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Matlab ODE45 Help? 
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#1
Oct2710, 06:01 PM

P: 3

function dy = prob_52 (t,y)
dy = cos(y)  (sin (t)*y); [t,y] = ode45 (@prob_52,[0,1],0) plot (t,y) xlabel ('Time') ylabel ('Function Value') I was told my code is incorrect. Does anyone have suggestions on where I'm going wrong? Thanks 


#2
Nov610, 11:10 AM

P: 333

Not sure whats wrong with it. Probably you need a separate mfile for the function. If you need to include the function in your script try using function handle
fun =@(t,y) cos(y)  (sin (t)*y); [t,y] = ode45 (fun,[0,1],0); 


#3
Nov610, 02:13 PM

P: 3

Thanks Matematikawan.
Right now, I have a separate file named "Prob_52" that has the function and then a file with: [t,y] = ode45 (@prob_52,[0,1],0) plot (t,y) xlabel ('Time') ylabel ('Function Value') My professor is unable to run it, which makes it a fail. I'm wondering if this is because his computer can't "see" the Prob_52 file??? I will change it to the way you have it. Do you know how I can test it before I submit it? This is my last shot. If this one doesn't work, I fail my Chem E course. :( When I save my files, etc, it's fine. But I *assume* that's because I have it "all" on my PC when I'm working. 


#4
Nov610, 10:36 PM

P: 333

Matlab ODE45 Help?
I'm not an expert in matlab. Just able to run basic commands.
I think you need to submit two mfiles to your professor. One is your function mfile and the other is your script that contain ode45. If that doesn't works also, please check that your prof. matlab is not of lower version than your matlab. If you need to submit just one file then use the function handle as in my previous post. 


#5
Nov1110, 12:45 AM

P: 145

Since your problem is only a first order equation, it is possible to handle it is to use an anonymous function, as matematikawan suggested.



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