How do I pad with zeros?

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Ryan
Ryan il 18 Mag 2021
Modificato: Cris LaPierre il 18 Mag 2021
Rather than extracting the last row from the top and bottom of X_proj_corrected, I want to add 100 rows of zeros to either the top or bottom of X_proj_corrected using padarray function?
%Extract last row from X_proj_corrected sinogram from top and bottom
X_proj_corrected_padded100 = [X_proj_corrected(1,:); X_proj_corrected];
X_proj_corrected_padded100 = [X_proj_corrected; X_proj_corrected (size(X_proj_corrected,1),:)];
%Using last row from top and bottom 100 rows padded top and bottom using IPT
X_proj_corrected_padded100 = padarray(X_proj_corrected,100,'replicate','both');
figure
imagesc(X_proj_corrected_padded100)
  2 Commenti
David Hill
David Hill il 18 Mag 2021
Hard to understand your description. Please provide a simple example of what you want to do. It should be quite easy.
Ryan
Ryan il 18 Mag 2021
Hi David, rather than extracting the last row from the top and bottom of X_proj_corrected, I want to add 100 rows of zeros to either the top or bottom of X_proj_corrected using padarray function? Thanks.

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Cris LaPierre
Cris LaPierre il 18 Mag 2021
Modificato: Cris LaPierre il 18 Mag 2021
To pad with 100 rows of zeros, do the following
% to add to the top
X_proj_corrected = padarray(X_proj_corrected,100,'pre');
% to add to the bottom
X_proj_corrected = padarray(X_proj_corrected,100,'post');
  1 Commento
Ryan
Ryan il 18 Mag 2021
Great! Thanks Cris, now working as expected.

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