Set and read matrix from 'setenv'

Dear,

I have some medium input matrices that frequently change as program input. I want to move them out to external file by using 'setenv' or similar. Is that possible ? or any alternative way ?

Many thanks,

-Dan

[Guillaume]

"I want to move them out to external file"

What does that mean?

"using 'setenv' or similar"

setenv is used to modify environment variables. This has nothing to do with files.

Can you describe what you want to do (and why) in a lot more details.

[Dan NG]

My code has matrices of 3x10 (s) that need to change everytime as program input.

I have to modify code everytime for each run.

Is anyway that i can set it to variables so i can read them back ?

or I have to create .dat or .txt file and import them ?

I'm try to separate code and data.

thanks,

Answer 1

[Guillaume]

It sounds like you have a script where all the inputs are hardcoded. First, convert the script into a function with the appropriate inputs and outputs.

E.g. If you have a script like:

%inputs
something = [1 2;3 4];
somethingelse = [10 20; 30 40];

%processing code
someresult = something . ^ 2;
someotherresult = something + sqrt(somethingelse);

then it becomes:

function [someresult, someotherresult] = dosomething(something, somethingelse)
    someresult = something . ^ 2;
    someotherresult = something + sqrt(somethingelse);
end

After that it's up to you how you get the various inputs to the function. You could write a script will all the inputs and loop over them:

%all the matrices to process
manysomething = {[1 2;3 4], [5 6;7 8], [9 10 11; 12 13 14]};
manysomethingelse = {[10 20; 30 40], [50 60; 70 80], [90 100 110; 120 130 140]};
%preallocate results:
manyresults = cell(size(manysomething));
manyotherresults = cell(size(manysomething));
%loop over inputs
for idx = 1:numel(manysomething)
    [manyresults{idx}, manyotherresults{idx}] = dosomething(manysomething{idx}, manysomethingelse{idx});
end

Or you can get these inputs from text file, from spreadsheets, or from a GUI.

[Dan NG]

Thank you Guillame,

I'd like to read all input from text file. How can I do that ?