Problems with using mxarrays with the step function in MATLAB Coder

Question

Sharan Duggirala 2015-4-18

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编辑： Sharan Duggirala 2015-4-20

I'm trying to convert my image processing code on MATLAB into C by using MATLAB coder. using 'imread' needs a coder.entrinsic declaration. However, this means that the output to imread will be an mxArray. This is a problem as I cannot use this with the step function. The error report from code generation is shown below:

Does anyone know a way around this? Help will be very much appreciated!

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Answer 1

Sharan Duggirala 2015-4-20

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编辑：Sharan Duggirala 2015-4-20

The answer has been found here for anyone wondering about it.

Thank you for your help!

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Answer 2

Ketan 2015-4-19

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在 MATLAB Online 中打开

You can assign the output of the extrinsically called imread to a variable of known type. For example:

% Assume IMREAD output is real uint8 [480 x 640]
I = zeros([480,640],'uint8');
I = imread(...);

Then it will not be treated as an mxArray which can only be used in a limited set of circumstances. See the following documentation for information on converting mxArrays to known types:

http://www.mathworks.com/help/coder/ug/calling-matlab-functions.html