How to insert a blank column in the matrix

Hi All,

I have a matrix X [1 2 3 4 5]. How do I insert a blank column in between? Eg X = [1 2 3 (blank) 4 5] Thanks,

Answer 1

[dpb]

inPos=4;  % location at which to insert
Nz=1;     % number of zeros to insert
x=[x(1:inPos-1) repmat(0,1,N) x(nPos:end];

In more general case of an array the subscripts will need to run over all rows using the ":" operator and the above would be the column indices. the '1' argument in repmat would then be the value of size(x,1) of course (or use zeros with appropriate size(s).

Answer 2

[Walter Roberson]

Numeric matrices cannot have blank columns. You can put in any constant value, including -inf, inf, and NaN, but not blank.

Cell arrays can have entries which are the empty matrix.

[dpb]

Good point, Walter; I skimmed over the "blank" reading it as zero w/o even thinking of it...but, I guess it was good enough. :)