Hello,

I am quite new to Maple and require some help on vector calculus. I have a differential operator in matrix form C that has to be applied to a column vector B.

C = [d/dx   0    d/dy]

      [0     d/dy  d/dx]  

and

B = [

Dear friends, I encounter the following problem. Let k and i be two given positive integers such that k>=2i>=4. How to find all nonnegative integers tuples (x_1, x_2, ..., x_i) such that k-2i<=x_1+2x_2+...+ix_i<=k-i? The buildin command "isolve" seems not work. Thanks.

@Markiyan Hirnyk 

Dear sir i have worked with the command

>plot(log(-1+exp(t)),t=0..2*Pi);

i got plot.

When i replced the argument by complex variable t ->i*θ

i got the same message.

Warning, unable to evaluate the function to numeric values in the region; see the plotting command's help page...

Hi

I am a PhD scholar at the University of Queensland. I am reviweing a paper titled as "A similarity solution for laminar thermal boundary layer over a flat plate with a convective surface boundary condition"(the pdf is available online). In this paper the author has written a MAPLE code. I copied the same code in MAPLE but could nt succedded. The author used the Runge Kutta RK5 Method to solve the model.

Please help me to solve the same model...

Hello every body

I wrote a program and i need to inverse a matrix but i get "error (in linear algebra:- matrix inverse)" singular matrix

can you help me to do that. the matrix is:

Matrix([[1.0000, 0.7056, 0.7965, 0.6928, 0.5941, 0.5169], [0.7056, 1.0000, 0.5653, 0.6449, 0.4601, 0.4376], [0.7965, 0.5653, 1.0000, 0.5521, 0.5526, 0.4153], [0.6928, 0.6449, 0.5521, 1.0000, 0.4271, 0.4242], [0.5941, 0.4601, 0.5526, 0.4271, 1.0000, 0.2999], [0.5169, 0.4376, 0.4153, 0.4242, 0.2999, 1.0000]])

I am trying to learn to use the Physics Package.

There is also a tensor package. Do this packages work together?

I tried some examples from a mechanics book:

For a stresstensor the stessvector on a plane defined by its normal should be calculated.

I made it in the following way:

restart:with(Physics[Vectors]):
sigma[i,j]:=Matrix([[ 54 , -27 , 9 ],
        [ -27 , 18 , 0 ],

... is finance.dll missing in Maple16 (64 bit), as it was in Maple15 (64 bit), so you have to install the 32 bit version instead?

Is it possible to move the finance.dll-file from Maple16(32-bit) to Maple16(64-bit)?

Jestrup

Hi there,

I've written a maple worksheet file (*.mw) that does some long calculation and got a result.

If it matters, the result is a 3X3 matrix with different parameters (not only numbers). 

So far so good. 

I want to use this result in another maple worksheet file.

Can I import only the result by somehow referancing the filename and equation number in that file?

Just...

how to plot log(-1+e^t) t=0..2*Pi

Hi.

I writing a code with using matlab package.

when i using "setvar" maple is showing the folloeing error:

"Error, (in Matlab:-openlink) Can,t find matlab's Engine library, libeng.dll. windows reported"

but this dll is in matlab directory,

i,m using, win 7, 64 bit, matlab 2009b 64bit, maple 14.

Hey,

Is there a way of searching a list for two consecutive numbers?

Eg. I have the sequence:

Hi!

I've got this annoying problem and it's quite simple reproducible.

> with(GraphTheory): G := Graph({{a, b}, {b, c}, {c, d}}); Edges(G);

Edges(G) returns me

Error, (in EdgesExt) external library libgraphtheory.so could not be found/used

 

It's the first time I encounter such a problem and have no idea on how to solve it, any advice?

I can see that libgraphtheory.so...

Hi, all. The problem is following. I have an ODE where right hand side is an integral function. For simplicity consider the following example:

with(DETools);

f:=q->int(exp(cos(s)), s=0..q);

DEplot({diff(x(t), t) = f(t)}, [x(t)], t = 0 .. 1, [[x(0) = 1]]);

this code doesn't work:

Error, (in DEtools/DEplot/CheckDE) extra unknowns found: s

In a related question to this answer (http://www.mapleprimes.com/questions/129140-Surface-Fitting#comment129195). How can we take partial derivatives of the multivariable fitting function (in the example above, the function B(a,b)?
It seems like the package CurveFitting only allows to numerically evaluate the fitted function when we use ArrayInterpolation, but I assume deep in the code there must be an analytic ...

I try to write sqrt(4) so that it will not be calculated to 2. I typed uneval(sqrt(4)) and received sqrt('4'). I do not want quotes surrounded number 4. How can I suppress it? Is there another way to write sqrt(4) without calculation to 2?