Can someone help me with the Dagger command in the Physics package ? I can't seem to get it to work for matrices. thanks,

I'm just learning to write Maplets for the purpose of using them as a teaching tool. Two questions: 1. I'd like to have a slider that updates a plot argument AND plays the plot's animation but I can't seem to figure out how to write two controls into the slider's options. (I've tried "Action(Evaluate...,SetOption...) to no avail. 2. Is it possible to have the location of the slider read in 'real-time' i.e. as the user moves the slider back and forth a feature in a plot changes? It seems as if the 'onchange' option is required but I can't seem to get this going either. Cheers, Co

I am trying to find a simple way to convert an expression in D notation to the corresponding expression in Diff notation. In particular I am interested in expressions, such as -D[1](f)(x-y,z-y)-D[2](f)(x-y,z-y), which should become Diff(f(x-y,z-y),y). Can maple handle this?

I am trying to produce a publication-quality graph. The graph consists of several curves and is a combination (using the display command) of some output from plot and odeplot. I have uploaded the Maple 10 worksheet, plotFig1.mw, that produces the graph so that others can see what I've done. I have also uploaded plotFig1.eps, the encapsulated postscript file that contains the graph exported from the final graphic in this worksheet. I have tried different possibilities but am still disappointed with the quality of the curves produced, especially the "aliasing" (zigzagging horizontal and vertical line segments that poorly simulate smoothness) near the maxima of these curves.

I would like to plot in 3D a solenoid toric in cylindrical coordinates. here is the system equation. Download 4968_Solenoid toric.doc
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I would like to plot this solenoid toric equation in maple 11 in this file Please replace this text with the link to your file. The link can be found in the File Manager

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).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 ?