In dealing with A n d column, turning it into an 8 x (n/8) matrix (n can be divided exactly by 8), but because of n is in operation process by length function, for A number of different objects, n is different, A=reshape (B, 8,0.125 * n) is wrong, because reshape function parameters must be plastic real Numbers, but each measuring A n to reshape themselves to fill A parameter is too trouble,,, how should solve the problem?