66 lines
659 B
C++
66 lines
659 B
C++
/* Returns the coefficient of the imaginary part of complex z
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z imag(z)
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- -------
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a + i b b
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exp(i a) sin(a)
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*/
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#include "stdafx.h"
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#include "defs.h"
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void
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eval_imag(void)
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{
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push(cadr(p1));
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eval();
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imag();
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}
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void
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imag(void)
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{
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save();
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rect();
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p1 = pop();
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push(p1);
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push(p1);
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conjugate();
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subtract();
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push_integer(2);
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divide();
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push(imaginaryunit);
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divide();
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restore();
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}
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#if SELFTEST
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static char *s[] = {
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"imag(a+i*b)",
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"b",
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"imag(1+exp(i*pi/3))",
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"1/2*3^(1/2)",
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"imag(i)",
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"1",
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"imag((-1)^(1/3))",
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"1/2*3^(1/2)",
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"imag(-i)",
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"-1",
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};
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void
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test_imag(void)
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{
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test(__FILE__, s, sizeof s / sizeof (char *));
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}
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#endif
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