reshape - Script command

Reshapes the matrix A to have a given size i,j,k.The product of the specified dimensions, i*j*k*..., must be the same as that of the original matrix A.

Example

Simple example showing how to reshape a 2D matrix.

?A=[1,2,3;4,5,6];
?B=reshape(A,[2,3]); # do nothing
?B=reshape(A,[3,2]); # reshape to 3 rows, 2 columns
?B=reshape(A,[1,6]); # create single row vector
?B=transpose(A);   # transpose function, for comparison
result: 
1 2 3 
4 5 6 
result: 
1 2 3 
4 5 6 
result: 
1 5 
4 3 
2 6 
result: 
1 4 2 5 3 6 
result: 
1 4 
2 5 
3 6 

Matrices of higher dimensionality can also be reshaped.

A=matrix(2,3,4);
A(1:2,1:3,1) = [1, 2, 3; 4, 5, 6];
A(1:2,1:3,2) = [7, 8, 9; 10,11,12];
A(1:2,1:3,3) = [13,14,15;16,17,18];
A(1:2,1:3,4) = [19,20,21;22,23,24];
?A;
?B=reshape(A,[6,4]);   # reshape to 2D matrix
?B=reshape(A,[1,2*3*4]); # reshape all data into a single row vector
B=permute(A,[2,1,3]);   # transpose 1st & 2nd dimension
?C=reshape(B,[1,2*3*4]); # then reshape to a single row vector
result(i,j,1):
1 2 3 
4 5 6 
result(i,j,2):
7 8 9 
10 11 12 
result(i,j,3):
13 14 15 
16 17 18 
result(i,j,4):
19 20 21 
22 23 24 
result: 
1 7 13 19 
4 10 16 22 
2 8 14 20 
5 11 17 23 
3 9 15 21 
6 12 18 24 
result: 
1 4 2 5 3 6 7 10 8 11 9 12 13 16 14 17 15 18 19 22 20 23 21 24 
result: 
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 

See Also

List of commands , = , == , != , <= , >= , < , > , & , and , | , or , ! , ~ , eig , permute , mult , inv , flip , transpose , size