Can someone tell why the three parameters in section 6 of attached file is coming up undefined?

[ptc-5345203]

Can someone tell why the three parameters in section 6 of attached file is coming up undefined?

[Werner_E]

Because you confused vector/matrix index and literal index in your definitions.

If you type FTY.i:=... (thats the literal index) you define a single scalar variable. i is just a character which is part of the variable name.

If you type FTY[i:= you define the element of a vector. i has to be an integer variable greater or equal to zero (assuming ORIGIN = 0 as it is by default). So for example i:=2 and FTY[i:=111 would assign 111 to the third element of vector FTY. If FTY is not defined yet you create a column vector (0; 0; 111) that way.

You may also check if you really need that much global assignments.

[ptc-5345203]

I believe that my isssues came as a result of trying to define the following quantity : FTY to suscript m, where m has a suscript b. Does Mathcad allow such a structure?

[Werner_E]

You have to specify which kind of subscript, literal or vector.

I am not sure if you are demanding a vector consisting of vectors (nested vectors) or if you just want the index of the first vector to be an element of a second vector. Anyway, in both cases the answer is yes, its possible.

I guess you are looking for somethink like shown below and you would have to use vector indices only to do so (the parenthesis are made by MC automatically).