How do you initialize an N*M matrix?

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Harry
Harry am 26 Jun. 2013
Bearbeitet: Arun am 7 Dez. 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 Kommentare
Harry
Harry am 27 Jun. 2013
'matrix' not found.
Tulike
Tulike am 12 Jul. 2017
M=zeros(N,M)

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Akzeptierte Antwort

Leah
Leah am 26 Jun. 2013
Bearbeitet: MathWorks Support Team am 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 Kommentare
Abhishek Inamdar
Abhishek Inamdar am 6 Jul. 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 am 25 Aug. 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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Weitere Antworten (4)

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

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

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

Arun
Arun am 7 Dez. 2022
Bearbeitet: Arun am 7 Dez. 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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