How to save fprint as a string in .mat file

Hello everyone, I hope you are doing well. I have the following data and code which do clustering.

I want to save the result of the following which print cluster mean and max into string which store in .mat file

Like the ouput from

fprintf(formatSpec,i,Mcluster1PW) ,

fprintf(formatSpec,i,MclusterTimeseries),

fprintf(formatSpec,i,MclusterFrequncy)

fprintf(formatSpec,i,MclusterAmplitude)

will be save as string in .mat file which load and use for display

eva = evalclusters(dataset,'kmeans','silhouette','KList',[1:10]);
K=eva.OptimalK;
% K=2;
%Apply Kmeans to  the dataset with Optimal Clusters K

     
 disp('Calculating Centroid')
[idx,C,sumdist] = kmeans(dataset,K,'Display','final','Replicates',5);


Timeseriesdata=sort(dataset(:,1));


dataset_idx=zeros(size(dataset,1));
dataset_idx=dataset(:,:);
dataset_idx(:,5)=idx;
clusters = cell(K,1);
for i = 1:K
   clusters{i} = dataset_idx(dataset_idx(:,5) == i,:);
end




for i = 1:K
    T = clusters{i}(:,1);
    fprintf('\nCLUSTER %d:\n',i)
    DeltaT = diff(T);
    MclusterTimeseries = mean(DeltaT);
    formatSpec = 'Mean DeltaT of Cluster %d is %4e\n';
    fprintf(formatSpec,i,MclusterTimeseries)
    MclusterFrequncy = mean(clusters{i}(:,2));
    formatSpec = 'Mean Frequncy of Cluster %d is %4e\n';
    fprintf(formatSpec,i,MclusterFrequncy)
    MclusterAmplitude = max(clusters{i}(:,3));
    formatSpec = 'Max Amplitude of Cluster %d is %4.4f\n';
    fprintf(formatSpec,i,MclusterAmplitude)
    Mcluster1PW = mean(clusters{i}(:,4));
    formatSpec = 'Mean Pulse Width of Cluster %d is %4e\n';
    fprintf(formatSpec,i,Mcluster1PW)
end

Answer 1

[Rik]

If you want to store the text output you should use sprintf to create the formated text. Then you can use fprintf to print to the command window.

Then you have the choice to store the char vectors (i.e. the text) as variables in a mat file, or use fopen and fprintf (and fclose) to write the text to a text file.

[Stephen john]

@Rik i was trying to do that. How can i do that can you please modified the above code?

[Rik]

Which 'that' exactly? Replacing fprintf with sprintf doesn't sound like it should be the problem. So do you want to write to a text file or to a mat file?

[Walter Roberson]

for i = 1:K
    T = clusters{i}(:,1);
    OUT{1,i} = sprintf('\nCLUSTER %d:\n',i);
    DeltaT = diff(T);
    MclusterTimeseries = mean(DeltaT);
    formatSpec = 'Mean DeltaT of Cluster %d is %4e\n';
    OUT{2,i}= sprintf(formatSpec,i,MclusterTimeseries);
    MclusterFrequncy = mean(clusters{i}(:,2));
    formatSpec = 'Mean Frequncy of Cluster %d is %4e\n';
    OUT{3,i} = sprintf(formatSpec,i,MclusterFrequncy);
    MclusterAmplitude = max(clusters{i}(:,3));
    formatSpec = 'Max Amplitude of Cluster %d is %4.4f\n';
    OUT{4,i} = sprintf(formatSpec,i,MclusterAmplitude);
    Mcluster1PW = mean(clusters{i}(:,4));
    formatSpec = 'Mean Pulse Width of Cluster %d is %4e\n';
    OUT{5,i} = sprintf(formatSpec,i,Mcluster1PW);
end

OUT = OUT(:);

OutfileName = 'OutputFile.txt';
[fid, msg] = fopen(OutfileName, 'w');
if fid < 0
    error('Failed to open file "%s" because "%s"', OutfileName, msg);
end
fprintf(fid, '%s\n', OUT{:});
fclose(fid);

OutMatName = 'OutputFile.mat';
save(OutMatName, OUT);

[Stephen john]

@Walter Roberson

Error using save

Must be a text scalar.

[Stephen23]

save(OutMatName, 'OUT')
%                ^   ^

[Stephen john]

@Stephen23 can we save it as string array?

[Stephen23]

"can we save it as string array?"

OUT = string(OUT);
save(OutMatName, 'OUT')

[Walter Roberson]

OUT = string(OUT) ;

[Stephen john]

fprintf(fid, '%s\n', OUT{:});

fclose(fid);

OutMatName = 'OutputFile.mat';

OUT = string(OUT);

save(OutMatName, 'OUT')

Error using string
Conversion from cell failed. Element 31 must be convertible to a string scalar.

[Walter Roberson]

Hmmm...

Please show

size(OUT)
class(OUT)
OUT(31)
size(OUT(31))
class(OUT(31))