aafedb53e1112a59">pi_o_4</a></div><div class="ttdeci">static const double pi_o_4</div><div class="ttdef"><b>Definition:</b> <a href="atan2_8c_source.html#l00081">atan2.c:81</a></div></div>
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<div class="ttc" id="real_2prim_8h_html_a6ca54776127e20149f84c290bf52f89e"><div class="ttname"><a href="real_2prim_8h.html#a6ca54776127e20149f84c290bf52f89e">SET_HIGH_WORD</a></div><div class="ttdeci">#define SET_HIGH_WORD(d, v)</div><div class="ttdoc">Set the more significant 32 bits of a double from an int. </div><div class="ttdef"><b>Definition:</b> <a href="real_2prim_8h_source.html#l00199">prim.h:199</a></div></div>
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Here is the call graph for this function:</div>
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<div class="center"><img src="atan2_8c_a349377202ca14f79eb335b1a421fe4d8_cgraph.png" border="0" usemap="#atan2_8c_a349377202ca14f79eb335b1a421fe4d8_cgraph" alt=""/></div>
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<p><div class="dynheader">
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Here is the caller graph for this function:</div>
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<area shape="rect" id="node36" href="structRealNumber.html#aaf9c066a4b9e9d845edefd40f614a517" title="Expontation function. " alt="" coords="467,816,605,843"/>
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<h2 class="groupheader">Variable Documentation</h2>
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<td class="memname">const double pi = 3.1415926535897931160E+00</td>
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<span class="mlabels"><span class="mlabel">static</span></span> </td>
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<p>Definition at line <a class="el" href="atan2_8c_source.html#l00083">83</a> of file <a class="el" href="atan2_8c_source.html">atan2.c</a>.</p>
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<p>Referenced by <a class="el" href="atan2_8c_source.html#l00086">atan2()</a>.</p>
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<td class="memname">const double pi_lo = 1.2246467991473531772E-16</td>
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<p>Definition at line <a class="el" href="atan2_8c_source.html#l00084">84</a> of file <a class="el" href="atan2_8c_source.html">atan2.c</a>.</p>
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<p>Referenced by <a class="el" href="atan2_8c_source.html#l00086">atan2()</a>.</p>
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<td class="memname">const double pi_o_2 = 1.5707963267948965580E+00</td>
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<p>Definition at line <a class="el" href="atan2_8c_source.html#l00082">82</a> of file <a class="el" href="atan2_8c_source.html">atan2.c</a>.</p>
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<p>Referenced by <a class="el" href="atan2_8c_source.html#l00086">atan2()</a>.</p>
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<a class="anchor" id="a1417df9542e56520aafedb53e1112a59"></a>
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<td class="memname">const double pi_o_4 = 7.8539816339744827900E-01</td>
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<p>Definition at line <a class="el" href="atan2_8c_source.html#l00081">81</a> of file <a class="el" href="atan2_8c_source.html">atan2.c</a>.</p>
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<p>Referenced by <a class="el" href="atan2_8c_source.html#l00086">atan2()</a>.</p>
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<td class="memname">const double tiny = 1.0e-300</td>
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<p>Definition at line <a class="el" href="atan2_8c_source.html#l00079">79</a> of file <a class="el" href="atan2_8c_source.html">atan2.c</a>.</p>
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<p>Referenced by <a class="el" href="atan2_8c_source.html#l00086">atan2()</a>.</p>
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<td class="memname">const double zero = 0.0</td>
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<p>Definition at line <a class="el" href="atan2_8c_source.html#l00080">80</a> of file <a class="el" href="atan2_8c_source.html">atan2.c</a>.</p>
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<p>Referenced by <a class="el" href="atan2_8c_source.html#l00086">atan2()</a>.</p>
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