MATLAB/Embedded Coder File Loading

Question

I generated code for loading a mat file as follows

data=coder.load('data.mat');
a=data.a;
b=data.b;

Because one of the variables, for example "a", is very big, it is defined as a big static const array in the main function with all values initialized there.

Is there any way I can make MATLAB Coder load data from a file in C Code instead of defining it as a variable in main function?

Ryan Livingston · Accepted Answer · 2019-02-12 00:53:11Z

3

The MATLAB fread function is supported for code generation. So you can fwrite the data to a file in MATLAB and then fread it in the generated code. This will do a runtime read and avoid the giant constant in the generated code.

answered Feb 12, 2019 at 0:53

Ryan Livingston

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1 Comment

Ryan Livingston Over a year ago

Try to specify the precision argument to fread and fwrite. Say you have int32 values, then use 'int32' to write and '*int32' to read them as 32-bit integers. Just change the type name for your example.

Amin Ya · Accepted Answer · 2019-06-12 20:51:54Z

1

This is the exact code that we should use based on Ryan's answer:

load('Data.mat')
fileID = fopen('Data.bin', 'w');
fwrite(fileID, Matrix1,'uint64');
fclose(fileID);


fileID=fopen('Data.bin');
Matrix2=fread(fileID,[256,256],'uint64');
fclose(fileID);

Matrix 2 is now the same as Matrix 1. The trick for writing and reading is to use the same precision based on the data type.

edited Jun 12, 2019 at 20:51

answered Mar 5, 2019 at 0:06

Amin Ya

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