Load constants from file

Question

Macko 2011-7-1

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/10660-load-constants-from-file

采纳的回答： Gerd

Hi,

I'm looking for a way to load constants defined in an external file to the workspace, keeping their original names.

I generate a row of constants, using an external application, that looks like this:

A=1

B=2

C=3

Now, I'd like to load this data (which is stored in a file) into the Matlab workspace, preserving the constant names, so that, after the import, the A, B and C constants with the corresponding values are visible in the workspace and usable in my model.

I have full control on the imported file's format, too.

Any idea on how to achieve this, is greatly appreciated! Thank you!

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Answer 1

Gerd 2011-7-1

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Hi Cristian,

you can use the eval('') command to do what you described. First you have to open the file, read line by line and

eval('A=1');

Then you have the variable in your base workspace.

Gerd

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Macko 2011-7-1

Thanks a lot!

I don't want to impose but do you happen to have some sample code on that?

Macko 2011-7-1

Solved! :)

fid = fopen('var.m');

while 1

tline = fgetl(fid);

if ~ischar(tline)

break

end

eval(tline)

end

Thank you so much!

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Answer 2

Daniel Shub 2011-7-1

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https://ww2.mathworks.cn/matlabcentral/answers/10660-load-constants-from-file#answer_14687

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Another solution is to create a file, lets call it loadconstants.m. In that file just put

A=1;
B=2;
C=3;

Then when you want to load the constants simply type

loadconstants

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Macko 2011-7-1

Thanks! That would indeed be another possibility.

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Answer 3

ravindra 2011-7-2

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Hello, I am also having same problem means I have a file name A which is having 12X36 matrix. I want to use it in my model which I am writting in .m file. So how to use this file in my program. Please help me Thank you