## MaplePrimes Questions

As many before me, ive lost all my note to this problem. Is there any chance to salvage this document or is it gone.

I hope you can help me

Maple Worksheet - Error

Failed to load the worksheet /maplenet/convert/INS2.mw .

## Equation of a sphere (2)...

Let A(1,-2,3), B(-1,0,1) be two points and (P): x+y+z+4=0 be a plane. Write the equation of the sphere has center lies on the line AB, radius of sphere equal to AB/6 and sphere tangent to the plane (P).

This is my code.

> restart:with(geom3d):

point(A,1,-2,3):

point(B,-1,0,1):

line(AB,[A,B],t):

eq:=Equation(AB):

point(M,op(eq)):

## To draw a disk...

Hi,

I'd like to draw a disk with center (0,0,0) , radius 1, in the plane theta=constant (or y=tan(theta) x), where theta is given different of 0.

How can I proceed?

Thanks.

ALS

## plotting using DEplot...

i have a differential equation like below

with(DynamicSystems):

with(DETools):

ivs3:=[y(0)=100,y(0)=250,y(0)=800]:

DEplot(sys1,y(t),t=0..1000,ivs3);

i tried to plot this diff equation but received an error message:

Warning, plot may be incomplete, the following error(s) were issued:

## finding equilibrium point...

how to find the equilibrium point of a differential equation y'(t)=(800-y(t)).y(t)/(100+y(t))

## how to use the result obtained from the function m...

Hi,

I work on a dynamic programming problem and I must used the result of a maximization function, but I can not

## simple matrix question...

Hi,

I have ZeroMatrix(33)

How do I ask Maple to give me a big matrix form instead of just stating "ZeroMatrix(33)"?

[0 0 0 0 0 0 0 0 0 0.....]

[0 0 0 0 0 0 0 0 0 0.....]

[0 0 0 0 0 0 0 0 0 0.....]

..

..

## Problem with polarplot in Maple 15 (both 15.00 and...

There no curve on the second of the following two polar plots. Why? (I am using the 64 bit version on W7)

restart:

with(plots):

polarplot([3+4*cos(theta)],theta=0..2*Pi, radialstart=-2,angularorigin=bottom,legend=["Zero wind"], legendstyle=[location=top,font=[Times,roman,14]],labels=["G-force [G]",""], font=[Times,roman,14],labelfont=[Times,roman,14],

## Equation of a sphere (1)...

Let A(1,-1,-1), B(2,1,2), C(1, 3, 1) be three points and Delta: x = -t, y = -t, z = t be a line. Write the equation of the sphere (S), knowing that center of (S) lies on the line Delta, (S) passing the point A and cuts the plane passing through the  three points A, B, C cut (S) a circle has least radius.

This is my code.

> restart;

with(geom3d):

a:=[-t,-t,t]:

## Error, invalid input: with expects its 1st argumen...

http://www-igm.univ-mlv.fr/~gauthier/HYPERG.html

Error, invalid input: with expects its 1st argument, pname, to be of type {`module`, package}, but received HYPERG

HYPERGLIB := "D:/Feb2012/";
libname := libname, HYPERGLIB:

both methods above.

after typing PolyRecSol(H...

no result in Maple 15, just return similar command, no equation return.

## How do I efficiently share and multiply with a lar...

Hello Maple wizards,

I have two questions for you today.

First, a program I'm developing in Maple 15 does frequent matrix multiplication with a constant float[8] matrix. I hope to take advantage of multiple processors in my 6-way desktop processor and/or CUDA features of the Nvidia GPU card. The program is large enough that maintainability and good programming practice dictate that it be broken down into multiple procs. In addition, I'm considering...

## animate implicitplot (a heart shape)...

I haven't posted here in a while, and am not sure how to enter things, so this may not post correctly. But what I need help with is how to animate the following so that they will actually "draw" the heart shaped implicit plots either from the top down, or the bottom up, or however else might look interesting.

## Poor performance of Statistics[NonlinearFit]...

I'm trying to approximate points with a function of certain form with Statistics[NonlinearFit]I expect the graph in the second example to be closely approximate of the points, just like the first graph. For some reason, the second graph is way off. Seems like a bug. Any suggestions are highly appreciated.

Here is the code

`plotApprox := proc(listName)    local X, Y, convModel, modList;`

## Finding maximum and minimum values...

I have a region x^2 + y^2 <= 1 and y>=0. It's temperature function is f(x,y) x^2 - 2y^2 + x + y. How do I find the max and min temperatures on the lower boundary y=0?

I took the derivatives with respect to x and with respect to y such that:

fx:=diff(f(x,y),x);

fy:=diff(f(x,y),x);

Then I used fsolve({fx=0, fy=0},{x,y}) which game me (-0.5, 0.25)

Is there really only one critical point on that lower bound...