## cubing a 1.5 million digit string...

Hello, I have a 1.5 million digit string and would like to cube it. I believe I have succeeded in reading the text file, but don't quite have the language right for manipulating and sending back to text. Thanks in advance, Dan

## Creating a diagonal matrix with values from a vect...

Suppose we have a column vector B of n elements. Whats the simplest code for creating n x n Matrix A whose off diagonal elements are 0 and whose diagonal elements are the elements of B?

## Output numerical data from a Maplet?...

I have developed a Maplet tutorial in which the output of the Maplet Evaluate is an X-Y plot displayed using the Maplet Plotter element. I would also like the Maplet to display the numerical X-Y data in a format that would allow the students to simply copy and paste the data directly into an Excel document so that they can carry out additional analysis of the data. Any suggestions?

## fprintf help...

Hi, I'm trying to get maple to output the numerical answer, from a call to dsolve, to an external txt file; but I'm having a bit of trouble. I want to do this so that I may then plot the results in an external program like easy-plot, or just analyse them. I'm using a "read" command in Maple to read in a procedure from a txt file (shown below), which I then execute in Maple: #Utilise prime notation for derivatives wrt t: with(PDEtools, declare): with(plots): declare(y(t), prime=t, quiet): #Also shorten output notation: alias(y=y(t),y0=y(0),yp0=D(y)(0)): #define the ODE: ODE:=diff(y,[t\$2])-(1-y^2)*diff(y,t)+y=0;

## Getting Maple 10 to show the commands executed...

When using Maple 10's clickable capabilities one easily gets the results requested. However at the end of a long session the user has a long list of generated results , but it is not easy to recall what was done. Is there a way to find out what commands are hidden behind the right arrows that precede the results shown? For example: If my worksheet shows x^2 -> 2x, is there a way for me to have Maple produce x^2; diff(x^2,x); (or similar) which shows I took the derivative of the expression with respect to x. Thanks in advance. Tom

## Setting the number of digits displayed...

> > ## Retaining function descriptions after restart...

I was surprised to find MAPLE doesn't see to have the Kronecker delta as a system function. It was simple enough to write one, but that brings up a question. What if you have certain simple functions which you want to have always available, even after a restart. If you do restarts alot, it can become tedious to keep having to go back to the execution group in which they are defined and click on it. Is there any way to define a function as 'Permanent'. I'm just starting to read about modules. Is the use of modules a recommended way to have user defined procedures stay in the system af

## Maple 10 (64 bit) installation problems...

Hi!!! i am trying to install maple (64 bit version) on ubuntu(dapper drake) 64 bit version with libc version 2.3.6. When i try to run the installer, I am getting the following errors: nawk: error while loading shared libraries: libdl.so.2: cannot open shared object file: No such file or directory dirname: error while loading shared libraries: libc.so.6: cannot open shared object file: No such file or directory /bin/ls: error while loading shared libraries: librt.so.1: cannot open shared object file: No such file or directory basename: error while loading shared libraries: libc.so.6: cannot open shared object file: No such file or directory

## ODE-25 Reactions...

Download 569_ODE-25 Reactions.doc Hi, I want to solve 25 set of differential equation for unknown variable and contants. Problem Statement: Solve the following set of differential equations for concentrations terms in terms of CA0 and t CA, CB, CC, CD, CE, CF, CG, CH, CI, CJ, CK, CL, CM, CN, CP are the variables and k1 to k25 and CAO are constants Initial Values: t=0 CA=CA0 and CB=CC=CD=CE=CF=CG=CH=CI=CJ=CK=CL=CM=CN=CP =0 How do I proceed for the same? Regards, Bikash

## Unit step function OOPs.. question is incomplete...

Hi,

The two functions, they were cut off in the original post, are:

f:=sin(3*t) (0 < t < Pi)

and the second function is:

f:=cos(Pi*t) (1 < t < 4)

Set up using unit step functions and graph the functions.
Function is 0 outside the given interval.

I have searched the Net, Application Center and Maple(10) manuals and am stuck as to how to write these solution with Maple(10) Commands.

Any help/tips will be greatly appreciated.

TIA

Larry Ciak

## Unit Step & 2nd shiftting Theorem...

Given the following information: f:=sin(3*(t)) (0 <><><>

## I know this is a stupid mistake...

I am currently working on a project with Maple, and I am stumped beyond belief. The first I have been working on for something like two weeks now. I have worked on it with the university computers, and my own computer and recieved the exact same error. I don't see any syntax errors, and apparently the TA has been able to get his to work. So could someone possibly point out my stupid mistake? ``` f1:= (2*x(c-Pi/2))/sqrt(1-sin(c)); fint:= int(f1, x=0..1); limit(fint,c=(Pi/2), right); ``` And it outputs the following: `signum(int(2*x(0)*sqrt(2), x = 0 .. 1))*infinity`

## restart...

If the finite field is Zp (p a prime) then it's easy. But what if the field is say, GF(2,3,x^3+x+1)? Suppose, for example, I entered: ``` r:=rand(8): G:=GF(2,3,x^3+x+1): M:=Matrix(3,3,(i,j)->G[ConvertIn](x^r())); ``` How would I invert M (over the field G); multiply M by another matrix, and so on? Can I do this with the Domains package? Thanks, Alasdair