I am trying to make some student functions for differentiation, such as gradient, Jordan matrix, Hesse matrix. However, I have troubles handling matrices.
1) Is there a way to ask the dimensions of a matrix?
2) Is genmatrix the right way to go, like in
gradient(expr,var) := genmatrix(lambda([i,j],diff(expr,var[j])),1,n)
where n is the length of var?
3) Is there any difference between a vector [x,y] and a 1x2-matrix?
Thanks for any responses.
Ren?