## typesetting...

hi i have one question in maple is many function which can have two 2D output like sum: Sum(f,i=3..n); in 2d Sum(f,i=3..n); sum(f,i=3..n); in 2d (n-2)f; for example i wanna my own function which will has two forms like a sum but in unevalued form will be instead of sigma for example Q or another symbol and above and belove that symbol will be some values, and in evaluated form there will be expression or number; another example is Diff or BesselJ funcions which have both two forms (symbolic/algebraic) my question is how to make this? Q(4,2);

## Picking the Eqn from PDE system to plot in plot3D...

Greetings! Newbie to the forum... I have created and solved a set of 2 PDE's, and I am trying to plot the results. I am capable of seeing the results of the second PDE by using the default command below. Is there a way to specifically pick which PDE to plot (I'm sure there is, but I can't seem to figure it out). pds := pdsolve(PDEset, PDEIC, numeric, time = t, range = 0 .. 30); pds:-plot3d(t = 0 .. 5, x = 0 .. 30, axes = boxed); Any help appreciated! Fred

## Converting strings from readline() into procedures...

My goal is to have users question banks in text files, and then read the data (both text and Maple procedures) in, through the readline function. The problem is, when I use that function, they come out as strings. For instance, if the first line of my file default.txt is diff(x^2,x) then the command readline("default.txt"); will display "diff(x^2,x)" I've tried using the convert function, but I can't find a type that will change it to a procedure. convert(aString,symbol) puts it as a symbol, but when I assign a variable to that symbol all it does it spit the symbol back out, it doesn't execute it. And if I use type(aString,procedure), it makes a procedure which displays the string. I need to remove the double quotes somehow and turn what's inside into a full-fledged Maple procedure. Any ideas?

## Should this compile...

When I saw a statement on a post I thought "I didn't know you could do that". I downloaded it and it wouldn't compile. Here is the statement. G := (i,j) -> if is(i,even) and is(j,even) then 1; else 0; end if; When I tried to compile this in MAPLE 10 I got an "invalid arrow proceedure" error. Should this compile? Thanks

## fi...

In a number of posts containing code I have seen the expression fi. When I type ?fi I get the help file on if. I read through this file and find no reference to fi. Could someone explain what fi is and/or where I might find it discussed in the help file? Thanks

## Eigenvalue solution by Dsolve numeric...

Hello everybody! Could anybody help me How can I obtain a numerical solution for an ordinary differential eigenvalue problem? I suppose that it can be something with "dsolve,numeric". Thank a lot

## Definite integral with maple?...

Dear all: Anybody could tell me how can I obtain this integral with maple? Int(u^(d)*coth(u/2), u=0..infinity); where "d" is positive thank a lot D. Reyes CBPF

As a project I have found need to create a new type through the external calling interface of maple. To allow for easy use of this type I have been overloading the operators to handle this new type. Most of them seem to work quite well but I am having a problem that by overloading these operators some totally unrelated functions seem to break (even when not dealing with my new type).

## Dsove,numeric...

Hello everybody! I again have a problem with "Dsolve numeric". I solve a system of linear ODEs with boundary and continuity conditions.I got an error, which is associated with any internal procedure of Maple. For the sake of simplification, I reduced the order of equation from two fourth-order ODEs to the eight equations of the first order, but the same error is outputed. Download 2847_problem-1-1.mws

## 3D plotting...

Hello, my question is very simple but I can't find the way to do it. I have to plot several 3D-dots(x, y, z) over a 3D-sphere. Please, can anyone help me? Thanks!

## Excel...

Is there a way to take data from an Excel Spreadsheet and easily put it into a matrix in Maple 10?

## Animate a plot...

This is my worksheet: > a:=10: > f:=6: > for i from 1 to 12 do b[i]:=arrow(r[i],F[i])od: F[i] are predefined vectors and r[i] are the points form which they start. > with(plots): > with(plottools): > A:=seq(b[i],i=1..12): > > > B:=plottools[line]([0,0,0],[a,0,0],thickness=3,color=black): > C:=plottools[line]([0,0,0],[0,a,0],thickness=3,color=black): > unprotect(D): > D:=plottools[line]([a,0,0],[a,a,0],thickness=3,color=black): > E:=plottools[line]([a,a,0],[0,a,0],thickness=3,color=black): > > F:=plottools[line]([0,0,0],[0,0,a],thickness=3,color=black): > G:=plottools[line]([a,0,0],[a,0,a],thickness=3,color=black):