I am new to Maple (I have Maple 11 student version)
I tried to simplify atan(tan(x)) and nothing happens
Also atan(sin(x)/cos(x)) does not simplify.
What is the trick to simplification?

Dear all:
Inside maple, I want to call C program which is compiled using cygwin & gcc. I did a very easy one for testing.
int _stdcall add( int num1, int num2 )
{
return num1+num2;
}
and then gcc -o add.c && gcc -shared -o add.dll add.o
However, this doesn't work. Maple continue to load the DLL forever......
Does anyone know the reason?
I did it with Visual C++ with VC specific options and it works just fine.
Thanks,
Peter

the equation y'=1-y(t)^2
how do you construct the de plot and find the equilibrium solutions

I want to have a solve command in a loop like this:
for j from 0 to 10 do s[j]:=solve( {f[j]=0 , g[j]=0},[ a[j] , b[j] ]); od;
where f[j] and g[j] are complex exponential functions of j and a[j]& b[j] e.g in a very simple case:
f[j]:=a[j]*exp(I*2*j)+b[j]
after such a loop Maple just solve s[0] and for other j's a warning message appears saying: "solutions may have been lost". And amazingly this warning seems very correct for when I put the solve command outside the loop,like
solve({f[2]=0,g[2]=0},[a[2],b[2]]);
it simply solves it!
I don't know how I can overcome this problem?!

Hello,
first post here, thanks for letting me on the forum.
I am trying to visualize fourier approximation. This means that I want an animation of the several functions I get (the first only uses cos(x) and sin(x), the second one also uses cos(2*x) and sin(2*x)...)
I managed to do this:
[quote]
restart;with(plots):f:=piecewise(-Pi

When you call call_external like call_external(p1,p2,p3,p4) what do the four parameters mean?

Hi guys, do any of you know how to differentiate a matrix, i have the command
A:=Matrix(2,2,symbol=k):
I want to treat the elements k[1,1]..k[2,2] as variables, and then differentiate the matrix
with respect to say k[1,1], and so on. How can i do this?

I am using the ODE analyzer to look at the numerical solution to a second order ODE of the form 0=-uc'-kc+Ec" with u=.3, k=.0001 and E=10, and with conditions, c(0)=2 and c'(20,000)=0. When I try the solve numerically, I get an error message saying "unable to convert input to a first order system. Recieved error: too few boundary conditions, expected 5 got 2." What am I missing?

I am trying to solve the following system of PDE's

dn := diff(n(x,t),t) = d*diff(n(x,t),[x,x])+n(x,t)*(r(n(x,t)+m(x,t)))*s[1](C[1](x,t))-n(x,t);

dm := diff(m(x,t),t) = d*diff(m(x,t),[x,x])+m(x,t)*(r(n(x,t)+m(x,t)))*s[1](C[1](x,t))-m(x,t);

dc1 := diff(C[1](x,t),t) = d[1]*diff(C[1](x,t),[x,x])+P[1]+(n(x,t)+m(x,t))*p[1](n(x,t)+m(x,t))+H*m(x,t)*p[1](n(x,t)+

m(x,t))-(P[1]+p[1](1))*C[1](x,t);

with initial and boundary conditions

IBC := n(x,0)=piecewise(x^2<1,0,x^2>1,1),m(x,0)=piecewise(x^2>1,0,x^2<1,1),C[1](x,0)=1,

C[1](infinity,t)=1,n(infinity,t)=1,m(infinity,t)=0,n(-infinity,t)=1,m(-infinity,t)=0,

I have made some lists named K[i], i= 1 to 48, with matrices, but this doesn't make maple happy, and I get 'Error, invalid subscript selector'. The problem is obvious that K[i] is taking element i in the list K, and I get problems when I want to take list K[i] and look at element j.
So, how do you give lists names with indices?

When Tutor suggests a 'change in variables' and next step is applied, is there a way to get Tutor to show the substitution for variable u as well?
thanks

This is a new user question.
mapleTA3.01 is installed on an Ubuntu linux server here at maths.uwa.edu.au
and on SUSE linux at maths.curtin.edu.au across the river here.
We have classes (around 1000 students at each institution) about to start soon
and have been forced by the maple vendor to switch from AiM to mapleTA.
(And, no worries, we will try. The March start date is scary.)
We are having problems with most maple-type questions, displaying maths.
Intermittently, the gif for the maths does not seem to get written.
These are from the maplesoft Calculus questions. It isn't in anything peculiar

Hi,
I have two questions, which should be relatively simple to solve.
First of all, how do you name the axes in a plot?
Second, how do you change the dimensions of a spreadsheet in maple? For example, if I wanted a 500 by 2 spreadsheet, how would I go about getting it?
Right now the spreadsheet maxes out at 100 rows
Thanks for your help
-Evan

Hi how can i retrieve the 1 in x[1] in a maple program or 2 in y[2]?

I have a program that may call Compiler:-Compile to speed up the calculations, but after the
program terminates the DLL that was generated still exists on disk. Every time I call on the
program, I create a new DLL without deleting it. If I keep calling my program, the disk will get full of temporary DLL's until the disk gets full. I know how to delete using FileTools:-Remove, but I get the "permission denied" error message. I assume that it is because Maple 10
is still using the DLL, so how do I get Maple to free the DLL so that I can delete it?