Hello.

If I have several equation where some of them are given in cartesian and some in spherical I would want to work with all surfaces in cartesian coordinates. Just since that is the coordinate system i´m most familiar with.

I have cheked and tried: ChangeOfVariables, changecoords and ?coords

All of those are great recourses, but they wont let me change from [r,theta,phi],cartesian[x,y,z] How can I obtain that in maple?

Hi.

This might not be a maple question. But I know maple has very smart and many plotting tools as well as this comunity is full of very skillfull people. So I concluded that I might get an answer here.

Lets say I got some sphere that is cut off by any abirutary plane, how would I go about plotting this?

For the purpose of this example the sphere is centred at the origin with radius of 4 and are cut of by the plane z=2-y.

I am trying to graph an olique cone with a circular base, and I am having trouble learning how to generate an equation for it. Any help is greatly appreciated!

when i try to get a numerical solution(using fdiff) for a second order derivative from a numerical diff ecuation procedure i got "index out of range". however, it perfectly works with a first order derivative. what's thwe matter there?

thankyou very much..
 

Download numeric_diff.mw

Sometimes I got an error (purple in output). How can I catch on programming level?

I mean I want to do smth like: if <error> -> then <action>

If you have a list that is too large the list will go off the screen without a way of scrolling.

Is there a way around that?

Here's some test code

with(Maplets):
with(Elements):
maplet := Maplet([["Pick a color:  ", ListBox['LB1'](sort(["blue", "red", "wheat", "yellow", "brown", "gold", "plum", "orange", "pink", "khaki", "magenta", "maroon", "white", "green", "aquamarine", "black", "gray", "navy", "coral", "cyan", "sienna", "tan", "turquoise", "violet", seq(i, i = "a" .. "z")], lexorder))], [Button("OK", Shutdown(['LB1'])), Button("Cancel", Shutdown())]]):
result := Maplets[Display](maplet);

I'm trying to solve a system that contains the Laplace homogeneous equation and the boundary/initial conditions, thus i'm typing the following code:

> LAPLACE := (D[1, 2](u))(x, y)+(D[2, 2](u))(x, y) = 0;

            D[1, 2](u)(x, y) + D[2, 2](u)(x, y) = 0

> sys[1] := [LAPLACE, u*(x, 0) = 0, u(0, y) = 0, u(1, y) = 0, u(x, 1) = x^2*(1-x)];

[(D[1, 2](u))(x, y)+(D[2, 2](u))(x, y) = 0, u*(x, 0) = 0, u(0, y) = 0, u(1, y) = 0, u(x, 1) = x^2*(1-x)]

but when i use the command pdsolve(sys[1]) the message below appears:

"Error, (in pdsolve/sys/info) ambiguous input: the variables {u} and the functions {u(0, y), u(1, y), u(x, 1), u(x, y)} cannot both appear in the system"
 

So, it seems the declaration of the system isn't correct, but it's exactly how the tutorial of the maplesoft shows it. Could you please make clear what is a system of pde for maple and what is the correct tool for solving a system with boundary/initial conditions?

 can you help me to solve BVP by using homotopy perturbation method
 

Download homotopy.mw

Hello.

When I m working on my laptop the plots wont show as it would on my stationnary machine. The surfaces is smooth without any grid and spacecurves dont display at all.

I have tried to uninstall and install maple without sucsess. This is maple 2016

Hello

My question regarding a lookup function is enclosed in the file.

lookup.mw

The Maplets, Elements, ListBox (ListBox) example given on the help page doesn't work.  I use the button to transfer the page to a worksheet window but then when I execute them I get an error.  Below is the example given on the help page.  And following that is the errors given after execution.

Is it possible to get maple to show the system of equations as output?

Thanks

Q1: Pascal’s Matrix of order n is given by:
Sij =(i + j)!/ i!*j!
Use Mable to produce Pascal’s Matrix of order 8.

Q2: Study the Matrix decomposition (i.e. QR, LU, and LLT), then use Maple to produce these decompositions for a random Matrix of order 6.

Q3: Write one paragraph of your own to explain Moore-Penrose Inverse of a Matrix. Use Maple to find Moore-Penrose Inverse for a random Matrix of order 8.

Q4: Use Maple to find Jordan Canonical form for a random Matrix of order 10.

Q5: Use the seq command to generate the triple [i,j,k] for all possible values for 1 ≤ i,j,k ≤ 10, then plot this triple. i.e. Use nested seq .

Q6: Let F[n] be the set:
F[n] = {p / q: 1 ≤ q ≤ n,p ≤ p ≤ q}
Use Maple to find F[6].

To keep upgrading Maple in our university we need to justify it's usage. We have an unlimited floating license. How can we track the usage of Maple by our students, faculty, etc?

f1:=(1/s^2)^N;

Maple failed to convert it into  f1:=s^(-2N);