ATAN(3) 1 ATAN(3)atan - Arc tangentSYNOPSIS
float atan (float $arg)
DESCRIPTION
Returns the arc tangent of $arg in radians. atan(3) is the complementary function of tan(3), which means that a==tan(atan(a)) for every
value of a that is within atan(3)'s range.
PARAMETERS
o $arg
- The argument to process
RETURN VALUES
The arc tangent of $arg in radians.
SEE ALSO tan(3), atanh(3), asin(3), acos(3).
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ATAN(3) BSD Library Functions Manual ATAN(3)NAME
atan -- arc tangent function of one variable
SYNOPSIS
#include <math.h>
double
atan(double x);
long double
atanl(long double x);
float
atanf(float x);
DESCRIPTION
The atan() function computes the principal value of the arc tangent of x. The result is in the range [-pi/2, +pi/2].
SPECIAL VALUES
atan(+-0) returns +-0.
atan(+-infinity) returns +-pi/2
VECTOR OPERATIONS
If you need to apply the atan() function to SIMD vectors or arrays, using the following functions provided by the Accelerate.framework may
give significantly better performance:
#include <Accelerate/Accelerate.h>
vFloat vatanf(vFloat x);
void vvatanf(float *y, const float *x, const int *n);
void vvatan(double *y, const double *x, const int *n);
SEE ALSO acos(3), asin(3), atan2(3), cos(3), cosh(3), sin(3), sinh(3), tan(3), tanh(3), math(3) The atan() function conforms to ISO/IEC 9899:2011.
BSD December 11, 2006 BSD
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I need help setting it up on a Linux box. (1 Reply)
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Hello All,
I need your help in the following situation. I have a 100x100 matrix with angle values ranging from -180 to 180. I would like to calculate the atan2 values for the above mentioned matrix, and the output should be in the same format (100x100 matrix).
I tried the following code:
... (3 Replies)