mat2cell
Divide matrix into cell array of matrices
Syntax
- c = mat2cell(x, m, n)
c = mat2cell(x, d1, d2, d3, ..., dn)
c = mat2cell(x, r)
Description
c = mat2cell(x, m, n) divides the two-dimensional matrix x into adjacent submatrices, each contained in a cell of the returned cell array c. Vectors m and n specify the number of rows and columns, respectively, to be assigned to the submatrices in c.
The example shown below divides a 60-by-50 matrix into six smaller matrices. MATLAB returns the new matrices in a 3-by-2 cell array:
- mat2cell(x, [10 20 30], [25 25])
The sum of the element values in m must equal the total number of rows in x. And the sum of the element values in n must equal the number of columns in x.
The elements of m and n determine the size of each cell in c by satisfying the following formula for i = 1:length(m) and j = 1:length(n):
- size(c{i,j}) == [m(i) n(j)]
c = mat2cell(x, d1, d2, d3, ..., dn) divides the multidimensional array x and returns a multidimensional cell array of adjacent submatrices of x. Each of the vector arguments d1 through dn should sum to the respective dimension sizes of x such that, for p = 1:n,
The elements of d1 through dn determine the size of each cell in c by satisfying the following formula for ip = 1:length(dp):
- size(c{i1,i2,i3,...,in}) == [d1(i1) d2(i2) d3(i3) ... dn(in)]
If x is an empty array, mat2cell returns an empty cell array. This requires that all dn inputs that correspond to the zero dimensions of x be equal to [].
For example,
- a = rand(3,0,4);
c = mat2cell(a, [1 2], [], [2 1 1]);
c = mat2cell(x, r) divides an array x by returning a single-column cell array containing full rows of x. The sum of the element values in vector r must equal the number of rows of x.
The elements of r determine the size of each cell in c, subject to the following formula for i = 1:length(r):
Remarks
mat2cell supports all array types.
Examples
Divide matrix X into 2-by-3 and 2-by-2 matrices contained in a cell array:
- X = [1 2 3 4 5; 6 7 8 9 10; 11 12 13 14 15; 16 17 18 19 20]
X =
1 2 3 4 5
6 7 8 9 10
11 12 13 14 15
16 17 18 19 20
C = mat2cell(X, [2 2], [3 2])
C =
[2x3 double] [2x2 double]
[2x3 double] [2x2 double]
C{1,1} C{1,2}
ans = ans =
1 2 3 4 5
6 7 8 9 10
C{2,1} C{2,2}
ans = ans =
11 12 13 14 15
16 17 18 19 20
مواقع النشر (المفضلة)