sprintf into a number

Hello,

I have the simple following code and it does not work of course as sprintf makes a string and cannot be entered as a value in the matrix.

Mat=zeros(64,64,round(Zlen));
for i = 1:64
    for j = 1:64
        for k = 1:Zlen
           Mat(i,j,k)=sprintf('Ch0%d_0%d(1,%d)', i, j, k)
        end
    end
end

I know how Matlab work and that I cannot just hope to supress the ' by magic but I have these Data Matrix that are name as the following Ch01_01 / Ch01_02 / ... / Ch01_64 / Ch02_01 / Ch02_02 / Ch02_64 / Ch03_01 / etc..

However I still cannot find a turnaround that issue. Could you help me ?

Thank you

[Stephen23]

"Could you help me ?"

So far you did not tell us the most important information: how did you get all of those variables into the workspace? The place where you created those separate variables is the best place to fix your code: for example, by LOADing into an output variable.

Otherwise you will force yourself into writing slow, complex, inefficient, obfuscated, insecure, buggy code which is hard to debug: http://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

[Julien Maxime]

That is the issue. It is data exported from experimental software. I cannot change the name of the files before they are imported in the Workapace as such when i open the .mat file

[Stephen23]

"I cannot change the name of the files ..."

The filenames are irrelevant to what variables are in the MATLAB workspace.

"...before they are imported in the Workapace as such when i open the .mat file"

Then there is nothing stopping you from calling LOAD with an output argument:

S = load(..)

[Julien Maxime]

What is stopping me is that when i open the .mat matrix, i have more than 4000 files opening in the workspace and to open them all with load command I would need a loop and call them one by one, coming back to my initial issue.

[Stephen23]

"What is stopping me is that when i open the .mat matrix, i have more than 4000 files opening in the workspace and to open them all with load command I would need a loop and call them one by one, coming back to my initial issue."

So far everything you describe sounds like it could be avoided by LOADing into an output variable, as already shown.

Answer 1

[Jan]

Stephen an Walter hit the point.

% Store imported data in an array instead of polluting the workspace:
FileData = load('YourInputFile.mat');

% No loop over k required:
Mat = zeros(64, 64, round(Zlen));
for i = 1:64
    for j = 1:64
        Mat(i, j, :) = FileData.(sprintf('Ch0%d_0%d', i, j));
    end
end

Answer 2

[Walter Roberson]

Please read http://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval for information about why we strongly recommend against creating variable names dynamically.