My first Question ever.

I am trying to create 3d surfaces between spacecurves 

I have tried various approaches with Known curves and stringing polygons between points on different curves. Currently I am stuck, I need to create surfaces between circles of known radius and centre position but the evalf or solve funnctions return values that have to be manualy cut and pasted into spacecurve. Think of the Tapered Candle cut into cross sections but in my case...

I have a complicated vector equation that I'm trying to solve.

(W x V) / [(W x V) . (W x V)] = A / (A . A)

where x is the cross product and . is the dot product.

Here is what I know, v1, v2, v3, a1, a2, a3, and i know the magnitude of w.

I need to find w1, w2, w3 in terms of v's and a's only. 

I tried using the solve function but I'm not getting anywhere using that.

Any help would be greatly appreciated.

Thanks.

Hi

This is the problem:

deq := (2*.1)*[(y(t)*(diff(y(t), t, t))-1)*(1+(diff(y(t), t))^2)^(3/2)-y(t)*(diff(y(t), t))^2*(diff(y(t), t, t))*sqrt(1+(diff(y(t), t))^2)]-2*sin(t)*(1+(diff(y(t), t))^2)^2 = 0;

dsolve({deq, y(0) = 0, (D(y))(0) = 0}, y(t), numeric)

Error, (in DEtools/convertsys) unable to convert to an explicit first-order system

So Maple signs an error, but I don't know why.

Any help will be appreciated.

How do I split the data up into seperate lists? 

A simple example
a:=[class,23,45,74,34,25,76,class,55,67,78,34,65,12,23,45,64,23,class,12,13,15,class,99,98,97,59, ... ]

So I want to seperate the data out like this
a[1]:=[[2..7]]
a[2]:=[[9..18]]
a[3]:=[[20..22]]
...etc

So I'm not sure how to get maple to skip the word class that seperates the data and store them into seperate lists.

As I have recently learned, the environment variable 'Digits' controls the working precision and is therefore crucial for avoiding significant impacts of round-off error effects on floating point computations.

Moreover I discovered, that even when I set Digits to say 20, Explore is not affected.

Is there a way to control the working precision of the floating-point computations carried out by the Explore option?

a:=Array(1..2,1..2,[[2,3],[4,5]])

writedata("c:/test.txt",a)

Error, invalid input: writedata expects its 2nd argument, Data, to be of type {set, hfarray, list, matrix, array(1), list(list)}, but received Array(1..2, 1..2, {(1, 1) = 2, (1, 2) = 3, (2, 1) = 4, (2, 2) = 5})

Since array is the deprecated version of Array you would think Array would work using writedata in Maple 12

But it does work with array.  Since I only have access to Maple...

Maple carries out the following solving task without any problems:

restart;
with(Statistics):
X1 := RandomVariable(Geometric(q)):
s1:=solve({mu=Mean(X1)},{q});

Anyway, when I add common assumptions (0<q, q<1), then Maple will not carry out the task:

restart;
with(Statistics):
X1 := RandomVariable(Geometric(q)) assuming 0<q, q<1:
s1:=solve({mu=Mean(X1)},{q});

Why is that the case?

Hello 

Here are the commands, I can't understand why this error comes out

http://i1.ambrybox.com/070710/1278460271555.JPG

It comes out when I want to do this: display(Lines,A)

P:=<1,2,3>

P1:=<-1,-1,0>

P2:=<-1,-1,0>

P3:=<0,-1,-1>

Plane:=x+2*y+3*z

L1:=P+t*(P1-P)

L2:=P+t*(P2-P)

L3:=P+t*(P3-P)

Lines:=spacecurve([L1,L2,L3],t=-2..2)

A:=implicitplot3d(Plane=0,x=-2..2,y=-2..2,z=-2..2)...

I have an equation that I'm solving, but I'm not quite sure how to properly use the solve function.

Here is the equation: w X v / ((w X v) * (w X v)), where X signifies a cross product and * signifies a dot product.

I'm trying to solve for the variable w.  How can I properly use the solve function to help me isolate this variable?

Thank you

I made a program that spits out and alpha and beta at the end of each procedure. What I need to do is assign each alpha and beta a unique name. IE, when it runs the procedure 1, I need it to name them alpha1 and beta1, then for proc2, alpha 2 and beta2. For as many times it needs to run through this process because it may go through proc1 more than once.

It seems I can't find the resource I need, just that one little tidbit in the help files. Any help would be...

dsys := {1/2*diff(theta(t),`$`(t,2))*cos(phi(t))+5/4*diff(theta(t),`$`(t,2))+5/4*diff(phi(t),`$`(t,2))+1/2*sin(phi(t))*diff(theta(t),t)^2, -1/2*mu(t)*sin(phi(t))*diff(theta(t),`$`(t,2))-diff(phi(t),`$`(t,2))+1/2*mu(t)*cos(phi(t))*diff(theta(t),t)^2+5/4*diff(mu(t),`$`(t,2))-150000000000/(1+exp(27.0-15*sin(theta(t))-15*sin(theta(t)+phi(t))))^2*cos(theta(t)+phi(t))*exp(27.0-15*sin(theta(t))-15*sin(theta(t)+phi(t))), (-1-mu(t)*sin(phi(t)))*diff(theta(t),`$`(t,2))-1/2*mu(t...

Hello,

I am new to Maple and I am interested to know what programming language Maple is written in - I mean the maths part of Maple of course and not the interface which appears to be in Java.

Thanks in advance,

Julien.

What is the Problem? Do not use SingularValues (A, output = ['list'])?
Some care in handling this command?

Hello,

I am tying to compute the wronskian of a set of functions. I loaded the LinearAlgebra package and still Maple won't recognize the following command:

wronskian(x, x^2, x^3)

Can anyone please help?

Thanks in advance,

Julien.