row of all 8’s

Suppose O=ones(n) Now how can I insert a row of all 8’s between rows (n-3) and (n-2) of matrix O and insert a column of all 8’s between columns 1 and 2 of matrix )

Answer 1

[Kaushik Lakshminarasimhan]

N = 10;
X = ones(N); % create a matrix of 1s
X = [X(1:N-3,:) ; 8*ones(1,N) ; X(N-2:end,:)]; % add a row of 8s between (N-3)th and (N-2)th row
X = [X(:,1) 8*ones(N+1,1) X(:,2:end)]; % add a column of 8s between 1st and 2nd columns

[Chung Di]

Error: File: ones.m Line: 4 Column: 15 Expression or statement is incorrect--possibly unbalanced (, {, or [.

[Kaushik Lakshminarasimhan]

Can you show us your code?

[Chung Di]

Have tried same as you, Nothing changed

[Chung Di]

This one

[Walter Roberson]

Copy and paste Kaushik Lakshminarasimhan's code. Spacing is important.

[Chung Di]

Where is the fault ? I tried his code

[Kaushik Lakshminarasimhan]

There should be no space between X and the parenthesis in X(1:N-3,:).

[Chung Di]

It will be really helpful if you use comments beside the code, so that I can understand the code, rather than copy paste Thank you so much

[Kaushik Lakshminarasimhan]

I didn't add comments because I thought it was self-explanatory. Anyway, I have edited my answer to include comments.