In the attached file I have a variable RT_FR which appears in the system equation a1. Download 2129_forMaple(RT_FR).mws
View file details If I do the following (mb,tr,Ic are parameters) >RT_FR:=0: > a1 := -(PSX*sin(s1)*tr-RT_FR+mb*tr*vHn*v1)/(mb*tr^2+Ic); a1 := -11.64824973 vHn v1 then the numerical procedure - RT_FR is declared global - which is called by odeplot behaves exactly as it should. However if I do the following

I would like to plot a projection using parametric equations: x=la*cos(fi) y=fi fi=

I assigned d as 10t like this- d:=10t How do I "unassign" d? I tried the unassign command and got this: Error, (in unassign) cannot unassign `10*t' (argument must be assignable) 10 t How do I get rid of/clear/unassign what I assigned to d?

Hello all, I know several people around my university that have had this problem so I finally thought I should ask: Lets say I have some complicated integral, the integrand is a function of several variables. If I: 1)simply evaluate it and I get some function of the remaining variables. 2)try to assign it such as A:=(x,y,z)-> integral, I get A(x,y,z)=integral what I want is to first evaluate to a function and then assign that function as some name as a function of the remaining variables. I know this must be possible, but I can't seem to get it. Thanks for the help. (I can provid

Hello all. I want to be able to use Maple to do algebra with variables which do not commute with each other. Is there any way I can do this? Really, all I want to be able to do is specify that X*Y - Y*X != 0, and then have Maple recognise that for more complicated functions of X and Y. I have been looking through the documentation in the help system and have found no clues. Many thanks in advance for your help. Dave Abergel

Just a quick question again: if I create a function by way of, say: f := x->2x; then I can't use the plot builder by right-clicking the result. However, defining an expression as f := 2x; works fine. I realize that the plot builder pulls in the function literally and it doesn't like the format of x->2x. However, I'm just finishing up a student manual, and since it is a tad bit confusing, I just wanted to make sure that this is the intended behaviour, and that I'm not missing anything. Thanks again, /Ivan

Well, that last blog entry sure generated a lot of discussion! I'm going to move on to something a bit more fun and less controversial: how to generate a 3-D plot of a polyhedron. There are different ways to do this in Maple, depending on how complicated the polyhedron is and what else you want to do with it. I've uploaded a worksheet with a few simple examples. View 86_PolyhedraExample.mw on MapleNet or Download 86_PolyhedraExample.mw
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Can Maple produce plots of data with error bars ?

When I post a question, at the top of the screen it says I get one point. What is that for?

I am trying to do some calculations using very small numbers. For example evaluating (sqrt(x^2+9)-3)/x^2 for x=.1, .01, .001, .0001, .00001, .000001 and .0000001 which should result in values closer and closer to 1/6, but the calculations seem to break down for any x value smaller than .001 which surprizes me. Does Maple offer some sort of double or triple precision option that I can use to accurately do calculations with the smaller numbers?

Could some one help me to plot this population balance equation ? see the attached file Download 4968_PBE.doc
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Hi. I'm currently running Maple 10 for my project. So far I have successfully plotted 2d graphs of Re(A) vs d and Im(A) vs d. Both Re(A) and Im(A) are dependent on d. Now what I want to do is to plot a 3d graph with Re(A) in the x-axis and Im(A) in the y-axis with an independent variable of d. I can't seem to figure out how to do this with the Interactive Plot Builder and I wish I could try solving the problem by posting in this forum. I just started using Maple so any tip would be very much appreciated.

I've been asked: how do I include a mathematical expression in a plot caption without having it evaluate? An example is displaying 2(x+y) in the caption without having it appear as 2x+2y. The easiest way to do this is to create an atomic identifier from the expression in the input line. In the 2-D input line, you'll have plot(..., caption=2(x+y)). Select 2(x+y) and right-click to bring up the context menu. Then go to 2-D Math -> Convert To -> Atomic Identifier. This turns the expression into a single name. Note that it is no longer equivalent to the expression 2(x+y), even though it looks exactly like it.

Even though dsolve is great, I'm just curious as to how the "Add an initial condition" menu choice works in the Standard Mode. If I enter a simple equation like this: diff(y(x),x)=0; I would like to create the initial condition that y(0)=6. I right-click, add an initial condition and blue "reply" text comes up that looks like the IC I would enter for dsolve. However, I can't edit that IC, and it just generally does nothing. How would I go about this? Thanks, /Ivan

I have some 2-dimensional data to which I would like to fit a curve. The data is not functional, i.e. there can be multiple values of y for a given x. The curve should be continuous, but otherwise I have little idea about what form it should take. Maple provides a really nice way to plot one such curve: Statistics[ScatterPlot] with the lowess option. But I do not want to just plot the curve. I would also like to do computations with the curve. For example, I would like to compute the sum of squared residuals. What is the best way to get the curve (as a procedure, say)?