# How do you initialize an N*M matrix?

4,223 views (last 30 days)

Show older comments

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)

### Accepted Answer

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”.

##### 3 Comments

israt fatema
on 25 Aug 2021

### More Answers (3)

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.

##### 2 Comments

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

##### 0 Comments

### See Also

### Categories

### Products

### Community Treasure Hunt

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

Start Hunting!