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Patch by Nadav Horesh to make acosh and asinh better.

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Tim posted a long comment to python-dev (subject: "Controversial patch
(cmath)"; date: 6/29/00).  The conclusion is that this whole module
stinks and this patch isn't perfect, but it's better than the acosh
and asinh we had, so let's check it in.
This commit is contained in:
Guido van Rossum 2000-06-30 02:29:22 +00:00
parent 730067effc
commit f385c5e544
1 changed files with 12 additions and 7 deletions
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19
Modules/cmathmodule.c
View file

@ -57,8 +57,11 @@ Return the arc cosine of x.";
static Py_complex c_acosh(x)
Py_complex x;
{
return c_log(c_sum(x,c_prod(c_i,
c_sqrt(c_diff(c_1,c_prod(x,x))))));
Py_complex z;
z = c_sqrt(c_half);
z = c_log(c_prod(z, c_sum(c_sqrt(c_sum(x,c_1)),
c_sqrt(c_diff(x,c_1)))));
return c_sum(z, z);
}
static char c_acosh_doc [] =
@ -70,8 +73,11 @@ Return the hyperbolic arccosine of x.";
static Py_complex c_asin(x)
Py_complex x;
{
return c_neg(c_prodi(c_log(c_sum(c_prod(c_i,x),
c_sqrt(c_diff(c_1,c_prod(x,x)))))));
Py_complex z;
z = c_sqrt(c_half);
z = c_log(c_prod(z, c_sum(c_sqrt(c_sum(x,c_i)),
c_sqrt(c_diff(x,c_i)))));
return c_sum(z, z);
}
static char c_asin_doc [] =
@ -85,9 +91,8 @@ static Py_complex c_asinh(x)
{
/* Break up long expression for WATCOM */
Py_complex z;
z = c_sum(c_1,c_prod(x,x));
z = c_diff(c_sqrt(z),x);
return c_neg(c_log(z));
z = c_sum(c_1,c_prod(x, x));
return c_log(c_sum(c_sqrt(z), x));
}
static char c_asinh_doc [] =