## Eliminating variables from a set of equations...

First time posting here, hoping to find some help, and I may try to help others. I have a set of 8 equations. Each of the 8 equations are in terms of two variables. For example: x1 = f1(theta1, theta2) x2 = f2(theta1, theta2) x3 = f3(theta1, theta2) x4 = f4(theta1, theta2) y1 = f5(theta1, theta2) y2 = f6(theta1, theta2) y3 = f7(theta1, theta2) y4 = f8(theta1, theta2) the functions f_j are not neccesarily linear and are fairly complicated with many factors. I need to remove (eliminate) the theta1 and theta2 terms from the set and be left with a new set of equations that is in terms of x_i and y_i.

## How to coding such kind of function (Convolution)?...

Hi all: I want to realize the following function in maple: 1> According to the input vector, n, canculate the n times of auto-convolutions, after getting the final result, measuring the vector according to each element of the result. If I use the math language, Suppose I have vector, called A the length of vector is L; Result = A*A*....A (n times convolution); Measure= Sum (on i) (Result[i]*ln(Result[i]); I donot know how to coding like that Thanks for any help. How to read the parameters from keyboard in maple? Thanks bin

## Maple output...

I am trying to compute some Lie brackets in Maple but am having trouble with the output. The first five few terms that I computed are small enough that they will display with pretty print. However, the sixth term gave me the error 'Large output of more than 1000000 nodes' and it couldn't display. I turned pretty print off and eventually got it to display the sixth term but now I can't get the seventh or eighth terms to display even with pretty print off. Every time I try to output the expression for the seventh or eighth Lie bracket Maple just stalls out. Since it can compute the terms that I need but not display them is there a way I can export the hidden content to a text file or some other format so I can copy and paste the equations into Matlab?

## Plot into a data file...

Hello everybody: I need to know how to export or create a plot directly into a data file (i. e. .dat or .csv) to pick it up with Origin or something like that. Thanks, L.

## Printing Output and Proc...

Using the proc command and multiple functions embedded in a main function, I'm trying to calculate something. However, I don't want a huge list of calculations to be printed out. I realize that using : instead of ; eliminates most of those outputs, and I've set printlevel := 0;, but I am still getting printouts every time I run an embedded proc inside my main calculations. I was hoping there would be a way to make it so nothing is printed out at all excluding the final return value of the main function (specifically, how do I eliminate the output of the embedded proc's). Thanks, William

## System of ODEs...I have a problem......

Hi I have a problem in solving a system of odes with maple,here is a capture(jpg) of my program in maple, http://beta.mapleprimes.com/files/1709_sysode.JPG how can I solve that error? Tanx.

## Some Questions Relating to Working with ODE's...

I had three questions, but two were about series solutions to linear ode's, and I just discovered the wonderful Slode package...I learn something new about Maple every single day! I still have one question though... In the help page for the laplace command in the inttrans package, it is indicated that, when transforming ordinary differential equations, initial values can be set and incorporated into the transform, but I haven't figured out exactly how to do this, and I didn't find anything else on the help page. Thanks a lot for any suggestions!

## axes on 2D plot...

I would like to have labeled axes on all four sides of my 2D plot. I can get them on the right and bottom using axes=normal. I can also get them on the left and bottom using axes=boxed or axes=framed. But I can't get the axes on the top of the plot to show up. Any suggestions?

## Matrix - gcd, lcm...

Hello, I have a matrix (not Matrix) say A = [D+D^2 D^2 D ] [ ] [1 (D+D^2)/(1+D) D/(1+D)] I want to form a matrix B from A such that i_th row of B = i_th row of A * (lcm(i_th row of A) / gcd(i_th row of A) ) How can I get this done ? Regards, Iyer

## grobner in a non commutrative ring...

I want to solve an algebraic system in a non commutative ring: for example {x1+x2+x3=a,x1^2+x2^2+x3^2=b,x1^3+x2^3+x3^3=c}. Can I find a Grobner basis with Maple 10 or with another software (under windows)?????? Thanks.

## ARROWS on a plot...

I know how to make my linestyle into DASH, DASHDOT, etc. But I am trying to an ARROw along my curve. Does anyone know how to achieve this? I have several solution curves to an ODE on the same plot, and they all converge to one line. I would like to have arrows on each of the curves to show that they all converge into this one curve. Any help is appreciated.

## Help with Unable to Parse??

by: Maple
handtotal:=proc(hand::list) local total; global Cardvalues; total := 0; total := sum('Cardvalues[hand[k]]', 'k' = 1..nops(hand)); if(is_an_ace(hand)) then (unable to parse)if(total + 10

## polynomialinterpolation giving different results s...

intf12 := CurveFitting[PolynomialInterpolation](testfile[1..-1,1..2],z): eval(intf12, z=1); 54 0.1211007603 10 intf12 := CurveFitting[PolynomialInterpolation](testfile[1..-1,1..2],x): eval(intf12, x=1); 53 0.8 10 The only thing I changed was the variable from 'z' to 'x' I tried other names and they also gave me different answers once I evaluated. Is this a bug, known or unknown? Why would simply changing the variable name change the resulting equation?

## optimization, differences of data types

by: Maple
I've been learning Maple 9.5 for a week now. There are many data types, and they each have their differences in functionality. I came across an article that mentioned that lists and sets make copies of the data for each manipulation, therefore aren't the best choices with that in mind. My questions is essentially: What are the subtleties of the different data types in speed and memory etc...? Which seem to work better is which situations? considering that we all want our code to be done now and take up no memeory :>) thanks James