how to save signals in sequence of numbers in '.mat' form?

I want to save my signals by new name that include 3 datas in 1 '.mat' file.

like this: Annotation1, Annotation2, ...

the problem is 'Annotation' is string and '1' is number and they don't match togther so I used "num2str()" . so, when i run my code which is in for loop and want to save files it just over writing my files or make so many number files from one data.

to solve this this problem i made two random number generator because by one it makes less "mat" files.

in conclusion, i have orgenized audio files, when i do some extractions and want to save them, so i have to save as a random method i sugessted but i can't find which mat file is related to which audio file or (PCG_resampled) ...

here's my code:

ValueOfstageOne = zeros(length(PCG_resampled),1);   
ValueOfstageThree = zeros(length(PCG_resampled),1);

for j = 1:length(PCG_resampled)
         if assigned_states (j) == 1
            ValueOfstageOne (j) = (abs(PCG_resampled(j)))/(abs(PCG_resampled(j)));
         end
    
    if assigned_states (j) == 3
       ValueOfstageThree (j) = ((abs(PCG_resampled(j)))/(abs(PCG_resampled(j))))*2;     
    end  
end

r = randperm(20,1);
f = randperm(20,1);
    save(['Annotation' num2str(r),num2str(f) '.mat'],'ValueOfstageOne','ValueOfstageThree','PCG_resampled')

[Jan]

I do not understand, what your question is.

[Walter Roberson]

"Annotation" + r + f + ".mat"

Note that double quotes instead of single quotes is important here.

[azoma zakari]

first of all, thank you for your priceless asnwer!

second of all, I don't want my numbers be random. i have 20 audio files and simply want my out put be like:

Annotation1

Annotation2

.

.

.

Annotation20

that's all, not Annotations with random numbers (like:Annotation1451). I had to choose that method because I didn't know what else I can do.

again thanks for your great help!

[Voss]

@azoma zakari: You mention that you want to "include 3 datas in 1 '.mat' file". Do these "3 datas" correspond to 3 iterations of a loop you have, where, as it is now the 2nd and 3rd iterations overwrite what was done in the 1st iteration? And you would like to have the variables written to the same 20 mat files in each iteration of the loop, but with 3 different variable names inside each mat file (or some other way to distinguish what the variables' values were in the 3 different iterations of the loop)?

Answer 1

[Jan]

for k = 1:20
    ...
    filename = sprintf('Annotation%02d.mat', k)
    save(filename, ...)
end    

This creates Annotation01.mat, Annotation02.mat, ... Inserting the leading zero let the alphabetically sorted files be sorted numerically also. To omit the leading zero:

    filename = sprintf('Annotation%d.mat', k)

[azoma zakari]

Thanks for your great answer! but, it still over wrting Data, it means that it suddenly creates 20 Annotations and over writing audio files on that 20 Annotations and all 20 Annotations are from one audio file which is the last audio file, audio 20.

let me explain more:

my first loop is this:

for j = 1:length(PCG_resampled)
         if assigned_states (j) == 1
            ValueOfstageOne (j) = (abs(PCG_resampled(j)))/(abs(PCG_resampled(j)));
         end
    
    if assigned_states (j) == 3
       ValueOfstageThree (j) = ((abs(PCG_resampled(j)))/(abs(PCG_resampled(j))))*2;     
    end  
end

length of PCG_resampled depends on length of audio file.

this code:

for k = 1:20
    ...
    filename = sprintf('Annotation%02d.mat', k)
    save(filename, ...)
end    

works pretty well but creats 20 Annotations that over write next audio on previous saved fil. it means all my 20 Annotations are from my last audio file. However, I don't know why with random numbers it works fine but it's not accurate.

again, thanks for your help!

[Jan]

Yes, this is exactly what you have asked for:

i have 20 audio files and simply want my out put be like:

Annotation1

Annotation2

.

.

.

Annotation20

Do you you want to get instead?

[azoma zakari]

As I said, your answer works but the problem is, it starts making 20 Annotation at the moment that over writes, next audio file on previous one and instead of having 20 Different Annotations from Different Audios , I have 20 Same Annotations from my last Audio.

[Jan]

Yes, of course you have. This is what you have asked for. Now you explain, that you get, what you have asked for.

I guess, an important detail is missing: you want something else. So please take the time to mention, what exactly you want instead. I cannot guess it.

What about including the code in an additional loop?

for outer_counter = 1:10
   for k = 1:20
       ...
       filename = sprintf('Annotation%02d.mat', k + (outer_counter - 1)*20)
       save(filename, ...)
   end
end

Or:

...  your code here
List = dir(fullfile(pwd, 'Annotation*.mat'));
filename = sprintf('Annotation%02d.mat', numel(List) + 1);
save(filename, ...)    

This counts how many matching files are in the current folder and uses a new index which is 1 larger.

Please do not let the readers guess, what you want, and do not waste youzr time with explaining, what you do not want.

[azoma zakari]

sure! I will explain more next time. it was my first question here sorry. thank you so much your answer is great !