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HEAD
Bell 32V development
[unix-history]
/
usr
/
src
/
libF77
/
pow_zz.c
#include
"complex"
pow_zz
(
r
,
a
,
b
)
dcomplex
*
r
, *
a
, *
b
;
{
double
logr
,
logi
,
x
,
y
;
double
log
(),
exp
(),
cos
(),
sin
(),
atan2
(),
cabs
();
logr
=
log
(
cabs
(
a
->
dreal
,
a
->
dimag
) );
logi
=
atan2
(
a
->
dimag
,
a
->
dreal
);
x
=
exp
(
logr
*
b
->
dreal
-
logi
*
b
->
dimag
);
y
=
logr
*
b
->
dimag
+
logi
*
b
->
dreal
;
r
->
dreal
=
x
*
cos
(
y
);
r
->
dimag
=
x
*
sin
(
y
);
}