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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ue = 1-4*sin((3*pi*x)/(2*L))*exp(-tmax(A/B))+4*sin((7*pi*x)/(2*L))*exp(-tmax(C/B))
Steven Lord
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.

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Answers (1)

Robert U
Robert U on 5 Nov 2019
Hi Adam Sabah,
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,


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