## Would like to contact Maple users in the Los Angel...

<p>I live in Los Angeles near UCLA and was wondering if there are Maple users in the neighborhood of Los Angeles who would be interested in forming some sort of local Maple Users group.  I would appreciate hearing from possible members,</p>

## Big Big Integral Problem...

I got a big problem with one kind of integral function. Now, I am using Maple 8 or Maple 11 to get some results from my research topic. However, when I took three times integral like :

f:= Int(exp(-t^2),t = 0 .. infinity)+Int(Int(2*Int(.1*exp(-.25*(u-s-k)^2)*exp(-(-.5*u-.5*s-.5*k+t)^2)*exp(.25*(u-s-k)^2)*exp(-.1*k),k = 0 .. u-s)*exp(-u^2)*u,u = s .. t),t = 0 .. infinity);

After that, I try to draw the grahp of the above equation.

plot(f,s=0..1);

## Generating optimized C code from an array...

Hi everybody.

I'm using Maple these days to generate C code. More precisely, I use Maple to calculate high order derivatives. For example, I know that :

dt( u(x,t) ) = a(x) * dx( u(x,t) ) + b(x) * dx( p(x,t) )

dt( p(x,t) ) = c(x) * dx( p(x,t) ) + d(x) * dx( u(x,t) )

and I ask Maple to calculate the 5th time-derivative of u using these 2 properties. But in fact, I use 8 variables instead of 2 and PDEs are far more complicated.

Finally, I get thanks to Maple expressions of time-derivatives for my 8 variables.

## error...

Hi can anyone help me with this error please.

I don't knw wot it means or how to solve it:

Error, (in fprintf) integer expected for integer format

I gt the error for this line of code:

printf("No Roots Between The Interval %d \n",[a,b]);

## how to plot the expression...

I got an expression f:=R^3/(z^2+R^2)^(3/2); and would like to plot f as a function of (z/R), not z. Here R is a parameter. Could someone give me a hand?

## Integrate DeltaT...

Hi, I'm traying to maje a double integrate of P(A(t+Deltat),A(t)) , the first one in in untion of dA(t) and the second one is in fuction of dA(t+ DeltaT). How can I indicate in Maple Deltat?  Is it possible to integrate in function of A(t)?

All variables are constant, except A(t) and A(t + Deltat),

> F:=proc()