reshape¶
Purpose¶
Reshapes a matrix.
Format¶
-
y =
reshape
(x, r, c)¶ Parameters: - x (NxK matrix) – data
- r (scalar) – new row dimension.
- c (scalar) – new column dimension.
Returns: y (RxC matrix) – created from the elements of x.
Examples¶
y = reshape(x, 2, 6);
1 2 3 4
if x = 5 6 7 8 then y = 1 2 3 4 5 6
9 10 11 12 7 8 9 10 11 12
1 2 3
if x = 4 5 6 then y = 1 2 3 4 5 6
7 8 9 7 8 9 1 2 3
1 2 3 4 5
if x = 6 7 8 9 10 then y = 1 2 3 4 5 6
11 12 13 14 15 7 8 9 10 11 12
if x = 1 2 then y = 1 2 3 4 1 2
3 4 3 4 1 2 3 4
if x = 1 then y = 1 1 1 1 1 1
1 1 1 1 1 1
Remarks¶
Matrices are stored in row major order.
The first c elements are put into the first row of y, the second in the second row, and so on. If there are more elements in x than in y, the remaining elements are discarded. If there are not enough elements in x to fill y, then when reshape runs out of elements, it goes back to the first element of x and starts getting additional elements from there.