How can I automatically let matlab input the file in sequence?

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MatLab

How can I let Matlab automatically input the file itself rather than one by one myself?

I mean, I want to put `Sample 1.wav` and then output `Sample 1.png` and then
put `Sample 2.wav` and then output `Sample 2.png` and then put `Sample 3.wav` and then output `Sample 3.png`

I do not want to type myself 1, 2, 3 and rather let the matlab run itself from `1 to 1,000`

What I have tried:

[y,Fs] = audioread('sample1.wav');
    spectrogram(y,'yaxis')
    saveas(gcf,'sample1.png')

Then

[y,Fs] = audioread('sample2.wav');
    spectrogram(y,'yaxis')
    saveas(gcf,'sample2.png')

Then

[y,Fs] = audioread('sample3.wav');
    spectrogram(y,'yaxis')
    saveas(gcf,'sample3.png')