http://www.mapleprimes.com/posts/40865-Plotting-Multiple-Systems-superimposed en-us 2026 Maplesoft, A Division of Waterloo Maple Inc. Maplesoft Document System Wed, 10 Jun 2026 20:05:58 GMT Wed, 10 Jun 2026 20:05:58 GMT The latest comments added to the Post, Plotting multiple systems ?superimposed? onto each other http://www.mapleprimes.com/images/mapleprimeswhite.jpg http://www.mapleprimes.com/posts/40865-Plotting-Multiple-Systems-superimposed http://www.mapleprimes.com/posts/40865-Plotting-Multiple-Systems-superimposed?ref=Feed:MaplePrimes:Plotting multiple systems ?superimposed? onto each other:Comments#comment75725 I can see some problems with your code, but need more information to completely resolve your problems. The main information I need is the definition of eqn. From the error message you included it appears to me that you did not execute the definition of plot1. The only outright error I see in your code is that plot2 is not a plot, it's just a function. You probably want something like: <pre> plot2 := plot( 1/2*x^2, x=-0.25..0.25 ): </pre> Here's a template for you to use. <pre> restart; with( plots ): with( DEtools ): eqn := diff(y(x),x)=y(x); # replace with the correct ODE plot1 := phaseportrait(eqn, y(x), x=-0.25..0.25, [[y(-1/2)=2],[y(3/2)=0]], titlefont=[TIMES,ROMAN,18], title=`Sec 2.1 #17`, color=grey, linecolor=[red,blue]): plot2 := plot( (1/2)*x^2, x=-0.25..0.25, color=green ): display([plot1,plot2]); </pre> I hope this is helpful. Doug <pre> --------------------------------------------------------------------- Douglas B. Meade Math, USC, Columbia, SC 29208 E-mail: mailto:meade@math.sc.edu Phone: (803) 777-6183 URL: http://www.math.sc.edu/~meade/ </pre> The latest comments added to the Post, Plotting multiple systems ?superimposed? onto each other 75725 Mon, 10 Sep 2007 17:35:14 Z Doug Meade Doug Meade http://www.mapleprimes.com/posts/40865-Plotting-Multiple-Systems-superimposed?ref=Feed:MaplePrimes:Plotting multiple systems ?superimposed? onto each other:Comments#comment81750 restart; with(plots); with(DEtools); plot1 := phaseportrait([(D(x))(t) = x(t)+exp(-y(t)), (D(y))(t) = -y(t)], [x(t), y(t)], t = -100 .. 100, [[x(0) = 0, y(0) = 1]], x = -2 .. 2, y = -2 .. 2, titlefont = [TIMES, ROMAN, 18], title = `6.1.14`, color = grey, linecolor = [red, blue]); plot2 := plot(a[1]*(x(t)+1)+a[2]*(x(t)+1)^2, x = -2 .. 2, color = green); display([plot1, plot2]) The above problem only had DE, I have 2. What do I need to change in plot2 to make this work> The latest comments added to the Post, Plotting multiple systems ?superimposed? onto each other 81750 Tue, 09 Feb 2010 06:07:36 Z Nusc Nusc http://www.mapleprimes.com/posts/40865-Plotting-Multiple-Systems-superimposed?ref=Feed:MaplePrimes:Plotting multiple systems ?superimposed? onto each other:Comments#comment81749 <p>Set a[1] = 2 and a[2] = 4/3</p> The latest comments added to the Post, Plotting multiple systems ?superimposed? onto each other 81749 Tue, 09 Feb 2010 06:08:23 Z Nusc Nusc