How to create .png files having same file name as the .dat file from which I'm writing the code?

I'm having .dat files having name t-0.dat,t-1.dat,t-2.dat,t-4.dat,t-16.dat,.....t-100000.dat. I want to make .png files with the same names i.e. t-0.png,t-1.png,t-2.png,.....How do I do it?

Here is my code. Here I could create files with name- fig1.png,fig2.png,fig3.png,fig4.png.(fig1 corresponding to t-0.dat, like this. But I want to name it t-0.png or fig1.png).

myfolder= '........../datafolder';
datfiles = dir('*.dat');

for k = 1 : length(datfiles)
    baseFilename= datfiles(k).name;
    data = load(datfiles(k).name);
    fullFilename= fullfile(myfolder, baseFilename);
    fprintf(1, 'Now reading %s\n', fullFilename);

      h=figure;
      scatter(data(:,1),data(:,2),50);
      hold on;
      quiver(data(:,1),data(:,2),data(:,4),data(:,5),0.3);
      saveas(h,sprintf('fig%d.png',k));
      hold off;

end

Answer 1

[Stephen23]

Use fileparts:

   [fpth,fnm] = fileparts(original_name);
   new_name = fullfile(fpth,[fnm,'.png']);

[Arghadwip Paul]

Thanks Stephen. That worked