Matlab reshape (), full ()

First, reshape ()

For this function, it is the refactoring matrix.

(1) Requirements: The number of matrix elements before and after reconstruction is consistent. such as 3*4 matrix can be re-constituted 2*6,2*3*2 and so on.

(2) Refactoring method: First, the matrix is converted to a vector by column, then on the basis of the vector, and according to the new matrix of the column interception composition. For example, the 3*4 matrix can re-form 2*6:

1 2 3

4 5 6

7 8 9

10 11 12

First by column: 1 4 7 10 2 5 8 11 3 6 9 12

Intercept by column of new matrix: 1 4| 7 | 2 5| 8| 3 6| 9 12

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Second, full ()

Sparse matrix Two kinds of storage methods:

A = [0, 0, 0; 0, 1, 0; 1, 0, 0]; S = Sparse (a) a = Full (S) output result:>> A = [0, 0, 0; 0, 1, 0; 1, 0, 0];Act 1:S = Sparse (A)Act 2:A = Full (s) s = (3,1) 1 (2,2) 1 A = 0 0 00 1 01 0 0

Matlab reshape (), full ()