Insert first element into existing column vector...

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David Pesetsky
David Pesetsky 2018-6-13
回答： alfiya riyas 2019-12-26
Hello,
I am trying to just insert a 0 into my 48x1 double vector z, like this:
array = [0.0,z]
I keep getting:
Error using horzcat Dimensions of matrices being concatenated are not consistent.
What am I missing?
  1 个评论
Stephen23
Stephen23 2018-6-13
@David Pesetsky: What shape do you expect the output to be, when you concatenate these together horizontally: [1x1,48x1]. The first has one row, the second has 48 rows... how many rows should the output have? How many columns?

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采纳的回答

KSSV
KSSV 2018-6-13
You should join them by using vertcat. Note that your z is row matrix.
z = rand(48,1) ;
array = [0.0 ;z] % method 1
array = vertcat(0,z) % or use vertcat
  2 个评论
David Pesetsky
David Pesetsky 2018-6-13
I used the:
array = [0.0 ;z]
method. I never saw a semicolon used like that. I had a space, and a comma. Both failed.
Stephen23
Stephen23 2018-6-13
@David Pesetsky: how to define matrices is explained in the introductory tutorials:
https://www.mathworks.com/help/matlab/getting-started-with-matlab.html
These explain many basic concepts that are invaluable for using MATLAB.

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更多回答（1 个）

alfiya riyas
alfiya riyas 2019-12-26
In a column contains char vaues 'F' and 'M'.
i want to add values again 1 0 -1 in the same column using for loop
no of rows 6106 an the column no is 2
how to add these numbers usinf for ands if loop

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