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I have defined a list like this:

F[1][t] = ConstantArray[a1, 10]

Now I want to assign to some of the elements the value 1; I try with this:

F[1][t][[2 ;; 4]] = 1

But I get an error saying that

"F[1][t] in the part assignment is not a symbol"

It seems this happens because Mathematica thinks I want to assign a value to the elements 2 to 4 of [1] which is not a symbol in fact. How can I access to the elements of the list F[1][t] and assign them a value?

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    $\begingroup$ You might find something here to help $\endgroup$ Commented Jan 3, 2022 at 15:27
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    $\begingroup$ You have to set them through a temporary variable: F[1][t] = ConstantArray[a1, 10]; Module[{temp = F[1][t]}, temp[[2 ;; 4]] = 1; F[1][t] = temp; ]; F[1][t] See here $\endgroup$ Commented Jan 3, 2022 at 15:29

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