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Question: Why I get Error, invalid subscript selector in my code?

Question:Why I get Error, invalid subscript selector in my code?

mehdibgh 240 Maple
seq grid add incomplete-question
December 13 2022
0

Why I get "Error, invalid subscript selector" error in my code?

y1 := Grid:-Seq(UP1(s, U, V, W, Phi, Xi, N, a, b, II, JJ, A, B, Dd, M, Ns), s = 1 .. 7);
UKt := add(y1[i], i = 1 .. 7);

Error, invalid subscript selector

As you can see y1 is defined without any problem and have 7 seqments, but the next line warns invalid subscript selector.
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