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11 years, 225 days

plot3d on triangular domain...

Hi!

i'd be glad to get some help with that problem:

i want to do a plot3d of serveral functions depending on x1, x2.

My problem is the that I need it to be plotted on a triangular domain. i.e. the triangle limited by the edges (0,0), (0,1), (1,1).

I tried the following:

p[i]:= plot(phiX1[i](x1,x2),x1=x2..1-x2,x2=0.. 1);

and received:

Error, (in plot) expecting a real constant as range endpoint but received x2

Small Problem with unapply...

Maple

Hi!

i have a short question. It should be easy to answer.

I use unapply which works fine but it seems as it doesn't save the result. If i call  Phi := unapply(A1[1], x1, x2); this gives me: (x1, x2) -> 1 - x1 -  x2 (the function I expected)

but when i call "Phi" it just gives me the symbol for Phi and not the function. Maple uses the symbol for following calculations.
...

linalg commands seem not to be executed...

Maple

Hi!

I have to maple worksheets: one called test.mw and another called wholecode.mw. I read a file with

read(filename); from both .mw sheets.

but then test.mw file gives me a correct result while wholecode.mw does not execute the linalg commands. For example, in filename there is:

for i from 1 to 8 do

s:=col(A,i);
A1[i] := dotprod([1, x1, x2, x3], s);

od;

while test.mw gives the result wholecode.mw just gives

diff ~ (tilde) of a Matrix...

Maple

Hi!

i want to compute the differentiation of a matrix elementwise:

diff~(psi,x1);

But Maple gives only the output ~(diff(3x15 Matrix))

What do I have to do?

Thank you for suggestions!

Integration of piecewise is so slow...

Maple

Hi!

I want to claculate a triple integral of a piecewise function. The piecewise function has 17 domains and I guess that this is a bit too much.

Is there any possibility to optimize it?

the piecewisefunction looks like this:

a := unapply(piecewise(
x1 < 0 or x2 < 0 or x3 < 0 or h < x1 or h < x2 or h < x3, 0,
0.5*h <= x1 and x1 <= h and h-x1 <= x2 and x2 <= x1 and h-x1 <= x3 and x3 <= x1, A1[13],

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