Problems with matlab symbolic dsolve function

조회 수: 2 (최근 30일)
Amit Kumar
Amit Kumar 2014년 10월 16일
답변: Stefan Wehmeier 2014년 10월 30일
Hi I feel that something is going wrong with matlab dsolve function. Here is simple code:
syms y x
dsolve('9*D2y+y=x*exp(-x^2)')
answer:
x*exp(-x^2) + C2*cos(t/3) + C3*sin(t/3)
Solution does not have the first term. Still, how matlab gives such answer? Any ideas?

답변 (2개)

Amit Kumar
Amit Kumar 2014년 10월 16일
Any ideas?

Stefan Wehmeier
Stefan Wehmeier 2014년 10월 30일
The correct syntax is
syms y(x)
dsolve(diff(y, x, x) +y==x*exp(-x^2))
as it declares y as a function of x (and not of t). Alternatively, you can add x as a second argument to your input; but we do not recommend to use character strings.

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