How do you initialize an N*M matrix?

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Harry
Harry el 26 de Jun. de 2013
Editada: Arun el 7 de Dic. de 2022
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)
  3 comentarios
Harry
Harry el 27 de Jun. de 2013
'matrix' not found.
Tulike
Tulike el 12 de Jul. de 2017
M=zeros(N,M)

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Leah
Leah el 26 de Jun. de 2013
Editada: MathWorks Support Team el 27 de Nov. de 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 comentarios
Abhishek Inamdar
Abhishek Inamdar el 6 de Jul. de 2021
Use "X = ones(n)" and add the values based on the row and column. Use for loop to work on value addition
israt fatema
israt fatema el 25 de Ag. de 2021
Can you please show me how to assign value to A after initialize the N x M matrix? For example i need to create a vector 5 x 5 and with values x = 20 35 49 64 23

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Más respuestas (4)

Lokesh Ravindranathan
Lokesh Ravindranathan el 26 de Jun. de 2013
Editada: Lokesh Ravindranathan el 26 de Jun. de 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 comentarios
per isakson
per isakson el 26 de Jun. de 2013
Editada: per isakson el 26 de Jun. de 2013
matrix is a function in the symbolic toolbox.
Lokesh Ravindranathan
Lokesh Ravindranathan el 26 de Jun. de 2013
Oh. Thanks Isakson. I will update my answer. My MATLAB did not have symbolic Math toolbox.

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Nitin
Nitin el 26 de Jun. de 2013
you could initialize the matrix,
M = zeros(n,m);

Pau
Pau el 17 de Oct. de 2018
This should make the trick
M = double.empty(N,M,0);
https://uk.mathworks.com/help/matlab/ref/empty.html

Arun
Arun el 7 de Dic. de 2022
Editada: Arun el 7 de Dic. de 2022
Here is the documentation for multi dementional arrays in matlab
Here is an example to create and initialize a 3X3 matric
A = [1 2 3; 4 5 6; 7 8 9]
A = 3×3
1 2 3
4 5 6
7 8 9
It is simular to matrix in c programming.

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