I need to mark the point in which x,y,z interesect on a 3-d graph.  Can anybody offer and advice as to how this can be done?

 

Hello,

I'm using maple12 and I have a problem with a homework:

restart;
with(plots);
with(DEtools);
eqn := D(y) (x) = sqrt(x^2+y(x)^2);
plot1 := phaseportrait(eqn, y(x), x = -5 .. 5, [[y(0) = 0]], y = -5 .. 5, linecolor = [blue], dirgrid = [30, 30]):
plot2 := implicitplot(x^2+y^2 = 1/4, x = -5 .. 5, y = -2 .. 2, grid = [100, 100], color = green):
plot3 := seq(implicitplot(x^2+y^2 = k^2, x = -5 .. 5, y = -5 .. 5, grid = [100, 100], color = green), k = 1 .. 5);display([plot1, plot2, plot3])

hello,

i have had many troubles with maple 12 recently, and perhaps some of you could educate me on how to do things better.  although i could use different software, i've been doing this particular project on maple and figure that it should be able to work.

Write a procedure INVERSE2by2MATRIX to find the
inverse matrix of 2 by 2 matrix.

THANKS

who can help me with following question?

Write a procedure MULTIPLYMATRIX to find the
multiplication product of an h x i matrix and an i x j matrix.

that is what I do. is it right?

mult := proc (A, B, C::evaln) local h, i, j; h := LinearAlgebra[rowdim](A); i := linearalgebra[coldim](A); j := linearalebra[coldim](B); A := array(1 .. h, 1 .. i); B := array(1 .. i, 1 .. j); C[h, j] := `&*`(A[h, i], B[i, j]) end proc

 

 

I want to increase the length of a slider so I can display more values .

How can this be done ?

Hi, I have written the following code in maple.. which I have to compare with the crank-nicolson scheme written in matlab.. that code is well.. but this is not working.. i need to analytically solve the heat equation PDE := diff(u(x,t),t)=1/2*diff(u(x,t),x,x) IBC := {u(x,0)=T0, u(0,t)=0, u(d,t)=0}: vals := {a=1/2, T0=0.1*sin(x), d=pi}: PDE := eval(PDE,vals); IBC := eval(IBC,vals); sol := pdsolve(PDE, IBC) i get this error Error, (in pdsolve/sys) too many arguments; some or all of the following are wrong: [{u(x, t)}, {u(0, t) = 0, u(pi, t) = 0, u(x, 0) = .1*sin(x)}]

Hi,

I have this equation:

> Eq := cT*a*b*sT+cT*c+sT*d+cT*sT;

I want to substitute cT*sT by s2T. But when I try to use subs it doesn't work because (I think) in the first term it's cT*a*b*sT and not a*b*cT*sT. I can't use collect as well because not all terms have the both variables.

This is a simple example, but my equation have like 40 lines and I really want to do in a automate way, so I don't have to do this manually everytime I change the values.

Thanks in advance,
Rodrigo

I have a large variable (an array of 3*n elements, where n may end up large) containing data from a simulation in maple. I would like to further play with this data in matlab, but cant find a way save/export the array in a way which matlab can read from, thanks for any help.

A=[0 0 60

      1 0 7

      0 1 -6]

How can I find the eigenvalues and a correspnding eigenvector for each eigenvalue for A^5.(A to fifth power)

View 1600_Polar Help.mw on MapleNet or Download 1600_Polar Help.mw
View file details

 

Please see the attached Maple 12 file. I need help in entering and solving this type of polar coordinates.

Any help will be appreciated greatly

TIA

Malt_master

As the title says already:
Is it possible to stop Maple when executing the entire worksheet with !!! ?

I want to check some intermediate output before the rest of the worksheet should be executed.
I searched for help on 'break', "quit', "wait', "pause', 'exit', but can't find a command that does the thing I want.

Any ideas?

Petra

Im trying to graph a cardioid r=8-8sin(theta). Ive tried interactive plot builder and even 2d input but i cant get it to work at all. I am pretty new to maple so any help would be appreicated.

thanks

How do I use ProbabilityTable so that the first element in P denotes the probability of zero, and not one? That is I have three states: 0,1, and 2, and I want them be an immediate output of my Sample. Thanks.

with(Statistics):
P:= [1/2,1/8,3/8];
X:= RandomVariable(ProbabilityTable(P));
ProbabilityFunction(X, 0);
Sample(X, 10);
 

<p>Hello Everyone.</p>
<p>Suppose I have a list of list.</p>
<p>[[1,2,3,4],[2,3,5,5],[3,4,4,6],[4,5,5,7]]</p>
<p>I want to sort this list <b>descendingly </b>according to its <b>third </b>element.</p>
<p>So it becomes:</p>
<p>[[1,2,3,4],[3,4,4,6],[2,3,5,5],[4,5,6,7]]</p>
<p>and then I want to sort it <b>descendingly </b>accoring to its <b>fourth </b>element.</p>
<p>So it becomes:</p>
<p>[[1,2,3,4],[2,3,5,5],[3,4,4,6],[4,5,6,7]]</p>
<p>Is there any way to acheive this?</p>
<p>Thank you in advance.</p>