hxdhgghehddjhcjhrh

Thanks, so now I specify the value for M, ie M=1, but still error :(. What should I do now?

hi i have one probleam:i want solve one pde

(1/r)*(d/dr(r*dT/dr))=(1/ß)*dT/dt

ß is cte.

T=T(r,t)

Hi,

I need help for the following. I have system of ODE as follows

Hello

 I wish to solve nonlinear PDE equation numerically  in u & v coordinate . where u=t-x, v=t+x . we note x=(v-u)/2.. 

pde := diff(u(t,x),t,t) - diff(u(t,x),x,x) + x^2*u(t,x);  

 We need only initial condition let f(u)=sech(u) & g(v)=sech(v). So u((i,0)=f(ih), u(0,j)=g(jh) 

we summe step size of time j =  step size of spatial i .

the stencil we use , 

There are two parts to this question:

A) Graph the function and approximate any absolute extrema on the given interval.

B) Find any critical numbers, and then use them to find any absolute extrema not located at the endpoints.

__________________________________________________________________________________________________

Both of these parts have to be done using Maple. I tried asking my teacher again if she could help me through this problem,...

Given the pencil of lines a(3x+4y-10)+b(3x-y-5)=0.Find pencil of lines is tangent to the circle x^2+y^2+2x-4y=0?

I am having problems with Maple returning corrct Answer when i use solve

solve([-sin(x) = cos(x), 2*Pi > x and x > 0], x, AllSolutions = true)

result is :

           { x = -1/4 - Pi + Pi _Z5 }   

but we have only 3/4 Pi and 7/4 Pi as solution, but _Z5 indicates all integers. How do i get the 2 solutions  and only those 2?

Kind regards 

Per Kirkegaard

I have defined my own function to implement inverse erf. I am trying to extend Maple so it recognizes basic identities. For example, I would like to Maple to simplify InverseErf(erf(x)) to x when x is real. I've used the following code in a module, but it doesn't seem to work (the evalf does work). Any suggestions?

ModuleLoad := proc()
global `evalf/InverseErf`;
global `erf/InverseErf`;
global `InverseErf/erf`;
`evalf/InverseErf` := proc(x)
local y,z;

I was trying to do some exercises on the Maplesoft site. (This site to be exact: http://www.maplesoft.com/applications/view.aspx?SID=1558&view=html ; 5.3.4. Example 4: Exercise 1:  Modify the above example so that it can be used to graph the sin

This is my question:

Given (1/6)*pi^2-(Sum(1/n^2, n = 1 .. N)) < 0.1e-2, how would would I find the smallest N such that the inequality holds?

I tried using solve command to no avail. Any suggestions?

Hi:

Say I have an expression like this:

a0:=I*(m*x+mp*x-omega[m]*t-omega[mp]*t);

I can factor out x,t and get an expected result:
collect(a0, [x,t]);

But how would I do it if I want to force Maple to act on the argument of exp?

a1:=exp(a0);

This doesn't work:
collect(a1, [x,t])

This will do what I want for this expression but maybe not in general:

I was doing some practice problems for Maple, when I encountered this problem:

My code is

w:=x+2+sin(x+2);

subs(x+2=u,w);

The output however did not change both `x+2`'s into `u`.

The output was: x+2+sin(u)

Any ideas as to why? Thanks in advance.