MaplePrimes Questions

rsolve({g(m, n) = g(m − 1, n) + g(m, n − 1)},g,'genfunc'(a,b));

why no solution

So I have this long-ish do loop that involves all sort of things incl. running an external program (via system() ) and fitting a nonlinear expression to the result; the loop iterating a parameter for the external calculation.

It would be swell if I could run something like a progress bar that tells how many cycles done and still to go. Even better if I could get at the value of a certain variable that indicates progress of the whole calculation (which is an optimization problem...

I need to integrate the Student-T function which is a function of two variables (nu and t). Maple allows me to use this function through this command:



The integration of this function gives me the probability (p) of certain event (nu is already known):


If I provide the value of X I can compute the integral easily, now the problem appears when I want to...


int(int(int(exp^((x^2+y^2+z^2)^(3/2)),x),y),z) , R:  z <= sqrt(x^2+y^2+z^2)  ,  z<=sqrt(1-x^2-y^2)
what's wrong in my maple code:


first:=simplify(first)assuming y>sqrt((z^2)/2)  ,  y< sqrt((1-z^2)/2);

I want to use a do loop to calculate some values of a function and print out the answers.
The result I want is of the form f(1)=17, f(2) = 21, etc. If I try

for j from 1 to 3 do
print( 'f(j)'=f(j) )
end do;

the j is not evalued and I get f(j)=17, f(j) = 21, etc.

I am now using Maple 15 and 16.



Hi everyone, 

In my research project, I needed to evaluate a multi-variable integration.
int(int(sqrt(x^2+y^2),x),y)  , D: {(x^2+y^2 <= 2*y)  ,( y<=x ) , (x,y >0)}

Dear Users,


Maple is giving the result for the following integration as


int( x/(a^2-x^2), x)  = -ln(-a^2 + r^2)/2  


However, I presume the integral output should be -ln(a^2 -  r^2) /2 


Could any one comment on this issue.


Thanks for your attention.

as i do not know what is nu and omega in beta distribution, can i solve it by equating with mean of real data's mean and stardard derivation, to find nu and omega, but solution of nu is negative, 

i guess this method may be wrong, as result diagram is not fitted with real data

and weibull using this method, can not be solved and said solution lost

what is the correct way to draw it?

Using Maple commands, is there a way to manipulate the following ?FROM: y = a * (b - c) TO: y = a * b * (1 - c/b) I'd like to use a command like expand, factor, isolate, normal, etc.b/b cancels   Just wondered, if there was a way. Thanks. 


    This is a silly quesiton, but I'm stuck on it. I have 4 vectors of length 16. I want to plot the 16 elements in different colours against the vector number (n=1..4). And assign the same colour each time to each element, i.e color( V[7, n=1] ) = colour( V[7, n=3]  ). How do I do this? 



I got this error message while attempting to compute Inverse matrix of symbolic function. 

Error, (in Normalizer) unable to allocate enough memory, computation aborted

I have managed to download data for Nasdaq, NYSE and Amex in Maple. However,
my problem is how do I store the data in a txt file on my desktop in the most optimal way.
I want an mpl file so I can schedul the task manager to run the file each day in the background.
This is as far as I have come:


CSV := proc (Url) local theDLL, URLDownloadToFile, myDirectory, myFile, Destination, DL;


how can i plot the graph of this equation.

V[q](r,θ) = 1/r - 1/(r^2*sin(θ)^2)

considering 0‹θ‹pi and q=1.



I have a polynomial system that I'd like to find ONE solution of (there may be many, so I want the program to terminate after 1 is found, since I only need to know that there IS a solution). In this system, the unknown variables are a_i, b_i, c_i, d_i, s_i, t_i, r_i, l_i, for i = 1, 2, 3, 4. Thus I want the solution in terms of these variables. The system is given below.

q & = \sum_{i = 1}^4 a_i s_i, \\
w & = \sum_{i = 1}^4 a_i t_i, \\

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