## Symbol table used with an Array of Records...

I'm still making the transition from VB thinking to MAPLE thinking. In VB I delcared an 9 x 9 array of type square, where square was defined by Private Type square NumPossible As Integer Possible(9) As Boolean Number As Integer End Type I am trying to do the same thing in MAPLE with the code below. Since MAPLE is more flexible than VB, a certain possibility occured to me. With the code I have written below, does MAPLE have to store in its symbol table at run time 81 copies of the symbols 'Number', 'Possible' and 'NumPossible' ? Square:=Array(1..9,1..9); InitializeArray := proc ()

## Factor completely: x^2 - 2x^2 - 4x - 8...

I'm not sure where to start on this problem. Can anyone help?

## What does Maple 11 for Linux look like?...

I was just curious what Maple 11 for linux looked like? Does it look the same as Maple 10 or better? I ask because I've noticed that a lot of the commercial linux versions of products are given a crappier looking interface. Any screenshots that someones aware of? Thanks in advance

## supplying boundery conditions for differential equ...

Hi. >sol2:=dsolve( {diff(c(x),x,x)=c(x) , c(0)=5, int(c(x),x=0..1)=3 },c(x)); Error, (in PDEtools/sdsolve) the input system cannot contain equations in the arbitrary parameters alone; found equation: _F1[x]-3 this is a DE of second order, so it requires two conditions to find the constants.. I wanted to give one of the conditions in the form of an integral, but i get the error above. Any idea why? thanks

## Can't understand the output...

I wonder if someone would be kind enough to explain the output I am getting in the simple attached file. I understand the array that is being output - that is what I want. But why the 9 below it, and the pair 'true,true' near the bottom? -Thanks View 2292_IncrementGroup.mw on MapleNet or Download 2292_IncrementGroup.mw
View file details

## Not equal to or greater than?...

Hello peeps, In some of my calculations, I need to find and answer that is greater than or not equal to a certain value.... for example differentiate a function which gives x=-2 & x=3, if I now wish to define has to be x>0, how would I incorporate that into my maple command? Thanks in advance

## Plotting Vector functions...

Hi, I am trying to find out how to plot a vector function. I have the following vectorfunction: ([t^2-3],[1/2*t^2+2*t+1]) How do I plot this vector in maple? Thanks in advance

## y(t) and y cannot both appear in the given ODE....

I'm trying to find y as a function of x in an equation. Here's the outline of my method: Suppose I have the following ode: ode := x^2*(diff(y(t), t, t))-3*x*(diff(y(t), t))+2*y = x^2 IC := y(0) = 7, (D(y))(1) = 2 dsolve({ode, IC}, y(t)) But I get the following: Error, (in ODEtools/info) y(t) and y cannot both appear in the given ODE. I'm not sure about what I'm doing wrong here in the syntax? Any hint would be appreciated. Thanks.

## too many levels of recursion!@#...

I'm trying to use dsolve on the following equation, but it gives me the following: "Error, (in tools/map) too many levels of recursion" - deq := (diff(y(t), t, t))+2*(diff(y(t), t))+26*y(t) = 6*exp^(3*t) dsolve(deq, y(t)) I'm usually better with Matlab but Maple is driving me nutttts! Any help would be much appreciated.

## hypergeom & integration...

Would anyone be able to help me integrate ones like the following: Int(1/exp(eta)*eta*hypergeom([1, 1, 1],[2, 2, 2],eta),eta); I've tried using convert, simplify, etc. but nothing works. Many thanks, Sandra

## Using a proc to change a member in a list...

Suppose I want to use a proc to change an element in a list. I run into this problem > TestProc := proc (s) s[3] := 5 end proc; > s := [1, 2, 3, 4]; [1, 2, 3, 4] > TestProc(s); Error, (in TestProc) illegal use of a formal parameter I realize I could make s a global variable, but what if I want my proc to be able to operate on *any* list? In C++ one would use a pointer, but I don't see that kind of capability in MAPLE. Is there another way to do it? -Thanks

## Solving 2nd order ode with IC???...

Hi - I'm new to Maple. I can't seem to solve an ode with Maple because it gives me this error: Error, (in combine/exp) too many levels of recursion Lets say I have the following equation: > diffEq := (diff(y(x), x, x))-7*(diff(y(x), x)) = 7*exp^(3*t); I try the following and include the ICs: > with(DEtools) > dsolve({diffEq, y(0) = 1, y'(0) = 3}, y(x)); I wanted to know why this doesn't work? Correct syntax would be great. Thanks.