6,330 views (last 30 days)

From the MATLAB help, it says to use:

M = matrix(N, M)

but when I apply this it says that the function 'matrix' is not recognized.

Undefined function 'matrix' for input arguments of type 'double'.

Error in experimental (line 1)

M = matrix(3,3)

Leah
on 26 Jun 2013

Edited: MathWorks Support Team
on 27 Nov 2018

To initialize an N-by-M matrix, use the “zeros” function. For example, create a 3-by-5 matrix of zeros:

A = zeros(3,5);

You can then later assign specific values to the elements of “A”.

Bogdan Goidescu
on 30 Jan 2019

ok,but,i have this problem:Write a program into a script file that creates a matrix m x n with elements that have the following values:

- The value of each element in the first line is the number of that column

- The value of each element in the first column is the line number

- Each of the other elements of the matrix have values equal to the sum between the element above and the left element

Lokesh Ravindranathan
on 26 Jun 2013

Edited: Lokesh Ravindranathan
on 26 Jun 2013

I am assuming you are trying to create an empty matrix of zeros of dimensions N*M. You can try the following instead

M = zeros(3,3)

This creates a matrix of zeros of size 3*3.

Lokesh Ravindranathan
on 26 Jun 2013

Oh. Thanks Isakson. I will update my answer. My MATLAB did not have symbolic Math toolbox.

Pau
on 17 Oct 2018

This should make the trick

M = double.empty(N,M,0);

https://uk.mathworks.com/help/matlab/ref/empty.html

Opportunities for recent engineering grads.

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

Start Hunting!
## 3 Comments

## Direct link to this comment

https://www.mathworks.com/matlabcentral/answers/80315-how-do-you-initialize-an-n-m-matrix#comment_157061

⋮## Direct link to this comment

https://www.mathworks.com/matlabcentral/answers/80315-how-do-you-initialize-an-n-m-matrix#comment_157061

## Direct link to this comment

https://www.mathworks.com/matlabcentral/answers/80315-how-do-you-initialize-an-n-m-matrix#comment_157217

⋮## Direct link to this comment

https://www.mathworks.com/matlabcentral/answers/80315-how-do-you-initialize-an-n-m-matrix#comment_157217

## Direct link to this comment

https://www.mathworks.com/matlabcentral/answers/80315-how-do-you-initialize-an-n-m-matrix#comment_468663

⋮## Direct link to this comment

https://www.mathworks.com/matlabcentral/answers/80315-how-do-you-initialize-an-n-m-matrix#comment_468663

Sign in to comment.