reshape vector in subsequent matrix

Dear all, i have a vector made by n elements (n = 14336000). The vector is obtained by the combination (vertical concatenation) of 100 frames each of them with n1 elements (n1 = 224*640 = 143360). I would like to reshape the vector in order to have 100 matrix of 224*640 elements. I'm able to reshape the vector in 100 sub-vector of 143360 elements. After that i would like to rebuild the 224*640 matrix. Some suggestion?