I've just gotten started with maple (2 days ago). I needed to construct a set whose elements are vectors. During the generation of these vectors, there turn out to be duplicates and I was hoping that the set union operation will get rid of these. Instead, I end up with a set consisting of duplicated vectors. Here is a very simplified case that my problem boils down to: with(LinearAlgebra); a:=UnitVector(1,2); b:=UnitVector(1,2); #a and b are clearly equal. s:={a,b}; #s should be just the singleton set. But it gives s as being a 2 element set with this vector repeated.

While using Maple 10 at school I ran into an error when trying to plot a spacecurve within a 3D plot. When I enter: > A:=spacecurve([2*x,0,0],t=0..1); I get: A := PLOT3D(CURVES([[undefined,undefined,undefined],[undefined,undefined,undefined].. That take up half the screen. If I try to plot this, there is no curve on the plot, but I can see the axes. WinXP SP2 1024Mb RAM (I think) Nvidia Ti-4200

I want to ask about a small problem. I will present a paper at a conference in February. Because it involves time consuming calculations of numerical solutions for several onerous systems, I will do the calculations at home before the talk, save the results, and show the output to the conference. The folks attending the conference are not necessarily Maple Folks, so I do not want to have to explain the tilde after characters for which I have made assumptions. Of course, I know about

interface(showassumed=0);

After making the calculations here at home, traveling to the meeting, opening the file to make the presentation then, alas, the tildes are back again. Try this.

> assume(a, real):

> interface(showassumed=0):

> equa:=a^2+a-1;

Run this file. No tilde. Close the file saving the output. Open the file. There is the tilde after each “a".

My question:is there some way to make the tilde stay gone when I save such a file and reopen it without recalculation the worksheet?

Does anyone know how to use the Maple workheet "Mma" which is supposed to translate Mathematica notebooks into Maple? I got Mma from the Maple site (http://www.maplesoft.com/applications/app_center_view.aspx?AID=1483&CID=9&SCID=63) Is appears easy. Initialize the process with the commands interface(warnlevel=0): interface(displayprecision=4): with( MmaTranslator ): The give the tranlator the location of the Mathematica notebook with FromMmaNotebook( "C:/Notebooks/mmaSampler.nb" ); Even though I've checked the Matematica notebook for accuracy, All I ever get are error messages.

Hi all,
I'm a new user so...you'll forgive me if I've chosen the wrong forum. That's my problem: I've used Maple 10 3 or 4 times since the installation, but the last time I've tried to start it, the window was completely GRAY; after about a minute an error message appeared saying something about a 'peripheral error' and 'restart the computer to restore the system' (...sorry for bad translation from italian), the interesting thing is that the system has changed its graphical settings about the monitor resolution (800*600) and colors (I think 4 or 16). An other information... I noticed that a txt file was created just in that time and placed into maple directory: 'hs_err_pid1136.txt'; opening it you can read 'An unexpected exception has been detected in native code outside the VM.

Hi guys ;)
I have a question. Is it possible to apply a PID controller with the following parameters(P=6,I=4,D=0.02)to a Non Linear System described with the differentiate
equation like this
mk*diff(x(t),t,t)+kfv*diff(x(t),t)-(ki^2*u(t)^2*kc)/(mk*(x(t)-x10)^2)-mk*g=0
or in the second form, as two differentiate equations like
dx1 := (x1,x2) ->x2;
dx2 := (x1,x2) ->((u*ki)^2*kc)/(mk*(x1-x10)^2)-g*mk/mk-kfv*x2/mk;
without linearisation in operating point, where u - is input variable, x - position,
dx/dt - velocity, d^2x/dt - acceleration ?
Thanks for your help.

Delete a file or folder that I no longer want to retain.

Hi.
I have a transfer function like this one:
y:=(2.5)/((8*s^2+6*s+1)*s);
and I can make inverse Laplace transformation in time and plot it by:
y1:=invlaplace(y,s,t);
plot(y1,t=0..25);
I try it also with time delay in transfer function but it doesn`t work.
y:=(2.5*exp(-1.5*s))/((8*s^2+6*s+1)*s);
> y1:=invlaplace(y,s,t);
> plot(y1,t=0..25);
So i find a solution in differential equation and make an algorithm to convert transfer function to differential equation.
ode := 8*(diff(x(t), t, t))+6*(diff(x(t), t))+x(t) = 2.5*Heaviside(t-1.5);
ics := x(0) = 0, (D(x))(0) = 0;

Hi Maple's experts! I have two questions related to "iso-product" lines (in economics): 1. I draw the following graphs F:=plot3d( min(x,30*y), x=0..20, y=0..20): G:=plot3d( min(20*x,y), x=0..20, y=0..20): display({F,G}); a) How could I graph the contourlevels of the "combined" graphic of F and G? b) Obviously, the contourlevels are not convex.. it would be possible to "convexify" that?. 2. How could I do the same a) and b) if F:=plot3d( min(x,30*y), x=0..20, y=0..20): G:=plot3d( min(20*x,y), x=0..20, y=0..20): H:=plot3d( 3*(x*y)^(1/2), x=0..20, y=0..20); display({F,G,H});

I want to compile the appended code snippet from HelpExamples.c
into a DLL using MSVC6 and added C:\Programme\Maple10\extern\include
as well as C:\Programme\Maple10\bin.win as pathes to the project.
After compiling I get the following error message for linking:
Linking...
Creating library Release/MapleAPI.lib and object Release/MapleAPI.exp
MapleAPI.obj : error LNK2001: unresolved external symbol __imp__ToMapleString@8
It seems that i miss an import library - what should I do (except
having a break for some more coffee)?
Sh... upload does not work for 2 kB - exceeds maximum file size

I am trying to solve an equation and I receive this: "Error, (in fproc) unable to evaluate expression to hardware floats" Please help

Hello, is it possible to rotate a text so that it appears upside down or any other angle? Thank You very much! Corpuscowboy

My last question was answered so quickly, I thought I would try again:-) I am developing documents for my class in document mode. I want to be able to set the examples up so that if they change the example, then maple will update all of the subsequent calculations connected to it. I think I have that pretty well figured out. My problem is that the flow of the document is interrupted by the necessary maple commands to produce the required output. For example, I have the code "subs(x=-4,(4.2.3))" that is executed to give an equation. It shows the code and then the equation on the next line. I would like to hide the code.

Hello experts! I have the following problem. Considering the graphic: with(plots) p1:= contourplot( x*y, x=0..10, y=0..20, contours=20); p2:= contourplot((10-x)*(20-y)^2,, contours=20); display(p1,p2); How could I draw the line containing (all) the tangency points (of the curves of p1 and p2)? It would be possible to do that with Maple? Thanks in advance for your help, Jean Jacques.

I must be too far gone, my maple 10 will not agree with my TI-89. When I type sin(45) and press enter I get sin(45). Perfect! When I type sin(45.0) I get 0.8509035245 and I am expecting (.70710679). Now when I type cos(45) I get cos(45). Perfect! When I type sin(45.0) I get 0.5253219888 and I am expecting (.70710679). For sin(0) I get 0, but sin(90.0) I get (0.893???)when I am expecting 1.00. Likewise cos(0) I get a 1, but cos(90.0) I get (−.4480736161) when I am expect a zero. I promise that I am not on the sauce. Can anyone help straighten me out?