Assign nested array elements

[Robert-B]

Presently, one cannot doubly index a nested array while trying to assign a value to it.

(A_j)_i = would be a way of indexing, to read the value, but (A_j)_i := 1 would throw an error. 

Instead, you have to assign the whole array instead of just one element. 

For example, to assign 1 to the 4th element, of array A, index 2:

v₃ := 1

v^T = [0 0 0 1]

A₂ : = v

It takes two operations, using a variable that is superfluous, and makes the code harder to parse.

One can assign to any element of a multidimensional matrix, but then of course, all the dimensions must have the same length, to be padded with zeroes.  The nested array is a nice addition to MathCAD, but needs work.

Btw, the size of multilevel indexing gets too small to read.  Need a way of seeing it more clearly.

[olivierlp]

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