i=dsolve('Dy=-8y+40sin(8t)','y(0)=5') Warning: Support for character vector or string inputs will be removed in a future release. Instead, use syms to declare variables and replace inputs such as dsolve('Dy = -3y') with syms y(t); dsolve(diff(y,

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JUAN CARLOS 2023-11-26

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2079521-i-dsolve-dy-8-y-40-sin-8-t-y-0-5-warning-support-for-character-vector-or-string-inputs-wil

评论： Walter Roberson 2023-12-11

i=dsolve('Dy=-8*y+40*sin(8*t)','y(0)=5')

Warning: Support for character vector or string inputs will be

removed in a future release. Instead, use syms to declare

variables and replace inputs such as dsolve('Dy = -3*y') with syms

y(t); dsolve(diff(y,t) == -3*y). > In dsolve (line 126)

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Noah Prisament 2023-11-27

Hi Juan, this question would be better posted in MATLAB Answers. But to resolve this warning, you can use the dsolve syntax described in the warning and explained in this documentation: https://www.mathworks.com/help/symbolic/dsolve.html which uses symbolic equations instead of an equation string.

Walter Roberson 2023-12-11

在 MATLAB Online 中打开

syms y(t)
i = dsolve(diff(y) == -8*y + 40*sin(8*t), y(0) == 5)

This leads to the result

i =

(15*exp(-8*t))/2 - (5*2^(1/2)*cos(8*t + pi/4))/2

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