I have to generate a matrix with i lines and j=i+1 collumns whose elements:

=2 if i=j;

=-1 if | i -j |=1;

=0 otherwise.

Here's my attempt at solving this problem:

`prompt='Insert number of lines';i=input(prompt)j=i+1% getting the number of lines and collumns`

if i==j A=2*ones(i,j);end% checking the first condition for i and j

else if abs(i-j)==1A=-1*ones(i,j);end% checking the second condition for i and j

elseA=zeros(i,j)% checking the third condition for i and j

endendA% displaying matrix A

And I get this error when I try run it:

`else if abs(i-j)==1 |Error: Illegal use of reserved keyword "else".`

I don't understand what I'm doing wrong.

## Best Answer