How to use min and max function in mex

Question

A R 2020-2-14

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/505451-how-to-use-min-and-max-function-in-mex

回答： Geoff Hayes 2020-2-14

Hi, I have a 1x256 double data, and i need to find the maximum and minimum value in mex file. I tried using min() and max(), and fmin() and fmax(), but i get errors like this

"incompatible type for argument 1 of 'fmin' b=fmin(data);"

"note: expected 'double' but argument is of type 'double *' extern double __cdecl fmin (double, double);"

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Geoff Hayes 2020-2-14

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/505451-how-to-use-min-and-max-function-in-mex#answer_415637

在 MATLAB Online 中打开

A - The error message is telling you what is wrong

expected 'double' but argument is of type 'double *'extern double __cdecl fmin (double, double);

The min, max, fmin, and fmax functions expect inputs of type double (or float) but you are passing in a pointer to an array of doubles (or floats). You may need to write some code to loop over each element in the array (or perhaps you can use std::min or std::min_element if available).