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Annotation of 3BSD/libF77/tanh.c, revision 1.1

1.1     ! root        1: /*
        !             2:        tanh(arg) computes the hyperbolic tangent of its floating
        !             3:        point argument.
        !             4: 
        !             5:        sinh and cosh are called except for large arguments, which
        !             6:        would cause overflow improperly.
        !             7: */
        !             8: 
        !             9: double sinh(), cosh();
        !            10: 
        !            11: double
        !            12: tanh(arg) double arg; {
        !            13: 
        !            14:        double sign;
        !            15: 
        !            16:        sign = 1.;
        !            17:        if(arg < 0.){
        !            18:                arg = -arg;
        !            19:                sign = -1.;
        !            20:        }
        !            21: 
        !            22:        if(arg > 21.){
        !            23:                return(sign);
        !            24:        }
        !            25: 
        !            26:        return(sign*sinh(arg)/cosh(arg));
        !            27: }

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