MATLAB 'text' function not working with 'sprintf' argument

Question

Trying to print the following range of labels in a figure:

aux = {'ca155.mat','ca154.mat','ca159.mat','ca146.mat','ca148.mat','ca004.mat'};

But I need it upper case and without the extension, so I use

text(0,0,upper(sprintf([aux{i},'\b\b\b\b'])));

In the command window I get the correct output such as for i=1, i.e. CA155. However the text function on a figure doesn't work and produces:

CA155.MAT[][][][]

Except instead of brackets there are closed rectangles (I couldn't copy the character).

How can I fix this?

Instead of producing a character that deletes the previous character in a command window, why not just delete the characters from the array? aux{1}(1:end-4) removes the last 4 characters from a string. — Cris Luengo
– Cris Luengo, Commented Jan 14, 2020 at 20:02

Daniel · Accepted Answer · 2020-01-14 20:02:55Z

1

When processing your text, you did not delete the extension, you inserted backspaces. Here some insights for demonstration:

>> x=upper(sprintf([aux{i},'\b\b\b\b']))

x =

    'CA155'

>> size(x)

ans =

     1    13

>> x(1:9)

ans =

    'CA155.MAT'

>> x(1:10)

ans =

    'CA155.MA'

The first 9 characters are still there but the following backspaces delete them when working in a command window. Looks like text does not support it, and backspaces are definitely not the way to go.

Use fileparts instead:

>> [filepath,name,ext]=fileparts(aux{i})

filepath =

  0×0 empty char array


name =

    'ca155'


ext =

    '.mat'

answered Jan 14, 2020 at 20:02

Daniel

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