I want to differentiate the following (example) sum with respect to each variable.

foo:=sum(x[i]^2,i=1..3);

By hand I solved it like that:

g1:=diff(foo,x[1])=0;
g2:=diff(foo,x[2])=0;
g3:=diff(foo,x[3])=0;
solve({g1,g2,g3}, [x[1], x[2], x[3]]);

This works for i=1..3 but later I want to have it approach infinity. I don't have that much time to do it by hand -- what's a cleaner solution?

I would like to express a matrix in a neat(er) form.  For example, both matrices;

Matrix([[1/4, 1/2], [1/2, 1/4]]);

(1/2)*Matrix([[1/2, 1],[1, 1/2]]);

return the same thing.  I would like maple to print the latter with the factor 1/2 preceding the matrix for better clarity.  Is there a simple command that will do this?

Cheers in advance.

Rob

I was trying to evaluate a difficult integral on maple analiticaly but after about 5 minutes its output is the integral itself. Something like a=a; is it timing out? How can I change this to let it run for a longer period of time? Also I doubt that there is an analytic solution, so I tried to do a numerical computation, with the assumption that (a>0), and it gave the following output:

Also the original expression that Im trying to integrate...

Are there a way to this in calculate this in Maple?

I have a system of linear equations, with two equations:

x[1]+x[2]+2*x[3] = -5

x[1]+x[2]-2*x[3] = 3

a) Find one solution to this nonhomogeneous equationsystem? The answer need to be in vector form.

b) Find the "complete" solution to the homogeneous equationsystem? The answer need to be in para mite based vector form.

What's the API for the MapleCloud?

Would it be possible to upload/download/otherwise-talk to the MapleCloud without using the Standard GUI's palette? If so, how? In particular, could it be done using the Sockets package?

How do I find find an invertible matrix P and the diagonal matrix D such that A=PDP. Are there a Maple command that can do that. I need it to an Maple T.A. exam.

A= 

(−3 0 6)
(0 -3 −6)
(0 0 3) 

  restart; interface(version);
  Digits:=14;
  Classic Worksheet Interface, Maple 12.02, Windows, Dec 10 2008 Build ID 377066

                             Digits := 14

  Psi(1/8): 
  %=convert(%, Sum); # compare the FunctionAdvisor as well ...
  evalf(%);
 
  ...

hi, i would like to know if the classic interfase of maple 12 or higher would work

reasonably well with the 1.4GHz Intel Core 2 Solo SU3500 processor, 2GB of RAM.

if not, what would be the minimum requierments in terms of processor.

thanks,

santiago

As an example, how can I overlap the timing of these two pointplots in the same plot?

with(plots);
a := animate(pointplot, [[[3, 2], [2, 5], [5, 2], [5, 5]], transparency = A], A = 0 .. 1);
b := animate(pointplot, [[[2, 2], [4, 5], [3, 2], [3, 3]], transparency = A], A = 0 .. 1);
display(a, b, insequence = true, view = [0 .. 10, 0 .. 10]);

I want the second plot to appear 2 seconds later as the first plot is still fading away. 

Hi,

I wish to declare the diffusion coefficient in the Fick's diffusion law as constant and solve numerically.How do I declare constants for a pd to use in pdsolve?I also have some constants in my boundary conditions.

is the PD and,

Hello

I have a matrix consisting of 4 variables. I want to define the values of these. Example:

A:=Matrix(2,2,[a,b,c,d]);

I am looking for an easy way to put a=0, b=0, c=0 and d=0. If I just use

A:=Matrix(2,2,0);

the variables are replaced by zeros, and not assigned zeroes as values. I know I can do it manually (by a:=0 etc.). Is there an easier way?

Morten Rask

can any one tell me what mistake i made, why there are 3 error mesaages: unable to match delimiters. untable to store my data, and independent and dependent data do not match????

Hello

I want to create three matrices, multiply two of them, equate the result to the third, and extract the individual matrix element equations:

A:=Matrix(2,2,[1,2,3,4]);

B:=Matrix(2,2,[2,3,4,5]);
                      
C:=Matrix(2,2,[a,b,c,d]);

I have two symbolic expressions which I think may be equal, one simpler than the other. I'm trying to use "is" to ascertain the equality. I tried things like:

is(expr1=expr2) assuming beta>0 and r>0 and d>0;

which returns false,

but this is what the difference between the two expressions looks like for constellations of parameters:

[okay, so here should appear the graph, but where do I store images and other files in the new mapleprimes?...

Saving a 3D object computed in Maple.  Maple itself has only limited capabilities for this.

There is a Maple library called JavaViewLib that sends the data from Maple to a Java applet called JavaView.

From there it can be viewed and saved in many different formats.

Find all the info at www.javaview.de

The last web page update was 2006, but the server that provides the free licenses is still running.

Mostly JavaViewLib...