# How can I write this code in matlab and have it run? ( all variables have been defined but it keeps giving me an error on this line)

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Adam Sabah on 5 Nov 2019
Answered: Robert U on 5 Nov 2019
ue = 1-4*sin((3*pi*x)/(2*L))*exp(-tmax(A/B))+4*sin((7*pi*x)/(2*L))*exp(-tmax(C/B))
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Adam Sabah on 5 Nov 2019
Edited: Adam Sabah on 5 Nov 2019
This is the matlab code that i have constructed. It ran earlier but now i can not seem to figure out what the issue is.
Steven Lord on 5 Nov 2019
What is the full and exact text of the error message you receive? Show all the text displayed in red as that might tell us exactly how to correct the error.

Robert U on 5 Nov 2019
when I run your code I get this error message:
ue = 1-4*sin((3*pi*x)/(2*L))*exp(-tmax(A/B))+4*sin((7*pi*x)/(2*L))*exp(-tmax(C/B));
!! Subscript indices must either be real positive integers or logicals.
Matlab tries to evaluate the expressions "tmax(A/B)" and "tmax(C/B)" as vector tmax at index A/B and C/B respectively. Since A/B and C/B are real numbers and not integers Matlab cannot determine the indices, despite the fact that tmax is scalar, and defined as 25. I assume you are missing multiplication signs.
Kind regards,
Robert