Hi

I have problem to plot(2D)  some equations that have 3 variables (to obtain one diagram with some curve ).

like this equation

ln(2*s*t+2*s*x*sqrt(t)/sqrt(pi)+x^2)-2*s*(arctan((s+x*sqrt(pi/t))/sqrt(2*pi*s-s^2))-(1/2)*pi)/sqrt(2*pi*s-s^2) = 0

I should plot x v.s t for s=0.01,0.005,0.003,0.002

please  help me to understand how can plot like these equation.

thanks

to compute a maple program using the paper posted in the reply 

Hello again,

for a paper I need to cipher and decipher with the standard RSA-procedure.
My problem is, that my numbers are really large.

As normally it's just, given a public key (e,N) and a private key (d,p,q), p,q are primes, and the plaintext:

encrypt: b^e mod N = c

decrypt: c^d mod N = b

That works cause ed = 1 mod (p-1)(q-1) (Euler's Phi-Function) and gcd(e,N)=1

With little numbers thats no problem. But increasing e and N, i thought using the powmod function will help:

b&^e mod N = c but

c&^d mod N <> b.

So it doesnt work anymore and I really dont get why...

thanks for help, I'm really lost here..

  Solving trigonometry Equations  sin^2(2x)-cos^2(8x)=0.5cos(10x)

Hello,

I have a question. I have to compare the times and steps taken by an algorithmus (which contents a loop).

So for time there is the time()-function, right? And is there any similar function for the steps taken?

So far i use a variable increasing by 1 each time, but i think there is an more elegant way to do it, which I just don't know.. :D

Thanks for any help!

hi everyone.how can i write a function or procedure or summation so that i can write down the following polynomial ? i just want to create a set of polynomials which their summation of power ( power of x + power of y ) be less than three or equal to three ? the coefficients priority is not important , for example it is not important that a1 multiplies to x or y , i just want to create this polynomial with some coeeficients. tnx for help

Download problem.mw

Hello,

Good day.

How to avoid float(undefined) for v3, v4,v5 in this problem.

Thank you in advance.

Try_for_Second_Grade_Fluid.mw

Often, I'd like to use variable names that look like expressions. Is there a way to convert them to some form of inert form or as some sort of literal (so that they are not a mathematical expression) ?

Such as,

a1⁽²⁾

Can't type it here, but I wanted 'a' subscript 1 superscript (2). I'd like it to not be a1 squared.

Basically, I'd like the subscripts and superscript to not mean anything mathematically . . . And, I use a1^(3), a1^(1), a2^(1), a2^(2), a2^(3), b2^(3), etc.

Thanks, for any suggests.

Cheers !!

Hi,

I am tring to  solve a set of boundary layer equations with boundary conditions using Runge kutta Felbergh 45. When I executed the file,  the following message appear " Error, (in dsolve/numeric/bvp) initial Newton iteration is not converging". Can someone help me on this matter?

Sorry for the bad format, maple input is not working.

In particular,from an expression, something like

 Int(x*f(x), x = 0 .. 1)+ Int(x, x = 0 .. 1/3)+3* Int(x*f(x), x = 0 .. 2/3)

I want to extract 

x*f(x)+x+3*x*f(x)

That is all the integrands occuring in the expression. GetIntegrand helps to find the integrand but only for one integral, how do I do it for an expression like above.

I tried to apply following approach

subs(sin(c::anything)=c, sin(x)+f);

and the output was

f

I was expecting to get only 'x+f' for output.

EDIT 1: 

Thank you so much for your help. You guys answered exactly what I asked for. I needed this to do something different but I should have been more careful. I realized, I could not get that part now. This is what I actually need to do, if

A:=-(5/8)*x*(Int(f(x), x = 0 .. x))+(5/24)*(Int(f(x), x = 1/3 .. x))-(1/4)*x*(Int(x*f(x), x = 1/3 .. x));

then I wish to get a function, g(xi),

g(xi)= -(5/8)x*f(xi) ;   if 0<= xi <= x
                                                  (5/24)*f(xi)-(1/4)*x*xi*f(xi) ; if 1/3<= xi<= x

Notice, all the terms after integral should use variable 'xi' and terms occurring before integral remains as it is.

This is the simplest method to explain numerically solving an ODE, more precisely, an IVP.

Using the method, to get a fell for numerics as well as for the nature of IVPs, solve the IVP numerically with a PC, 10steps.

Graph the computed values and the solution curve on the same coordinate axes.

y'=(y-x)^2, y(0)=0 , h=0.1

Sol. y=x-tanh(x)

I don't know well maple. 

I study Advanced Engineering Math and using maple, but i am stopped in this test.

I want to know how solve this problem.

please teach me~ 

IT IS EULER's method

Sum(a^(k/a^k), k= 1..n);

Hi,

I am new to Maple and have a problem when solving three equations with three variables. But when  I plug in into solve function then it gives no answer.

eqn1 := 24900 = A*exp(-X*1.293995859*10^22)+A*exp(-Y*1.293995859*10^22)+5852.27;

eqn2 := 6000 = A*exp(-X*1.293995859*10^22)+2422.929937;

eqn3 := 19100 = A*exp(-Y*1.293995859*10^22)+8275.199937;

Variables are [A,X,Y]

Hi there. I'm Student

i want to know how solve this problem.

please teach me! 

y'=(y-x)^2, y(0)=0, h=0.1

sol.y=x-tanh(x)

how solve this problem for maple? 

please teach me~

Hi!

I want to select 'Export using shapes for greater fidelity' under option, Export. But I can't find the tab ' Export to PDF-Format'. I'm using Maple 18 on a Mac-computer. 

Can anyone help?

Thanks

Esben