Hi all, Did you discover the same mysterious thing about the command execution time in Maple? Here is my observation: If I have been using this session for a long time and then if I issue a long-processing command, such as simplification of a very complicated expression, etc. After a while, Maple will get into "steady state": it keeps running and running, without consuming more memory and showing more activity, the time even counts towards 10000 second, etc. If based on this, I think the expression is really too complicated for it to simplify, then I am wrong. After rebooting the PC, and relaunch Maple, and start the same command to simplify the same expression, it generated a result within 15 minutes, successfully...

How can I make maple read data from file.dat and fit it in a nonlinearfit.thanks.R

A little under two years ago, I started working on a little project we have here at NCSU. I should perhaps devote another blog entry to discussing that lovely little project... Anyway, there's a lot of Maple code in this project (as it is based in Maple), and I've had to untangle and understand what multiple programmers have done over the years. Last year, I came across one piece of code that I thought was exploiting a bug in Maple: We would take a long string of commands and parse the entire string with a single parse() command. I could never get a Maple worksheet to reproduce those results obtained from piping the command into Maple from the command line. Weird, no?

For each of the definitions

p := proc( x :: float ) :: float; x^(2/3) end proc:
p := proc( x :: float ) :: float; x^evalf((2/3)) end proc:

i get an error by calling Compiler:-Compile( p ):

"Error, (in printtab[CodeGeneration:-Names:-Rational])
rational numbers and arithmetic are not yet supported"

Any suggestions what to do (except manually converting
all exponents to floats)?

Edited to add: for example the following does not work:

c := proc (S::float,...

What's wrong with my "asympt"? Hi all, I want to find out the order of growth/decay of expression CCP1(attached below). CCP1 is a sub-expression of my huge expression(which Maple couldn't handle). The goal is to find the functional form for my expression as "v" and "t" approaches +infinity, so that I can bound the error after truncating it, because I am using this as an integrand. The original huge expression is known to be fast decay in "v" -- I suspect the asympotic order is of exp(-a*v)/(v+b)^n. But this sub-expression might be decay, it may grow at +infinity. The goal is to find out the asymptotic order of growth/decay so that when I combine with the results from other expressions I can get the overall decay order.

I have been trying to solve the following differential equation with 2 starting conditions. (It's the equation of a mechanical vibration). >diff(x(t), t, t)+4*Pi^2*x(t) = 200*sin(hoekvers*t) beginvw:=x(0)=5,D(x)(0)=0; The result: >Opl:=dsolve({DV,beginvw},x(t)); >Opl:=x(t) = -100*sin(2*Pi*t)*hoekvers/(Pi*(4*Pi^2-hoekvers^2))+5*cos(2*Pi*t)+200*sin(hoekvers*t)/(4*Pi^2-hoekvers^2) Now I want to plot the graphic of this vibration when hoekvers=2*Pi. (In that case there is resonance) I get the error dived by zero. As you see the numer is zero when I fill in 2*Pi. For 2*Pi+0.000000000001 I get no error and a good graphic but this is not a good and exact method according to me.

Is there any way that I can get MAPLE to check through an ordered set and return the first integer value? So if the set were; {2,x,h} it would return 2 {r,h,x} it would return () {3,4,5} it would return 3

Waterloo Region, where our head office is located, has been called "The Quilt Capital of Canada". So a couple of years ago, I'd created a worksheet to generate a traditional "Log Cabin" quilt. I've made some minor updates to the example and added a "Trip Around the World Quilt". Having made a few quilts by hand myself, I can definitely say that it's easier to create a Maple one!

Is there a way to save results to file instead of the console/display? My expressions got too long and they occupy huge space on screen and scrolling is horrible now. Of course I can hide the content of the display by using ":". However, I do need to use(copy & paste to other applications) the very last output of results(it is very long). Is there a way to specify or redirect the output to file so after a while I just need to open the output file to use that long expression? Thanks a lot!

Is there a way to find out the rate of decay of function f(x) when x-> +infinity? Hi all, I just wanted to use this real-world engineering problem to practice problem-solving using Maple. Suppose I have a function f(x) (probably complex valued), how to find out its rate of decay as x approaches +infinity? I used "limit" but it will give me a value, not a functional form. I already knew my function has a limit =0 at x=+infinity. And it is of fast decay. I would like to bound the limiting behavior of f(x) by exp(-alpha*x) for some suitable constant alpha. Is there a way to handle this in Maple?

I would like to set up library(s) of routines that can be accessed as part of MapleNet applications. MapleNet applications are prevented from doing file i/o unless you specifically "unprotect" your server. Is there a way to set up libraries on my web server to safely get around it? Or is there a way to include my library routines while I'm building my maplet application, without copying and pasting in the source?

I am using Maple since a year and I am used to work in the classic worksheet. Now I wanted to try out the regular worksheet (you also have document mode). This worksheet is completly different from the classic one. By example I can not find a way to insert text in that worksheet. I click 'text' (F5) then 'Maple Input' is highlighted. I change it to 'text' and type some text. I press enter and ' ";" is missing ' is displayed. This is just text not a Maple command... How can I let this sheet now I only want to insert text? Thanks in advance, Pieter

Is it possible to stop a section in maple 10 classic worksheet expanding on execution? I see from past postings that you cannot lock the section but I just want to keep it closed. I only want to see the final results on execution and I have to scroll past all the expanded sections all or click on all the sections to close them thanks

Hi, I am new to Maple and am having trouble with what should be a simple task. I have a series of simultaneoous equations of the form a*x+b*y=c etc. I have found an initial equilibrium by choosing values of x and y which give me reasonable values of a and b (using the Solve command I have output of a,b,c,x,y which satisfy my equations). Now, I need to use the parameters I have, my a,b,c, to try and retrieve my x and y (my real aim in this is to see the effect on the x,y when I change the a,b,c). When I try and put the equations plus parameter values into Solve it takes a very long time to solve (I stop after 20mins). What I want to do is use the equilibrium values I obtained before to give Maple a starting point to search for a solution.

Hi Folks, Here is a numerical integration program: http://people.scs.fsu.edu/~burkardt/f_src/quadpack/quadpack.f90 In evaluating the integrand functions, it is good to do two function evaluations at the same time simultaneously. I just found that I have two CPUs Pentium Xeon 2.4GHz, each supporing only up to SSE2. Although the CPUs are slow, but if I can utilize them to do parallel computing of the numerical integration. It would be great! But I am not a Fortran expert, nor am I a CS major... Could anybody give some easy-to-follow advice on how to make that code parallel on two CPUs?