Why am I getting an : Error using sym/subsasgn (line 1058) Invalid indexing or function definition. Indexing must follow MATLAB indexing. Function arguments must be symbolic

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Hazel Can
Hazel Can 2022-4-5
回答： R 2024-1-25
Hello, I am writing a code to solve my Forward Euler Method question. I added my question here.
I am encountering an error while writing the code; error :
Error using sym/subsasgn (line 1058)
Invalid indexing or function definition. Indexing must follow MATLAB indexing. Function arguments must be symbolic variables, and function body must be sym expression.
I would be very grateful if you could help me how to fix this error.

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回答（1 个）

R
R 2024-1-25
Hello Hazel,
This error occurs when using a symbolic variable as both a summation index for the "symsum" function and an index into an array. The "symsum" function requires the summation index to be a symbolic variable type, but as far as I understand, MATLAB indexing rules do not currently allow indexing into an array with a symbolic variable.
To work around this, compute the series with a for-loop instead.
I hope this addresses the error you are facing.

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