Input arguments must be numeric. Matrix C must be the same size as Z. The lengths of X and Y must match the size of Z. The length of X must match the number of columns of Z. The length of Y must match the number of rows of Z. X and Y must both be vectors or both be matrices. Matrices X and Y must be the same size as Z. When Z is a vector, X and Y must also be vectors. X and Y must be same length as Z or the lengths of X and Y must match the size of Z. XI and YI must be the same size or vectors of different orientations.