MATLAB: Doesn’t symprod recognize indexed variables

indexsymprodvariables

I was expecting to get: k1*k2*k3*k4. Instead . . . .

Hi,

try:

syms k(n)
symprod(k(n),n,1,4)

this should give you the expected result.

Best regards

Stephan

syms(sym('k', [4 1]))

However typically you should instead

k = sym('k', [4 1])
k(1)

You cannot use the symbolic variable of symsum() or symprod() to index a vector.

You need to create the vector of definite values first, and then sum() or prod() that definite vector.