a bug of "plotode"?

03182016, 03:48 PM
Post: #1




a bug of "plotode"?  
03182016, 04:03 PM
Post: #2




RE: a bug of "plotode"?
Try with a precise interval in x
Code: plotode(x*sin(y),[x=10..10,y],[2,2]) Code: desolve(y'=x*sin(y)) Code: 2*atan(exp(x^2/2)/c_0)+2*n_1*pi 

03182016, 04:15 PM
Post: #3




RE: a bug of "plotode"?
(03182016 04:03 PM)parisse Wrote: Try with a precise interval in x In fact, when I tried to plotode(x*sin(y),[x=10..10,y],[2,2]), it shows "Bad argument value". Now I am confused what can we do use plotode. At the same time, desolve(y'=x*sin(y)) or desolve(y'=x*sin(y), x, y) doesn't work. 

03182016, 07:06 PM
Post: #4




RE: a bug of "plotode"?
Make sure that x and y are not assigned (purge(x,y))


03192016, 09:25 AM
Post: #5




RE: a bug of "plotode"?  
03232016, 06:28 AM
Post: #6




RE: a bug of "plotode"?
Recently I thought about trouble like the above with assigned variables or somehow similar capital X in combination with home and cas commands.
Would it be an option to print the expression with replaced variables if an error occured? That would not make you save if your assigment yields a formally correct expression and just returns an 'incorrect' result. But if the calculator reports an error it could be really helpful to see, what expression was actually evaluated. ? 

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