angle function in matlab formula

2022 9 22
1 个回答
更新时间：2022 9 23
18 次查看（30 天）

0 个投票

Hi everyone,
I am trying to understand the functionality of angle function of matlab. I am trying to convert my matlab code(which we use for proof of concept) to C++ implementation.
input to angle function - 0.487936206701072 + 0.660466136142335i
output of angle function - 0.934517679414299
I know it must be tan-inverse(img/real) with some other constant.
Please help me with the formula?

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回答（1 个）

Torsten
Torsten 2022-9-22
编辑：Torsten 2022-9-22
Ran in:

1 个投票

Ran in:
It's all written in the MATLAB documentation of "angle":
Algorithms
angle takes a complex number z = x + iy and uses the atan2 function to compute the angle between the positive x-axis and a ray from the origin to the point (x,y) in the xy-plane.
Here is the "proof":
format long
z = 0.487936206701072 + 0.660466136142335*1i;
angle(z)
ans =
0.934517679414299
atan2(imag(z),real(z))
ans =
0.934517679414299

7 个评论
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Manu Chaudhary
Manu Chaudhary 2022-9-22
So, i am assuming that atan2 means a simple mathematical tan inverse?
Manu Chaudhary
Manu Chaudhary 2022-9-23
It would be great help if you provide a mathematical formula or a small c/c++ code for it.
James Tursa
James Tursa 2022-9-23
编辑：James Tursa 2022-9-23
It is an included function to the standard C++ math library. E.g., here is the C++ code:
#include <cmath>
// some code here to assign real_part and imag_part
result = atan2(imag_part,real_part);
Torsten
Torsten 2022-9-23
编辑：Torsten 2022-9-23
atan2 is a c++ function.
So make an artificial mex-function that calls the c++ version of atan2 (or whatever you intend to do).
Manu Chaudhary
Manu Chaudhary 2022-9-23
Yes, atan function works in c++ but not atan2.

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