How to remove pages from a pdf?

When using exportapp on a uifigure who contains uilabels with Tex interpreter, the pdf file contains white pages at the end and I want to delete them.

Here an example code:

File='example.pdf';
Path='D:\Downloads\';

f = uifigure;
lb=uilabel(f,"Text",'x^{2}','Interpreter','tex','Position',[50 50 100 100]);
pause(2)
exportapp(f,fullfile(Path,File))
delete(f)

Answer 1

[Isaac Marín]

We can remove pages from a pdf using pdfbox

To delete all pages but the first one, example:

Pd=org.apache.pdfbox.pdmodel.PDDocument;

PDFile=java.io.File(fullfile(Path,File));
document=Pd.load(PDFile);
npages=document.getNumberOfPages
if npages>1
    for i=npages:-1:2
        document.removePage(i-1);
    end
    document.save(fullfile(Path,File));
end
document.close;