can you tell me what is the significance of null[19 :=0 please?
I let the solve block solve for the whole vector t, so we need a vector with 20 elements as guess value for t.
null[19:=0 assigns a zero to the 20th element of a vector and thus creates a 20x1 vector. When I later write null+0.5, all elements of the new vector are 0,5.