How to pad NaNs in a matrix having small size to make equivalent with matrix of large size?

Question

Sushil Pokharel 2022-6-12

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https://ww2.mathworks.cn/matlabcentral/answers/1738965-how-to-pad-nans-in-a-matrix-having-small-size-to-make-equivalent-with-matrix-of-large-size

回答： Jan 2022-6-12

Hi there,

Suppose I have given matrices A= [1 2 3; 4 5 6; 7 8 9] and B=[1 2; 3 4]. Now, I just wanted to pad NaNs in matrix B to make equal size to that of A. Your help will be greatly appreciated.

Thank you in advance.

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Answer 1

Voss 2022-6-12

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https://ww2.mathworks.cn/matlabcentral/answers/1738965-how-to-pad-nans-in-a-matrix-having-small-size-to-make-equivalent-with-matrix-of-large-size#answer_984115

在 MATLAB Online 中打开

A = [1 2 3; 4 5 6; 7 8 9];
B = [1 2; 3 4];
[ma,na] = size(A);
[mb,nb] = size(B);
% one way:
B_new = [B NaN(mb,na-nb); NaN(ma-mb,na)]
B_new = 3×3
     1     2   NaN
     3     4   NaN
   NaN   NaN   NaN
% another way:
B_new = NaN(ma,na);
B_new(1:mb,1:nb) = B
B_new = 3×3
     1     2   NaN
     3     4   NaN
   NaN   NaN   NaN

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Sushil Pokharel 2022-6-12

@Voss, thank you so much for your help. This is exactly what I wanted; I really appreciate your time and help.

Voss 2022-6-12

You're welcome!

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Answer 2

Jan 2022-6-12

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https://ww2.mathworks.cn/matlabcentral/answers/1738965-how-to-pad-nans-in-a-matrix-having-small-size-to-make-equivalent-with-matrix-of-large-size#answer_984145

在 MATLAB Online 中打开

A = [1 2 3; 4 5 6; 7 8 9];
B = [1 2; 3 4];
C = padarray(B, max(0, size(A) - size(B)), NaN, 'post')
C = 3×3
     1     2   NaN
     3     4   NaN
   NaN   NaN   NaN