plot3d(x^2+y^2+2*x, x = 0 .. 3, y = sqrt(4-x^2) .. sqrt(9-x^2))

It will only plot as far as x = 2, except for one line.  Maybe because sqrt(4-x^2) is undefined for x > 2?

How can I plot over an annular region?

I have a procedure that gets two lists A and B, I want to restore the name of the entry lists as string. How can I do that?

f(A,B) [procedure]

e.g. a(MyList,LL)

I want to restore a:="MyList" and b="LL"

TIA

Hey guys,

Really struggling with computing an algorithm on maple for the Stable Marriage Problem? Would be so appreciative for any help. Thanks Claudio

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

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

Helppppppp :) TIA

This is the Affine Scaling Algorithm outlined by:

Linear and nonlinear programming with Maple: an interactive, applications ...
Paul E. Fishback,Paul F. Fishback

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

f1:=WeierstassZeta(z1-z2,0.1,2.)+z1=0:

f2:=WeierstrassZeta(z2-z1,0.1,2.)+z2=0:

fsolve({f1,f2});

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.

Thanks

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:  NewtonLeastResistanc.mw

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:

restart;
with(codegen):
H:=proc(y,a,b) y+piecewise((y>0), a,b); end proc;
prep2trans(H);
Error, (in intrep/StatSeq) invalid terms in sum: if 0 < y then a else b end if

Any walkarounds?

Wide set of expressions can convert to compiled functions. Expressions can even include definite integrals.
Hope it helps for others who want really speedup calculations in maple as much as possible for now.

ex.mw

Checked under 15.01 version

My daughter the psychiatrist recently shared a link with me that mentioned a factoid about Facebook: "84 per cent of people think their friends have more friends than they do".  Actually they don't just think this: for 84 percent of Facebook users, the median friend count of their friends is higher than their own friend count, according to

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.