HAVE A PROBLEM WITH DSOLVE

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eduardo arango
eduardo arango 2011-9-3
HI , I AM NEW WITH MATLAB ,, PLEASE HELP ME ,, I TRY SOLVE A DIFFERENTIAL EQUATION BUT I CAN'T ,, LOOK: >> y = dsolve('2*D2y+0.02+Dy+y=2','y(0)=0','Dy(0)=3') ezplot(y,[0,20]) ??? Undefined function or method 'dsolve' for input arguments of type 'char' HOW CAN I SOLVE THIS PROBLEM?? THANK.

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回答（2 个）

Walter Roberson
Walter Roberson 2011-9-3
Are you sure that you have the Symbolic Toolbox? dsolve() is not part of basic MATLAB.
The Symbolic Toolbox is an optional extra-cost add-on to MATLAB, except that it is included in the Student Version (but in the Student Version you still have to be sure to install it.)
Kai Gehrs
Kai Gehrs 2011-9-5
Hi,
I agree with Walter. I tried the command in R2010a and it works when you have the Symbolic Math Toolbox installed.
Best regards,
-- Kai

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