How to add zeros to the end of a column vector

Question

john iceton 2021-9-7

0
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https://ww2.mathworks.cn/matlabcentral/answers/1448639-how-to-add-zeros-to-the-end-of-a-column-vector

评论： Image Analyst 2021-9-8

I have two colum vectors that of uneven length that need to be added together as seen below:

How can I pad colum b from 5 onwards with zeros to allow the vectors to be added ?

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Answer 1

Dave B 2021-9-7

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https://ww2.mathworks.cn/matlabcentral/answers/1448639-how-to-add-zeros-to-the-end-of-a-column-vector#answer_782819

在 MATLAB Online 中打开

You can use padarray for this (or you can just do [b; zeros(numel(a)-numel(b),1)])

a = (1:9)'
a = 9×1
     1
     2
     3
     4
     5
     6
     7
     8
     9
b = (1:5)'
b = 5×1
     1
     2
     3
     4
     5
c=padarray(b,numel(a)-numel(b),0,'post')
c = 9×1
     1
     2
     3
     4
     5
     0
     0
     0
     0
c2=[b; zeros(numel(a)-numel(b),1)] % alternate
c2 = 9×1
     1
     2
     3
     4
     5
     0
     0
     0
     0
a+c
ans = 9×1
     2
     4
     6
     8
    10
     6
     7
     8
     9

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Dave B 2021-9-7

在 MATLAB Online 中打开

you can even set the last value to zero and matlab will fill in the blanks:

a = (1:9)';
b = (1:5)';
b(numel(a)) = 0
b = 9×1
     1
     2
     3
     4
     5
     0
     0
     0
     0
a+b
ans = 9×1
     2
     4
     6
     8
    10
     6
     7
     8
     9