# differential equation problems.

 0 I am trying to get the differential equation examples to work: x = var('x') y = function('y',x) desolve(diff(y,x) + y - 1, y) or t = var('t') x = function('x',t) DE = diff(x, t) + x - 1 desolve(DE, [x,t]) Both return errors. What am I doing wrong? asked Jan 18 '11 mhfrey 117 ● 2 ● 4 ● 13 Kelvin Li 443 ● 10 ● 17 Surprising! I copy pasted both the equations and they work fine for me. Shashank (Jan 18 '11)

 0 You may not be doing anything wrong. I got two different kinds of errors: TypeError: Error executing code in Maxima CODE: sage99 : ('y(x))+(diff('y(x), x, 1))+(-1)$Maxima ERROR: sage99 : ('y(x))+(diff('y(x), x, 1))+(-1)$ stdin:7094:Incorrect syntax: Too many )'s (%i87) stdin:7145:Incorrect syntax: Premature termination of input at \$. (%i88)  and sage: desolve(diff(y,x) + y - 1, y) sage103  before getting the right answer: sage: desolve(diff(y,x) + y - 1, y) (c + e^x)*e^(-x)  Then I did it from a restart and everything worked the first time, and I can't reproduce the errors anymore. Looks like the maxima interface can get itself into a state, whether because of something I'd done previously or not. But this definitely shouldn't happen: were these the same kinds of errors you saw? posted Jan 18 '11 DSM 4882 ● 12 ● 65 ● 105
 0 I had to restart and it is working now for both examples. Unfortunately I did not capture the error information. If I see it again I will capture the information and post it. Thank you for your help. posted Jan 18 '11 mhfrey 117 ● 2 ● 4 ● 13

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