From 754bbf7a25a8dda49b5d08ef0d0443bbf5af0e36 Mon Sep 17 00:00:00 2001 From: Craig Jennings Date: Sun, 7 Apr 2024 13:41:34 -0500 Subject: new repository --- devdocs/c/numeric%2Fcomplex%2Fcarg.html | 55 +++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) create mode 100644 devdocs/c/numeric%2Fcomplex%2Fcarg.html (limited to 'devdocs/c/numeric%2Fcomplex%2Fcarg.html') diff --git a/devdocs/c/numeric%2Fcomplex%2Fcarg.html b/devdocs/c/numeric%2Fcomplex%2Fcarg.html new file mode 100644 index 00000000..608d566f --- /dev/null +++ b/devdocs/c/numeric%2Fcomplex%2Fcarg.html @@ -0,0 +1,55 @@ +

cargf, carg, cargl

Defined in header <complex.h> 
float       cargf( float complex z );
+		 (1) (since C99) 
double      carg( double complex z );
+		 (2) (since C99) 
long double cargl( long double complex z );
+		 (3) (since C99)
Defined in header <tgmath.h> 
#define carg( z )
+		 (4) (since C99)
+1-3) Computes the argument (also called phase angle) of z, with a branch cut along the negative real axis.
+4) Type-generic macro: if z has type long double complex, long double imaginary, or long double, cargl is called. If z has type float complex, float imaginary, or float, cargf is called. If z has type double complex, double imaginary, double, or any integer type, carg is called.

Parameters

+ +
z - complex argument

Return value

If no errors occur, returns the phase angle of z in the interval [−π; π].

+

Errors and special cases are handled as if the function is implemented as atan2(cimag(z), creal(z))

+

Example

#include <stdio.h>
+#include <complex.h>
+ 
+int main(void) 
+{
+    double complex z1 = 1.0+0.0*I;
+    printf("phase angle of %.1f%+.1fi is %f\n", creal(z1), cimag(z1), carg(z1));
+ 
+    double complex z2 = 0.0+1.0*I;
+    printf("phase angle of %.1f%+.1fi is %f\n", creal(z2), cimag(z2), carg(z2));
+ 
+    double complex z3 = -1.0+0.0*I;
+    printf("phase angle of %.1f%+.1fi is %f\n", creal(z3), cimag(z3), carg(z3));
+ 
+    double complex z4 = conj(z3); // or CMPLX(-1, -0.0)
+    printf("phase angle of %.1f%+.1fi (the other side of the cut) is %f\n",
+             creal(z4), cimag(z4), carg(z4));
+}

Output:

+
phase angle of 1.0+0.0i is 0.000000
+phase angle of 0.0+1.0i is 1.570796
+phase angle of -1.0+0.0i is 3.141593
+phase angle of -1.0-0.0i (the other side of the cut) is -3.141593

References

See also

+ + +
+
(C99)(C99)(C99)
 computes the magnitude of a complex number
(function)
+
(C99)(C99)
 computes arc tangent, using signs to determine quadrants
(function)
C++ documentation for arg
+

+ © cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
+ https://en.cppreference.com/w/c/numeric/complex/carg +

+
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