i am looking for a command adjoint a ODE, to check whether my understanding of adjoint correct or not, when i find one example different from my understanding as follows

u*diff(Y,t) - diff(U,t) + diff(y,t)*U = 0 where uppercase and lowercase are different

why after adjoint is

Y -> -u*diff(lambda,t) - diff(u,t)*lambda = miu1
U -> diff(lambda,t) + diff(y,t)*lambda = miu2

why not

Y -> u*diff(lambda,t) = miu1
U -> -diff(lambda,t) + diff(y,t)*lambda = miu2

A := diff(Y,y$2)-(y11)^2*diff(Y,y) = 0
B := diff(diff(Y,x),y) - y11*diff(Y,x$2) = 0

do maple have tool to get differential identity, or simple algebra identity?
that identity is an equation in terms of A and B and y11, not Y

I have two problems with type declarations in procedures. They seem to be related, so I'll ask both questions at once.

1. One problem is that I make this sort of declaration.

{[n,N]::positive:=1}

where n could be an integer or a float, but not negative nor complex. I'm not sure what's wrong with the code below: the type-checking fails, but I don't understand why. I followed the template laid out by Preben here:
http://www.mapleprimes.com/questions/134550...

Hello, I have this question:

I have to plot the roots of a polynomial of the 6th degree, a*t⁶ + b*t⁵ + c*t⁴ + d*t³ + e*t² + f*t = 0, where

a,b,c,d,e,f = g(sigma), then I use implicitplot function to plot t as function of sigma, I want to generate an array, vector or list of pairs as (sigma,t).

Thanks,

Benjamin.

I am writing a module that will have several procedures. This module will be loaded using "with(modulename)."

Inside one of the procedures (a procedure dealing with opening a data file) I am testing for the existence of a file and, if it does not exist, it should open a filedialog so I can navigate to the relevant folder that has the file. Like this (test is set from the existence-checker to be true or false):

if (not test) then # have to get and set currentdir

A simple question. I have looked at the help pages on "passing" and "declaring" arguments, which are very detailed, but couldn't quite spot the answer to my question, though I suspect it is there somewhere.

I have 2 procedures and want to pass the argument of one procedure to another procedure used therein. In the basic case, I seem to be able to do it without special precautions. However, I have not been able to make it work in a situation involving multiple spellings for the arguments ...

I installed Maple 15 for windows 64 bit on my pc but I have a problem with worksheet in its.

Worksheet isnt on my software.

sys := diff(y,t$3) + 3*diff(y,t$2) + 5*diff(y,t)  = diff(u,t$3) + diff(u,t$2) + diff(u,t)

x1 = diff(y,t)
x2 = diff(y,t$2)
x3 = diff(y,t$3)

how to do simple parametrization with x1, x2, x3 on sys, so that get 3 equations in terms of x1, x2, x3, u
result may be first order of x1, x2, x3

Dear Maple Users

In Maple 16 I read in the menu Help > What's New that it is now possible to have 3D plots exported as vector graphics, when using EPS export. I tried it, but could not open the resulting EPS file. I used my CorelDRAW 15 Suite ... Can someone tell me how I get access to the exported vector graphics?

If I cannot get it into CorelDRAW, it is not for much use. Maybe an intermediate process?

Regards,

Erik

How to implement the following procedure using the function Maple Statistics [CrossCorrelation]?  

alias(FFT = DiscreteTransforms[FourierTransform], IFFT = DiscreteTransforms[InverseFourierTransform]);

nd := Statistics:-Sample(Normal(0, 1));

 xcorr := proc (x, y)
local corrLength, c;
corrLength := op(1, x)+op(1, y)-1;
c := IFFT(`~`[`*`](FFT(Vector(corrLength, x, fill = 0), normalization = none), `~`[conjugate](FFT(Vector(corrLength, y, fill = 0...

Hey there i have written the following code and it gets very slow cause of the output at each step, which is not needed. I only need the arrays at the end of the procedure. Has someone an idea how i can suppress the output for the steps betweend the start and the end of the procedure?

restart:
s_1 := 0.779e-1*t^2-.1345*t+.2031:
s_2 := 1.3502*t-6.8742:
s_3 := .1112*t^2-1.5108*t+11.527:
s_4 := 1.9322*t-15.099:
s_5 := -0.178e-1*t^2+2.648*t-22.312:

Hey there,

if sometimes problems with my procedures, so i´m looking for a command which shows me the what the procedure is doing.

The command i´m looking for makes a green output :P. Sadly i forget the command; maybe someone can help me.

Best regards

I am trying to integrate the following expression in Maple. It produces the correct result, but not in the format that I want.

BesselProblem := BesselJ(0, BesselJZeros(0, 1)*r)*BesselJ(2, BesselJZeros(0, 1)*r)*r^3;

int(BesselProblem, r = 0 .. 1);

returns the expression

Hi everyone,

I've been able to generate equations of motion for my system. I want to linearize the obtained equations. How to do it? I've been trying to find some example on it, however, haven't been lucky as yet. Can anyone please help me with this? Anticipating a quick reply!

Regards,

Moazzam