I use a simple for loop below to illustrate. For each loop through the index value I want to add the result of that loop to a list h. This is how I tried to do it but I can't quite get it because the value in h1 gets updated for each step through the for loop.

for i from 1 to 10 do

u[i]:=2*i;

h:=[]; h1:=[u[i],op(h)]

end do;

So after the for loop is terminated I want to be left with a list h:= ...

The coefficient of determination also known as R^2 tells how good a fit is. If R^2=1 the fit is perfect an if R^2=0 it's useless. But Maple don't have a native function to calculate R^2. I seached and found this: 
http://www.mapleprimes.com/questions/40171-Determining-An-Equations-Accuracy

But it only describe how to calculate R^2 on a 

Why does collect only work sometimes?

I will show with a simple example.  I can do this

a := 5*x^2-4*x+3;
       
                             a := 5 x²  - 4 x + 3
h := exp(x)*a+exp(x);
            ...

How to get the polynomial successfully why return error expect a series valuation 1, what do it mean?

l := [12,14,27,35,46,49];
sl := listtoseries(l,x,revogf);
convert(sl,ratpoly);

with(gfun):
gfun['maxdegcoeff'] := 50:
gfun['maxdegeqn'] := 2:

i use number of balls in each basket to get a list, but all functions return fail? where is wrong? and how to use correctly?
l := [0,0,0,2,0,0,0,0,1,1,0,1,0,1,1,0,0,0,0,0,0,1,0,0,1,0,1,1,0,1,1,0,1,0,2,0,0,0,1,0,0,0,0,0,1,1,0,1,1]:
listtoratpoly([1,1,2,3,5,8,13],z);
listtoalgeq(l,y(x));

l := [12,14,27,35,46,49,31];
listtohypergeom(l,z);
guessgf(l,z);

Hi, 
I'm modeling a magnetic field and I don't know how to plot the corresponding vector field:

For each point  M I have the vector B(M) as a list.
Could you explain me how to transform it as a "real vector" first and how to plot these vectors then??

Thanks in advance! 

Hello!

I've got a question about model integration process.

I've tried to solve quite complex mechanical model and this messages have appeared.

Computing initial conditions...
Iterate re-initialization...
done.
Simulating...
CreateDataRecord: using dsolve method=rosenbrock_dae
Generating configuration 1
Integrating configuration...
Re-initializing after event at t=4.94271387307997e-009...

How could we get module which contain this export, for example

I have

m1 := module export a; end module;

 temp := m:-a;

evalb(temp = a);
 # false
evalb(temp = m:-a);
 # true 

 but how could I get back the module like this

temp2 := getModule(temp); 

temp2;

 # m

evalb(temp2 = m) ;

# true 

Hi,

I'm trying to model a magnetic field with maple.

In order to do that, I compute a (huge) sum and integrals of real and posive numbers.

The problem is that for some points, when I compute the norm of this field I get an imaginary number with a very small imaginary part (egs -2, 27293.1844462+1.42305652280*10^(-84)*I ).

How can I get rid of it?

thx in advance 

Can anyone explain this?

> A := Matrix(7, 7, {(1, 1) = 0, (1, 2) = 0, (1, 3) = 0, (1, 4) = 0, (1, 5) = 0, (1, 6) = 0, (1, 7) = 0, (2, 1) = 0, (2, 2) = 0, (2, 3) = 0, (2, 4) = 0, (2, 5) = 0, (2, 6) = 0, (2, 7) = 0, (3, 1) = 0, (3, 2) = 0, (3, 3) = 0, (3, 4) = 0, (3, 5) = 0, (3, 6) = 0, (3, 7) = 0, (4, 1) = 0, (4, 2) = 0, (4, 3) = 0, (4, 4) = 0, (4, 5) = 0, (4, 6) = 0, (4, 7) = 0, (5, 1) = 0, (5, 2) = 0, (5, 3) = 0, (5, 4) = 0, (5, 5) = 0, (5, 6...

Mapleprimes has really painfully slowed down in the last day.  What's happened?

After I post this message mapleprimes will refresh and refresh a few times (not that it hasn't done that before) but now that it's slower again, it's quite frustrating, I can't post even check primes for at least 15 minutes after a post.  Back to the old days of primes 2 I guess.  I can't tell if mapleprimes making progress but it seems like were going backwards just as much as we go forwards.

Good afternoon.

I have a problem.

i want ot add the procedure friccion(x1q1(t), x2q1(t), 1) into the dynamic system equation, because the fricction change with the velocity.

I don´t know how can solve that

Please help me o give some ideas.

thank you

30-03-2011-robot-man.mw

My question is very easy I have  and I want   how could I ask this to maple?

In particular my expression is 

Hello.

I can't find a very "basic" tutorial about data file plotting and I have very simple questions.

Assume that we have a file that contains :

0.5 0.2

0.3 0.9

0.4 0.1

0.7 0.6

The first thing to do is to read data. I have no problems for that :

mydata:=readdata("test.txt",2)

Then

mydata=[[0.5,0.2],[0.3,0.9],[0.4,0.1],[0.7,0.6]]

Question n°1

I draw tiles, i want to utilise un plot of an array 2 dimension. But i have had a good solution ?

I input data by hand :

> with(plottools);
> with(plots);

 > a := proc (i, j) options operator, arrow; polygon([[i, j], [i, j+1], [i+1, j+1], [i+1, j]], color = red) end proc; b := proc (i, j) options operator, arrow; polygon([[i, j], [i, j+1], [i+1, j+1], [i+1, j]], color = green) end proc;