MaplePrimes Questions

Does anyone know how to create one in maple? please see the example attached..

Compute the coefficients of
> a:=`@@`(D,6)(u)^3; 
> b:=`@@`(D,5)(u)*`@@`(D,6)(u)*`@@`(D,7)(u);
#in the differential polynomial
> c:=`@@`(D,18)(u^3);.


Helppppppp :) TIA

Oops! you are right, thanks. How if the equations like these




where f1 and f2 are same as in the previous post.

The results are not explicit. How can we fix it?

Thanks again

I have two equations with weierstrass functions and got problem with fsolve: 




results are like Weierstrass (z1-z2,....) which are not simplified even I add 'simplify' in fsolve. I want the values of z1 and z2 explicitly, i.e. z1= ,z2 . How can I fix this. Please help.


Dear all,

I'm currently facing the following problem. I am trying to solve an expression for 4 variables: Fe11, Fe12, Fe21, Fe22. Actually these variables come from a 'deformation gradient tensor' Fe that is used in continuum mechanics.  This tensor actually appears in two equations in tensor-form. Since these tensorial equations contains 'inverse' and 'transpose' operators, the only thing I could think of to solve for a particular tensor (Fe), is to do this component-wise....

Is there a way to have filled or coloured regions in a polarplot?

I am just learning Maple, but have plotted several parametric curves.  However, the attached code is giving me an error message that seems to be saying that my indices for the two elements of the curve vector are out of range.  I don't see why.  Can you explain?

Here's the file:

Thanks for any help!

It's a simple question, but I could not find a hint in the help system.

In economics it is very common to name variables like Y*, π* etc. They are unique, e.g. Y* ≠ Y

How can I enter them? If I just do it, it is interpreted as a vector function.

From time to time, you even need variables that have an overline (or bar),  above the character in addition to the asterisk, or variables like Â*.

A similar problem are variables that are named y' ...

piecewise not suitable to sum:

H:=proc(y,a,b) y+piecewise((y>0), a,b); end proc;
Error, (in intrep/StatSeq) invalid terms in sum: if 0 < y then a else b end if

Any walkarounds?



I have 2 functions here and I want to study their graphic. I never used Maple for that kind of things but this is probably the fastest and more precise way to see what happens graphically when it comes to those functions:


y1(t) = -rDirac(t) + t^2* summation (from n=0 to infinite) (r^(2n-1) * Dirac(t-2*n*Tau))


y2(t) = t^2* summation (from n=1 to infinite) (r^2n*Dirac(t-(2n+1)*Tau)


Hello. I need to solve a problem where:

  A is defined over a real inteval [c...d]   and   B is defined over another real interval [d....e]. 

I want maple  to take max(A,B) and tell me which interval is larger( asume no intersection)

For example

A=[0....1] and B=[2...3]

Answer should be max(A,B)=B

Thank you

For given expression expr it's known that  type(expr, function) returns true. How to grab name of that function in fast way?

Unserstood that in slow way could be transform to string done and after that could be found substring till 1st '(' symbol. But i'm sure that name somewhere 'sits' directly.

After understanding how one part of code works i also see that it uses trick of eval (namely "procedural substitution"):

r:=f(g(u), h(w)):
eval(r, [g=proc() ll; end proc]):

gets full substitution with arguments


r:=f(g(u), h(w)):
eval(r, [g=ll]):

do simple one 'by name'.

Where can i read about that?

If you look at Maple help on Grid[Launch] command there is an example of checking the prime numbers.

I do not understand why the timingData variable is empty after specifying it in exports parameter.

When I do not specify it in the exports parameter, the timingData variable has the same value as it had before calling Launch command.


can you help me, I want to make a convolution on this :

 But I really do not know how to deal with the diff...



Sorry for my english

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