Replace A single element of matrix

Hi, what I want to do is replace a single value in the 201X201 identity matrix to form a transformation matrix. I know how to form the identity matrix, but im having trouble figuring out how to replace a value. I want to replace the zero in the 201st row and 1st column with a 240. I know this probably has a an easy solution, but any help is appreciated, thanks!

Answer 1

[dpb]

x(201,1)=240;

[Odom Seng]

thanks for your reply, but this just gives me a 201 X 1 vector with a 240 at the bottom. I basically want the 201 * 201 identity matrix but with a 240 in the 201 X 1 spot.

[James Tursa]

dpb's post assumed you had already formed the identity matrix. If not, then create it first. E.g.,

x = eye(201);
x(201,1) = 240;

[Odom Seng]

Well that's embarrassing! Thanks for the quick replies, much appreciated.