Insert first element into existing column vector...

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?

[Stephen23]

@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?

Answer 1

[KSSV]

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

[David Pesetsky]

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]

@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.

Answer 2

[alfiya riyas]

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