Maple Questions and Posts

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I am running Maple 11 on Mac OS 10.5, and so I use the older Java Runtime Engine to get decent looking prints. However, whenever I print something using pointplot, all the points have this anti-aliasing that makes it look really bad, especially if you use something a little thicker like the diamonds.

I attached a pdf of a printout of a recent homework I did plotting out the Lorenz attractor using pointplot. I noticed that the 3D version at the end looks okay, but the 2D projections I did show you what the problem is. If you zoom in you can see the "shadows"

Is there a way to get all your printouts entirely in vector format?





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When I solve the equation

ode := diff(y(x), x, x) = t*y(x)+1



everything is ok,

y(x) = exp(sqrt(t)*x)*_C2+exp(-sqrt(t)*x)*_C1-1/t

However, when I want to solve the system

Is there a way to ask Maple to kindly do this for me?  Perhaps if there is can the kind sir show me the steps?


How about something simple, r=sin(theta)-Pi.


I ask because I did this one by hand and maple would not implicitily plot it for me!




when i pass a pair of differential equations from a procedure (called expressions in the code below) to another procedure (main) I am unable to solve the equations with dsolve.

If I explicity include the equations in main I can solve it fine.

Does anyone know what I'm doing wrong?

please help!

below is the code that 1) doesnt work 2)does work

I want to plot the complex numbers

(-1/2)^q+(-1/2)^(1-q)  (0.25<=q<=0.5)

on the complex plane. Does exist a package (some commands) which can do it?


there are n persons selected at random. the probability that at least two of them are born in the same day is p(n). i have to calculate:

a))   p(2),p(3),p(4)

b)) to establish a formula for p(n)

c)) to find out the values for "n" so that p(n)>0.5

if anyone can help me i would be forever grateful. i don't have no idea for this type of problem!


Hi guys

How do you calculate the tensor product of 2 matrices in maple? Can't seem to find this simple operation in the tensor library.

I'm new to Vista, and I'm trying to get a network copy of Maple 11 to load correctly. I've read about the open/save problem, so I tried to run the install file as administrator under Windows 2000 compatibility mode, but the installation wouldn't finish properly, so I installed normally. Opening normally, Maple now runs fine except for the open/save problem. Opening as administrator andd under Windows 2000 compatibility mode, the program stops working before it finishes loading. I don't know what to do, I need this program for class. Please help.

how do i solve a matrix ^ 10?

thank you

Actually, I could just cut to the chase here...

I need to print out a 2-D ring and then attach that to a 3-D sphere.  The problem is that the 2-D ring will buckle as I attempt to attach the outer circumference of it to the sphere.


I have problem with define external function with dll written in Visual Basic.

Declaration of function is


This problem arised in a math forum.

I would like to check wether the consecutive digits of a given positive integer (n) are in the first 100000 digits of Pi.

For example the given integer (n) = 1592653 and this is in 3,1415926535897.... so the result is true.

I also would like to use this pattern matching for checking the type of a variable in a procedure:

...end proc;

The procedure accepts n if n fullfils the condition above.

As Demmel and others have noted, SVD is both more reliable and more expensive than QR as a method of solving rank-deficient least squares problems.

SVD is the method that LinearAlgebra:-LeastSquares will choose when the Matrix has more columns than rows (n>m), unless instructed otherwise using the optional 'method' parameter.

LinearAlgebra:-SingularValues always computes a full U and Vt. But for least squares computations, such as when n>m, this is not necessary. Including the smaller singular values may just be (re-)introducing noise. See here for more detail.

Here's a 20x2000 example, using wrapperless external calling and the SVD routine dgesvd in the CLAPACK library. The effective speedup by using the Thin SVD for that 20x2000 least squares example is about a factor of 100 (ie, 2000/20), with a similar reduction in additional memory allocation.

I have found this problem somewhere in a math forum: somebody wanted to simplify this expression ( I write it in maple syntax:, this was not a maple forum):


They tried with the simplify command of maple, but it didn't work, and they tried with Fullsimplify command of the other famous math program , and it worked. ( I haven't tried it.) The conclusion was that Maple couldn't do this job.

Actually Maple can do this job with radnormal:



I am having problems using implicitplot.  I run this code and it worked and today I tried it again and it gives me the following:


implicitplot(0=int(erf(  (T-e*t)/sqrt(2)  )*t^2*exp(-t/2),t=0..infinity),e=0..1,T=0..10);

Error, (in plots/implicitplot) invalid input: the following extra unknowns were found in the input expression: {t}

The weird thing is that this worked before (took about 10min though) and now it isn't.  Any suggestions?



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