Differentiation of matrices using diff

I need to differentiate alpha w.r.t time (da/dt) where alpha is a 19*1 matrix and time is 19*6 matrix and i tried using diff(a,t) but getting an error that difference order must be a positive scalar integer. When using diff(a)/diff(t), i'm getting a 18*6 matrix but i need a 19*6 matrix as answer.

Answer 1

[Star Strider]

Experiment with the gradient function. It may do what you want, although to take the gradient (in this context, numeric spatial derivative) of a matrix, it will be necessary to request the correct result from the two outputs it will provide.