Load constants from file

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!

Answer 1

[Gerd]

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

[Macko]

Thanks a lot!

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

[Macko]

Solved! :)

fid = fopen('var.m');

while 1

tline = fgetl(fid);

if ~ischar(tline)

break

end

eval(tline)

end

Thank you so much!

Answer 2

[Daniel Shub]

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

[Macko]

Thanks! That would indeed be another possibility.

Answer 3

[ravindra]

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

[Macko]

Can you post your file content? That might enable us to answer your question more precisely. Thanks!