MuPAD Differential equation solver

2011 4 8
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I tried following the directions from:
http://www.mathworks.com/help/toolbox/mupad/pdflinks/tutorium.pdf
on pg 8-12, but for some reason i'm getting an error with my syntax. I think it doesnt like how i'm writing apostrophe when i write y'(x).
Someone give me some ideas on how to make it work?
Thank you!

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bym
bym 2011-4-8
are you using the notebook interface?
Kenneth
Kenneth 2011-4-8
no i'm not that's probably the problem
bym
bym 2011-4-8
not necessarily, but maybe. What is your equation?
Kenneth
Kenneth 2011-4-8
I was just trying to do the example from the pdf file i found
I've written it as diffequation = ode(y'(x)-y(x)^2,y(x)) and it gives me the syntax error in matlab saying unexpected parenthesis or notation. I've never really used MuPAD before so I'm not sure how it works

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bym
bym 2011-4-8

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Try using dsolve from the matlab command window. y'(x) would be 'Dy' as in
dsolve('Dy = x',<initial conditions>,'x')
Edit
so for the example it should be:
syms x y;
dsolve('Dy-y^2','x')
- untested -

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Kenneth
Kenneth 2011-4-8
That was really helpful! Thank you very much!
Kenneth
Kenneth 2011-4-8
Do you know if you can do higher order differential equations with the dsolve?
Kenneth
Kenneth 2011-4-8
Nevermind. I read the instructions on dsolver more carefully. Thank you very much again! Really appreciate it

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Billy
Billy 2011-5-5

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2 things:
  • Be very careful to enter y(x) (never just plain y).
  • In the MuPad statement you included with your comment, you need a colon:
diffequation = ode(y'(x)-y(x)^2,y(x))
Should be:
diffequation := ode(y'(x)-y(x)^2,y(x))
instead
You can then
solve( diffequation )

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