Why is 'print' creating a csv file?

I'm trying to save a plot as a high dpi png, however, matlab keeps svaing the output as a csv. Why is this? My code is as follows:

% Plots spectrum from E4407B Spectrum Analyser

filetoopen = '400kbps_10db_0,096k_spectrum.CSV';

% Workings
close all;

datafromfile = csvread(filetoopen, 15, 0);
freq = datafromfile(:,1);
power = datafromfile(:,2);

axisMHz = freq .* 0.000001;

filenamecomma = regexprep(filetoopen, '_', ' ');
filename = regexprep(filenamecomma, ',', '.');
expression = '(^|[\. ])\s*.';
replace = '${upper($0)}';
filename = regexprep(filename,expression,replace);
filename = newStr(1:end-4);

figure(1);    
plot(axisMHz, power);
xlabel('Frequency (MHz)');
ylabel('Power (dBm)');
title(newStr);
print(gcf, filenamecomma, '-dpng', '-r300');

I've also included an example data file. Thanks in advance.

Answer 1

[Star Strider]

Perhaps because you’re telling it to?

Running these lines:

filetoopen = '400kbps_10db_0,096k_spectrum.CSV';
filenamecomma = regexprep(filetoopen, '_', ' ')

produces:

filenamecomma =
    '400kbps 10db 0,096k spectrum.CSV'

which is what print is saving to:

    print(gcf, filenamecomma, '-dpng', '-r300');

Mystery solved!

[Ted Baker]

Thanks for that - I forgot the .csv in the filename... I got it working by adding:

% remove .csv file extension
filenamecommatosave = filenamecomma(1:end-4);

and changing my print to:

print(gcf, filenamecommatosave, '-dpng', '-r300');

Thanks again.

[Star Strider]

As always, my pleasure!

This is likely easier and more robust:

filetoopen = '400kbps_10db_0,096k_spectrum.CSV';
[~,filenamecommatosave,~] = fileparts(filetoopen);

producing:

filenamecommatosave =
    '400kbps_10db_0,096k_spectrum'