Automatisation of .mat files load and storing into a matrix

Hello,

I have different .mat files named as dx001, dx002,... dx0020.

I want to automate the .mat files load and storing it into a vector of matrix:

dataArray={}
for i=1:20
    temp=load(['dx00' num2str(i) '.mat'])
    dataArray{i} = ['temp.dx00' num2str(i) '.mat'];
end

This line ( dataArray{i} = ['temp.dx00' num2str(i) '.mat']; ) shows an error:

Do you have any recommandations?

Thanks,

Answer 1

[Stephen23]

N = 20;
C = cell(1,N);
for k = 1:N
    F = sprintf('dx00%d.mat',k);
    S = load(F);
    C(k) = struct2cell(S); % if there is only one variable in the file
    % or
    %C{k} = S.(sprintf('dx00%d',k));
end

https://www.mathworks.com/help/matlab/matlab_prog/generate-field-names-from-variables.html

[Haythem Zouabi]

When using .mat files as dx001, dx002,... then dx010, dx011,...dx020, how can i automate these .mat file load acoording to their names?

Thanks,

[Stephen23]

"When using .mat files as dx001, dx002,... then dx010, dx011,...dx020, how can i automate these .mat file load acoording to their names? "

That is what my answer shows. Did you try it? Did you have any specific problem when you tried it?

[Haythem Zouabi]

Yes, i tried and it works well. Thank you.

Initially, i have dx001, dx002,...., dx010,...dx020.

I change the name to dx001, dx002,..., dx0010,...dx0020 and when i use your code it works well.

If i keep the .mat files without changing the names, i used:

N=20;
C=cell(1,N)
for k = 1:10
    if k<10
        F = sprintf('dx00%d.mat',k);
        S = load(F);
        C(k) = struct2cell(S)
    else 
        F = sprintf('dx0%d.mat',k);
        S = load(F);
        C(k) = struct2cell(S)
    end
    

I am asking if there any other solution?

Also, how can i determine N automatically?

Thanks,

[Stephen23]

"Initially, i have dx001, dx002,...., dx010,...dx020."

In my opinion this is a much better naming format (for example, it can sort into numeric order using an ordinary character sort). I recommend that you keep the number of digits constant.

You can use the sprintf format string to required number of digits (padded with leading zeros):

>> sprintf('dx%03d.mat',1)
ans = dx001.mat
>> sprintf('dx%03d.mat',23)
ans = dx023.mat

[Haythem Zouabi]

Thank you. it works well.

Actually, the dx00..mat files contains the dispalcement fields measured by application of the digital image correlation. This .mat files are treated via Matlab.

I am working on kinemtic fields measurement using digital image correlation on captured images:

-image N°1-

-image N°2-

by applying the digital image correlation on the region of interest, i get the displacement field:

-correlation image: displacement of image 2/1-

the diplacement fields i get from the correlation software (the dx00...mat files) is treated via matlab and i get this figure :

-displacement fields via Matalb-

My question is:

Is it possible to automatically resize the figure of the displacement fields i get from Matlab and superpose it in the image N°1 in the exact position as it is done by the correlation software (figure: correlation image: displacement of image 2/1)?

Note that the position of the region of interest is known.

Thank you,

[Stephen23]

"My question is..."

That is quite a different topic to this thread. You should post that as a new question.

[Haythem Zouabi]

Hello,

I want to display the NaN values by setting an alphadata equal to 0 and at the same time apply an alphadata equal to 0.3 for values different to NaNs?

This is the code i use but it doesn't work:

    im=imagesc(I,'AlphaData',~isnan(I)) 
    set(im,'AlphaData',0.3); 

Thanks,