I would like to plot this solenoid toric equation in maple 11
in this file
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I'm glad to see the dot operator and I'm trying to get around some limitations since it doesn't understand general matrices and vectors. Consider the expression
T(g(a)).h(a).
In my case, T is a transpose operation and a is a vector. I'm trying to differentiate it with respect to a. The general derivative is of the form,
T(h(a)).diff(g(a),a) + T(g(a)).diff(h(a),a).
My question is how to get Maple to understand how to apply this particular derivative rule. If I just blindly apply the derivative, I get the second term fine, but the first term is not in a useful form. Basically, I need to tell diff how to carry out the product rule for these non-commutative terms.

In the attached file I have a variable RT_FR which appears in the system equation a1.

Download 2129_forMaple(RT_FR).mwsView 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.mwView file details
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.docView file details
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.