How to insert a blank column in the matrix

3 次查看（过去 30 天）
Racky
Racky 2015-7-17
评论： dpb 2015-7-17
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,

请先登录，再回答此问题。

采纳的回答

dpb
dpb 2015-7-17
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).

更多回答（1 个）

Walter Roberson
Walter Roberson 2015-7-17
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.
  1 个评论
dpb
dpb 2015-7-17
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. :)

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Creating and Concatenating Matrices 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by