Subscripting into an mxArray is not supported.

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hanaa 2014-6-22

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/137050-subscripting-into-an-mxarray-is-not-supported

评论： Sriharsha 2015-3-13

采纳的回答： Ryan Livingston

在 MATLAB Online 中打开

part of code is:

function m = func_Dec(in)
m = zeros(in(1,1));
n_max = in(1,2); 
level = in(1,3);

but errors occur at

Subscripting into an mxArray is not supported.
Function 'func_Dec.m' (#29.405.412), line 16, column 11:
"in(1,1)"

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Sriharsha 2015-3-13

在 MATLAB Online 中打开

I got an ERROR , while running a function inside the Simulink

""Subscripting into an mxArray is not supported.""

function y = PY_MAT(r,t,v,rcs)

coder.extrinsic('tic','toc', 'system','clear'

,'clc','num2str','str2double','strsplit','cell2mat','str2num',... 'ceil','cellstr','floor','repmat','numel');

tic

% commandStr = ['C:\LegacyApp\Python27\python PY_MAT.py ',num2str(a),'

',num2str(b),' ',num2str(c),' ',num2str(d)];

commandStr = ['C:\LegacyApp\Python27\python

D:\CM_Projects\TaccTest_FreeSpaceDynamicObjects_100315_New\src_cm4sl\run_ref.py

'... ,num2str(r'),' ',num2str(t'),' ',num2str(v'),' ',num2str(rcs')];

[status, commandOut] = system(commandStr)

y = 0;

% y = zeros(size(commandOut), class(r));

y = commandOut;

K=strsplit(y,'..');

A = cell2mat(K(1));

y = str2num(A);

toc

end

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采纳的回答

Ryan Livingston 2014-6-24

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https://ww2.mathworks.cn/matlabcentral/answers/137050-subscripting-into-an-mxarray-is-not-supported#answer_142197

在 MATLAB Online 中打开

It appears that you are using an extrinsic function (declared with coder.extrinsic) to create in, correct? In that case you need to first assign a value to in before making the extrinsic call to tell the code generation software what type to expect.

For example, suppose that the function foo returns a 3-by-4 array of real doubles. Then you would use code like:

coder.extrinsic('foo');
x = zeros(3,4);
x = foo(y);

You can see my answer:

http://www.mathworks.com/matlabcentral/answers/122471-attempt-to-extract-field-value-from-mxarray#answer_130411

for more information.

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hanaa 2014-7-4

I want to thank you for your help, and i wonder if that possible to help me more about some errors that i tried to correct some of them but others i can't correct. attached image of related errors.

hanaa 2014-7-4

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Image Analyst 2014-6-23

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/137050-subscripting-into-an-mxarray-is-not-supported#answer_142014

What are you trying to do? Zeros creates an array of zeros and you need to pass in the size of the array you want to create. Is in(1,1) that size? If so, it MUST be integer value and in that case, it will create a square array of zeros and pass it back. The other two lines don't do anything useful either.

How are you creating the array "in" in your main (calling) routine, and how are you calling func_Dec()?