## 2 Badges

3 years, 345 days

## thanks a lot...

i hace another question how do i calculate this sum in maple 18  thinks

## thanks a lot...

thanks alot

I am very grateful to you

## Thank you for your help...

Thank you for your help

please i have other question if you can halp me

How can be written this system of eqautions such that the variables (r,Z,U,V,W,S) depends to theta

thanks Download problem_1.mw

## Thanks...

@acer

hello thanks for your help

Please how do i find this reslut in maple

## @Carl Love  All information in thi...

All information in this papers

## how Classification of equilibrium point...

please

how  Classification of equilibrium points in R^3

## maple...

i did not understand this step

## maple...

hi

What is the difference between Maple 18 and Maple 2018

## thank you...

thank you for answering my questions about the sum
I have another problem in the compilations

 > restart; randomize():

Define S and test it:

 > S := n -> sum( sum( a[i, j]*x^i*y^j, j = 0..n-i), i=0..n);
 (1)
 > S(2);
 (2)

Define A and test it:

 > A := n -> add( add( a[i,j]*x^i*y^j, j=0..n-i), i=0..n);
 (3)
 > A(2);
 (4)

Assign values random values to the elements  in the array `a`. (i have problem)

 > N := 10: a := Array(0..N, 0..N, (i,j)->rand(-1.0..1.0)())

Problem: te

sting S with n = 2.

 > S(2);
 (5)

Hmm, no longer symbolic.

As opposed to A:

 > A(2);
 (6)

S can't be plotted even if the function is delayed:

 > plot3d( 'S(10)', x=0..1, y=0..1)

But this does work.

 > newS := (x,y,n) -> sum( sum( a[i, j]*x^i*y^j, j = 0..n-i), i=0..n);
 (7)
 > plot3d('newS(x,y,10)', x=0..1, y=0..1);

A behaves as a I would expect.

 > plot3d(A(10), x=0..1, y=0..1)
 >

you can calculate this sum by this program

-2 + x - xy + x2 + 2 y2

Download Sum_vs_Add_(1).mw

 Page 1 of 1
﻿