"Unable to convert expression containing remaining symbolic function calls into double array. Argument must be expression that evaluates to number"

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Cameron Sprent 2021-3-28

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评论：张桑彪 2022-7-8

I've got a symbolic integral that I want to substitue some numbers into. Matlab will evaluate the integral for 0 < t < 4.8, but above that I get the error message.

"Unable to convert expression containing remaining symbolic function calls into double array. Argument must be expression that evaluates to number"

int(sin((7015723114167667*tau)/17592186044416 - 2630896167812875/1099511627776)*((555609333788003*tau^2*sin((pi*tau^2)/5))/7036874417766400 - (pi*cos((pi*tau^2)/5))/50), tau, 0, t)

Thanks in advance!

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张桑彪 2022-7-8

so,what should we do?

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采纳的回答

darova 2021-3-29

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It's too complicated for symbolic toolbox

Use numerical approach

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Cameron Sprent 2021-3-29

Is there a way around this? I need to calculate this function for 0 < t < 200, likely in steps of t = 0.0001. Won't calling an integral each time be very slow?

darova 2021-3-30

im afraid there is no other way. Use numerical integration

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