The result of "1/3 mod 7" is "5",how to understand it?What's the syntactic rule behind it?

How do you find the intersection of 2 subspaces of R4

v1= [x(1,2,3,4)+y(0,2,3,2)]

v2= [x(3,2,1,1)+y(3,1,1,3)+z(6,4,2,2)

 

Hi all,

 

I need to:

a) Find the equation of the sphere passing through the 4 points [- 8, 3, 11], [5, - 7, 1], [- 15, 4, - 6], [10, 2, 9].  Give the coordinates of its center and its radius.

b) Plot together the sphere of part a along with the 4 points of the dataset.

 

I can't seem to get maple to do this!  I am very frustrated as the sphere command doesn't even seem to work.  I am a total maple n00b...

 

Download 321.mw

There is a problem which I feeling very puzzling, it is not the codes, but about when running the codes. It seems that if I running the codes immediately (or use "run all the worksheet" ), an error returned unexpectedly, but if I wait a few seconds before rerunning the code which just causes the error, a correct result returned. I feel very...

Hi all,

when drawing a geometry.line object by using geometry.draw, the default for each axis is -10..10, so that I cannot see in the plot, for example, the line y=11;

How can I extend this range?

 

Best regards

Ouba

even if I use a simple x^2+y^2 plot I get these funny gaps at the botom of the plot. I have looked through the FAQ files and can't seem to find a solution to it... is there one ?? from what I have seen so far there does not seem to be an easy solution. with a graph like the type above to change to coords=spherical or cylindrical does not show the same graph due to that change.

Hi,

How to load Maple-NAG connector to execut this example ?

Is it an additional program to install ?

n := 4:
nnz := 11:
la := 22:
lfill := 1:
dtol := 0:
pstrat := "Nag_SparseNsym_CompletePiv":
milu := "Nag_SparseNsym_UnModFact":
a := Vector[row](la,[1.0,1.0,-1.0,2.0,2.0,3.0,-2.0,1.0,-2.0,1.0,1.0],datatype=float[8]):
irow := Vector[row](22,[1,1,2,2,2,3,3,4,4,4,4],datatype=integer[kernelopts('wordsize')/8]):
icol := Vector[row...

Hello,

 

I was wondering if someone could assist me with the code for listcontplot.

 

I've tried the following:

 

M:=Student[LinearAlgebra]:-RandomMatrix(4,4);

listcontplot(M);

 

But this does not work.  Is there any way to use listcontplot, listcontplot3d, or any other command to generate something similar to what Excel calls a Surface - contourplot?

Thanks.

Hi, friends

The physics package was provided a good tool to compute Commutator or anticommutator relations. Here, I met some problems.

Example 1:

      restart: with(Physics):Setup(mathematicanotaion=true):

      Setup (op={p[x],p[y]},p[z]):

      alg:=%commutator(p[z],p[x])=2p[x], %commutator(p[z],p[y])=-2p[y], %commutator(p[x],p[y])= p[z]

Why the "Mean" command of the "Statistics" package gives the correct result with MAPLE 12 and MAPLE 13 and not with MAPLE 14 ?

restart;
with(Statistics):
X := RandomVariable(('Uniform')(-1, 1)):
Y := RandomVariable(('Uniform')(-1, 1)):
pdf := simplify(PDF(sqrt(X^2+Y^2), rho)):
R := RandomVariable(Distribution(PDF = unapply(pdf, rho))):

The mean may be computed using (the answer is correct)
int(rho*pdf, rho = 0 .. sqrt(2)):

 ...

Hi,

I'm teaching numerical analysis with Maple and then I started with fixed iteration method.

When I programed the method which is simple, I got the solution as:

restart:with(Student[NumericalAnalysis]):

f := x->2*tan(x)-x-1;

g := x->arctan((1/2)*x+1/2);   # fixed point method where the solution of x=g(x) is the the solution f(x)=0

x[0] := 0.2; for k from 0 to 20 do x[k+1] := evalf(g(x[k])) end do; this line give the solution

Hi everyone,

I'm having trouble solving a set of pdes and keep encountering the following error:

Error, (in pdsolve/indexlex) invalid input: a string/name list is expected for sort method `string`

 

I have been trying to find out why I get the error or what the indexlex error is but am stumped... I cannot find anything on the Maplesoft or mapleprimes websites about it.

 

This is the code I am using which is giving the error:

Dear all,

I come up with a problem. When I execute the following commands in 2d mode, error occurs:

restart; with(MTM); with(plots); r := .125; omega := .3; l := 1; m := 4.5; IG := (1/2)*m*r^2; A := Matrix(4, 4, {(1, 1) = 0, (1, 2) = 0, (1, 3) = 1, (1, 4) = 0, (2, 1) = 0, (2, 2) = 0, (2, 3) = 0, (2, 4) = 1, (3, 1) = 0, (3, 2) = r*omega^2*(IG+m*r*(r+l))/(l*IG), (3, 3) = -2*ldt/l, (3, 4) = 0, (4, 1) = 0, (4, 2) = -r*omega^2*(IG+m*(r+l)^2)/(l*IG), (4, 3) = 2*ldt/l, (4, 4...

Curiously I find myself guilty of never filling out the document properties fields. Author, Keywords, Subject and Title. I have also noticed that no one else, or at least a majority of maple users don't bother with this although I haven't found anyone who actually does fill these fields out, just browse the applications in the application center. What other usefullness do these attribute field placeholders have? Seeing that no one makes use of them, it doesn't seem that...