symsum wave harmonics along a string
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Walter Roberson
el 17 de Mayo de 2015
In order to use symsum() you would need to be using a symbolic formula with at least one symbolic variable in it. There is nothing in your definition of u that is obviously a free variable. Is w_n your free free variable? Perhaps, but you have written your Fw_n in terms of w_n and tau with tau not defined.
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Walter Roberson
el 17 de Mayo de 2015
Your first sin() appears to have x subscript s. What is that? Your second sin() has x without the subscript, and I cannot assume that x(s) and x are the same because if that were the case then your two sin() terms would be the same and you would have written the expression as sin^2() rather than as two terms.
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