I want to call a GSL function, which writes data to a pointer to be provided
(Regular Spherical Bessel Functions, array version) it has prototype

  int gsl_sf_bessel_jl_steed_array (int lmax, double x, double * jl_x_array)

so the 'array' is a pointer and no specific length (though only lmax + 1 of
the space is used, I think).

I tried the below, but the actual call results in a crash:

  arrB_GSL := define_external(
    'gsl_sf_bessel_jl_steed_array',
   ...

f(x) = (a((ax+b)/(cx-a))+b)/(c((ax+b)/(cx-a))-a)

The homework assignment asked me to simplify this function. It turns out that I was able to simplify it all the way down to f(x) = x by hand. However, I cannot seem to get Maple to simplify it any further than the original problem. Any ideas? Thanks, Brandon

when a student or colleague attaches a .mw file to an e-mail....i have trouble opening it....when i try to i get this question "How do you want to open this text file?" with four options "Maple Text", "Plaintext," "Maple Input" and "Cancel".  it does not matter what I enter here....the worksheet appears empty.

i do not have any problem with .mws files as e-mail attachments.

pwh

Hello,

I am trying to solve numerically the following equation :

Eq:={diff(u(x,t),t$2)-0.1*diff(u(x,t),x$2)+0.00001*diff(u(x,t),x$4)+0.1*diff(u(x,t),t$3)=0};

Here is my code :

restart;with(plots): with(PDEtools):

Eq:={diff(u(x,t),t$2)-0.1*diff(u(x,t),x$2)+0.00001*diff(u(x,t),x$4)+0.1*diff(u(x,t),t$3)=0};

BC:={u(0,t)=0,u(1,t)=0,D[1](u)(0,t)=0,D[1](u)(1,t)=0};

I will really appreciate some help with assigning solutions of the solve command to names. For example, when I enter the command...

solve( [3x + 9y=10,8x-7y=20],[x,y])

 

I get the following output:

 

[[x=250/93, y=20/93]]

 

How can I extract the solutions and assign them to x and y which I want to use in subsequent calculations such as ...

 

sin(x) + sqrt (y)

 

Hi all,

I am solving a system of ODEs numerically, and then plotting the results over time. I would really like Maple to show me the equation behind the plotted graphs. Through my searches I have not been able to find the code for that. Any help would be greatly appreciated. For example, how do I see the equation for W(t)?

sol1a := dsolve([Eq1a, Eq2a, Eq3a, H(0) = 4879, W(0) = 105000, R(0) = 0], numeric, method = rosenbrock, output = listprocedure)

plots[odeplot](sol1a, [t, W(t)], t = 0 .. 40, color = blue, style = point);

Hi!

I have a system of equations like this:

and I wrote this equations into maple in this way:

eqns := [diff(x(t), t) = -x(t)-y(t), diff(y(t), t) = x(t)+.25*y(t)+r(t), diff(z(t), t) = 3+x(t)*z(t), diff(r(t), t) = .5*z(t)+0.5e-1*r]

using DEplot3d I tried to drawing attractor diagram:

Learn how to evaluate Double Integrals over General Regions that are not rectangles. The example in the attached worksheet graphs the region's bounding functions. It then articulates two methods for forming and evaluating an iterated double integral to find the area of the region. Watch the Double Integrals over General Regions - Video Tutorial (Ctrl + click) to

I'm running OS X 15.5 and have just installed Maple 12. I cannot figure out how to get this thing to launch. If I attempt to launch Maple from the surface in the applications folder, the Maple icon bounces once on my desktop and then -poof-, it disappears.

 

I have also tried running it from the command line thus and received a permissions error:

dhcp0918:~ emcdowell$ /Library/Frameworks/Maple.framework/Versions/12/bin/maple
-bash: /Library/Frameworks/Maple.framework/Versions/12/bin/maple: Permission denied

and have also tried this:

I use Maple 12 on a Macintosh platform. When I press command+ t   I switch to text mode. How do I switch back to 2D math input using the keyboard? Thanks in advance !!

In a previous post I described how to call OpenMaple from a C# application (see: Using OpenMaple with C#) Now, I'd like to tackle the reverse problem: how do I call a C# .dll from within Maple? The way to do this involves using Component Object Model (COM) interoperability in the Microsoft .NET Framework. Because Maple's kernel is written in an "unmanaged" language, a wrapper is needed in order to bridge to your managed C# code. This article will outline the steps needed to create this bridge and get Maple talking to C#.

Hello everyone,

In plotting a function with discontinuities such as y = tan(x), I know that using the plot options "discont=true, scaling=constrained" allows for normal plotting with vertical asymptotes.  But how do I do with with plotting a curve given by parametric equations?  My curve has a skewed symptote and I can't get my plot to show this.  It just "blows up" and the scaling goes to infinity.  

 

Thank you, anyone, for your help.

 

        David

Hello All, I read some other posts on "stack limits" and they were not too helpful. In a particular case there seemed to be a bug, as stated by a Maple kernel developer, but I can't imagine that being the problem here. I have a MacBook Pro (Intel) using Maple 11.02 with 2GB of RAM. The following code displays the stacklimit eror causing a failure with the kernel connection whenever I try to simplify the last line. Does anyone have any ideas? Thanks much, Steve. P.S. Here is the worksheet lines: restart one := 1/((x*Dd-x^2*Dcj)*sqrt(x^2-1))

I have two column matrices that I have imported into Maple from Excel (an 'x' and 'y' matrix). The algorithm I am using (that attempts to fit a circle to the data) requires the points to be in an array of the following format:

pts:=[[x1,y1],[x2,y2]...];

How can I run a loop, or other application, to pair the respective pointsto each other in an array such as the one above?

Thanks for any help.