converting vector<vector<double>> to mwArray

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hnde 2011-2-22

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https://ww2.mathworks.cn/matlabcentral/answers/1788-converting-vector-vector-double-to-mwarray

评论： Jonathan Ingber Katz 2020-11-15

Hello,

I am trying to pass a 2 dimensional vector (a matrix) in C++ to a C++ share library matlab function compiled by Matlab Compiler.

I am trying to convert this vector, for example myvect, to the mwArray type so that by matlab function can use it. The myvect has the following format in C++,

vector<vector<double>> myvect(2);
myvect[0].push_back(0.1);
myvect[0].push_back(0.2);
myvect[0].push_back(10);
myvect[0].push_back(20);

I am trying:

mwArray mymtrx(2, 2, mxDOUBLE_CLASS);
mymtrx.SetData(&mymtrx[0][0], 4);

But it does not work. The data in mymtrx is not the same as the data in myvect.

How can I convert myvectinto mwArray type?

Thank you

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回答（1 个）

Kaustubha Govind 2011-2-22

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https://ww2.mathworks.cn/matlabcentral/answers/1788-converting-vector-vector-double-to-mwarray#answer_2684

在 MATLAB Online 中打开

Did you have a typo calling SetData?

mwArray mymtrx(2, 2, mxDOUBLE_CLASS);
mymtrx.SetData(&myvect[0][0], 4);

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hnde 2011-2-23

Thank you for your answer.

It is exactly as you said. It works for the vector<double> case, but not for the vector<vector<double>> case.

I am out of ideas on how to do this.

Thank you for all your help.

Jonathan Ingber Katz 2020-11-15

As Kaustubha Govind said, this in the general case will not work for a vector of vectors. I believe the best way to do this is to recast your vector of vectors as a single vector.

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