How do I pad with zeros?

Question

Ryan 2021-5-18

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/833078-how-do-i-pad-with-zeros

编辑： Cris LaPierre 2021-5-18

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)

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David Hill 2021-5-18

Hard to understand your description. Please provide a simple example of what you want to do. It should be quite easy.

Ryan 2021-5-18

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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Answer 1

Cris LaPierre 2021-5-18

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/833078-how-do-i-pad-with-zeros#answer_702508

编辑：Cris LaPierre 2021-5-18

在 MATLAB Online 中打开

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');