## Plotting functions which simply get values from ar...

Hello, Can anybody suggest a workaround for the error I am getting?

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## Weighted standard deviation gives wrong answer?...

Okay, I know Maple's not giving the wrong answer...I'm sure I'm just asking the wrong way. When I ask for the standard deviation (Statistics:StandardDeviation) of a list of individual data samples, I get the expected answer. However, when I provide a list of values and a list of frequencies, I don't get the answer I'm expecting. Hopefully the attached worksheet will make my problem obvious. View 1058_std_dev_problem.mw on MapleNet or

## Updating a MathML viewer continuously...

Hi, I'm trying to set my MathML viewer to update constantly, as a certain animation in a plot changes. I would either need some type of "time delay" device since the animation works by millisecond delays (which I am able to control), or some type of animating function that isn't for plots, but for procedures. Basically, I am looking for a way to use Set or SetOption over and over again, at specific intervals, without having to click a button or perform a certain action each time the option changes. Thanks for any help.

## Solving PDE Using numeric method

by: Maple
Hi everybody! a few weeks ago I asked in this forum a question: http://www.mapleprimes.com/forum/partial-differetial-equation-heat First I have to say that is really nice how easliy it solves the problem. Now, I really need to see values in the solution (I mean, by given x and t). In addition, I want to create graphs of the temperture as a function of t (I mean to state x, and then to check the temperture as a function of t in this x). Only I know is to do graphs of the temp' as a function of x) How can I do all of those things? Thanks A LOT !!! RedFox (:

## Graphing more than one set on the same graph with ...

Is there any way to plot more than one pointset on the same graph using pointplot. On my worksheet the following worked plotpoint(points,color=red); plotpoint(points2,color = blue); But not plotpoint({points,points2},color = [red,blue]); or plotpoint([points,points2],color = [red,blue]); Any suggestions?

## 2 variable ?...

ok me again, I have this economic problem. Dc( pc , pt ) = 2000+1000*pt-2*pc Sc (pc) = 23*pc how can I plot this, and If I don't know what the value of (pt), can I still plot this? thank you so very much in advance.

## Economics...

how do I find the value of (p) that will make an equation equal to an other. ex: D(p):=82-0.75*p and S(p):=1.3*p how do I make maple find the answer. ( I know its way more easy by hand, but I would still like to know). thank you ! Jp

## A graph drawing problem (networks package)...

I'm just trying to draw a Petersen graph with one vertex removed, using Maple 10: ```with(networks): P:=petersen(): Q:=duplicate(P); delete(1,Q): draw(Q);``` I don't see anything wrong with these commands, and yet I get an error message: "Error, (in draw/concentric) not a list of vertices [1,2,3,4,5]" Yes, I know that - I've just deleted vertex 1. But surely I should still be able to draw the resulting graph? I know I can fiddle about with "Concentric", but I don't want to... And another thing: the inplace implementation of "delete" is, I think, contrary to reason. I would rather have:

## How do I draw a triangle along with other vectors ...

Does anyone know how to draw a triangle in 3 space with three points? Also, I need to plot 3 vectors on the same graph. Thanks

## Can maple be taught to differentiate polynomials w...

Dear All, I'm working on a problem in differential equations where I need to compute the n-th power of a differential expression. Can Maple be taught to differentiate polynomial functions without carrying out the multiplications / simplifications that it usually does? For example: diff(-2*c/x^3,x); gives the answer 6*c/x^4. I want it to return: (-3)(-2)*c/x^4. Ideally, I also do not want it to simplify sums of such results. Thank you very much, I appreciate your help! Andrea Bruder

## Show problem?...

Okay, well...we're using maple for our math lab in our school and we tried to work on our project. We had this matrix: A := RTABLE(419945880,MATRIX([[a, a, a, a], [0, 0, 0, b], [0, c, 0, 0], [d, 0, 0, 0]]),Matrix) And when we tried to get the inverse, it would just lazily respond: Inverse(RTABLE(419945880,MATRIX([[a, a, a, a], [0, 0, 0, b], [0, c, 0, 0], [d, 0, 0, 0]]),Matrix)) And it's been working like that for other matrixes, I don't know if I need to configure maple in a different way or something...?

## Problem with an if/then control structure...

I am working on a project in Maple 10 that was originally designed for Maple 9.5. I am trying to define the weighting function wt. The problem is that the instructions say to type the following command line: wt := n -> if n=0 then 1 elif n=NInts then 1 else 2 end if; However, when I do, the following error message shows up with the phrase "n -> if" highlighted in a red box. "Error, invalid inline function wt := n ->if n=0 then 1 elif n=NInts then 1 else 2 end if;" Thank you for your help. Adam