cabsf, cabs, cabsl
Defined in header <complex.h>
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(1) | (since C99) |
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(2) | (since C99) |
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(3) | (since C99) |
Defined in header <tgmath.h>
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(4) | (since C99) |
1-3) Computes the complex absolute value (also known as norm, modulus, or magnitude) of z
.
4) Type-generic macro: if z
has type long double complex
or long double imaginary
, cabsl
is called. If z
has type float complex
or float imaginary
, cabsf
is called. If z
has type double complex
or double imaginary
, cabs
is called. For real and integer types, the corresponding version of fabs
is called.
Parameters
z | - | complex argument |
Return value
If no errors occur, returns the absolute value (norm, magnitude) of z
.
Errors and special cases are handled as if the function is implemented as hypot(creal(z), cimag(z))
.
Example
#include <stdio.h>
#include <complex.h>
int main(void)
{
double complex z = 1.0 + 1.0*I;
printf("%.1f%+.1fi cartesian is rho=%f theta=%f polar\n",
creal(z), cimag(z), cabs(z), carg(z));
}
Output:
1.0+1.0i cartesian is rho=1.414214 theta=0.785398 polar
References
C11 standard (ISO/IEC 9899:2011):
- 7.3.8.1 The cabs functions (p: 195)
- 7.25 Type-generic math (p: 373-375)
- G.7 Type-generic math (p: 545)
C99 standard (ISO/IEC 9899:1999):
- 7.3.8.1 The cabs functions (p: 177)
- 7.22 Type-generic math (p: 335-337)
- G.7 Type-generic math (p: 480)
See also
(C99)(C99)(C99) |
computes the phase angle of a complex number (function) |
(C99) |
x|) (function) |
(C99)(C99) |
x|) (function) |
(C99)(C99)(C99) |
computes square root of the sum of the squares of two given numbers (√x2+y2) (function) |
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