Data extraction from MATLAB to mex-function setup

2 次查看（过去 30 天）
Rajaram B S R
Rajaram B S R 2011-11-4
Hi all,
I am trying to extract data calculated in the MATLAB environment into the mex-function set-up in vain. Could someone please point out the error in my code or anything that I am doing wrong?
int *aidx, *idx;
const mxArray *m_sort[2], *m_pctemp[3];
../* Necessary initializations for 'sort' is made and all is well so far */..
mexCallMATLAB(2, m_sort, 3, &m_pctemp, "sort"); // Works fine
/* Displays the correct data in 'm_sort' */
mexCallMATLAB(0, NULL, 1, &m_sort[0], "disp"); //(double)
mexCallMATLAB(0, NULL, 1, &m_sort[1], "disp"); //(int)
aidx = (int *)mxGetData(m_sort[1]);
OR
aidx = mxGetPr(m_sort[1]);
idx = ivector(0, 23); // memory allocation with indices range(0-23)
for (i = 1; i <= 24; i++) // Matlab indices is from 1 to 24
idx[i-1] = aidx[i]; // Wrong values from aidx[] here
I will need the array m_sort[1] that holds the indices for further processing. It looks like I am not extracting the values properly. Both the APIs fail to give me the correct values.
I believe using mxGetData with proper casting (int *) is the right way to get the integer data from m_sort[1].
Am I right? If not, Please tell me what is the right way to do it? or if I should provide more information to get me off this problem.
Thanks in advance.

请先登录，再回答此问题。

采纳的回答

Jan
Jan 2011-11-4
The sorting index is a DOUBLE vector in Matlab. Therefore you need:
int *idx;
double *aidx;
aidx = mxGetPr(m_sort[1]);
...
idx[i-1] = (int) aidx[i];
  4 个评论
显示 2更早的评论
Jan
Jan 2011-11-7
@Rajaram: Of course the documentation explains this. It might be hard to find without using the mathcing keywords.
The type of the *returned* arrays is defined inside the Mex file. The type of the input arrays can be checked by rge commands Kaustubha has mentioned already, and by mxIsDouble, mxIsSingle etc.

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Write C Functions Callable from MATLAB (MEX Files) 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by