## fast integer dot product ?...

What is the fastest code for integer dot product in Maple ? I am currently using the inner command, however there seems to be a lot of overhead. It is easily slaughtered by GMP. I was wondering if there is a dedicated external routine or something else that I can call ? I want to avoid linking in a C library just for this. On a related note, I think Maplesoft should develop a companion to the LinearAlgebra:-Modular package that supports fast operations with dense integer matrices in compiled code. I know the LinBox library supports this, maybe it could be linked in ? I actually don't

## Why is my procedure refusing to accept that this v...

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

## Plot a projection...

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

## assign/unassign...

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?

## Evaluate then assign as function...

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

## "Error Handling" Message from .qu Converter...

I am having a lot of trouble converting my LaTeX files to .qu with a wide variety of problems. The first one is a successful conversion but instead of an [OK] I get the message "Error Handling". LaTeX3.qu: Error handling In being fed up with the converter, I added questions and converted them one at a time. The problem is with this particular question, text below: Download 5024_LaTeX3.tex
View file details

## Non-commutative algebra...

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

## Clarification on Plot Builder input...

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

## Error Bars...

Can Maple produce plots of data with error bars ?

## Points...

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

## Precision...

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?

## Help with plotting...

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.