add numerical recipes library
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lib/nr/k_and_r/recipes/erffc.c
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8
lib/nr/k_and_r/recipes/erffc.c
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float erffc(x)
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float x;
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{
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float gammp(),gammq();
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return x < 0.0 ? 1.0+gammp(0.5,x*x) : gammq(0.5,x*x);
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}
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