Hi Maple's experts, I would like to draw inequalities in R^3. Is there a similar command (to "inequal") for more than two unknown variables?. Thanks in advance, JJ

Hi.
There is a command called genvecs in mathcad and i wonder if there is something similar in maple.
Or can somebody tell me how to make the same in maple.
Regards M

has someone a sheet about percolation theory ?
I put a very simple one on my blog:

percolation
Can maple do this ? and how .... I know you can do the graph, but I need to know if maple can do my problem.
ex: Y(t+1) + Y(t) = (-1)^t
and y(0) = 2

Hello, How to select the maxima of the list H1:= [[8,9,11],[8,10,11],[5,10,6]]? I do mean, I would need to select the maxima among the first components (8,8,5), second components (9,10,10) and third components (11,11,6). I would also need the index of this elements that are in the maxima set. Leika

I want to draw the set of points that satisfies the following sets of inequalities: x+y>=50; #(1) x+z>=50; # (2) y+z>=50; # (3) subject to x+y+z=100; I tried: >with(plots): >implicitplot3d( {x+y+z=100, x+y>=50,x+z>=50,y+z>=50}, x=0..120, >y=0..110, z=0..115, axes=normal); 1. How could I do to see exactly the required set in a different colour? It would be possible to give different colours to each constraint (1-> yellow, 2->blue, 3 ->red)? 2. It would be possible to avoid the three dimension space and to represent everything on the plane x+y+z=100 (that is, to represent the inequalities 1, 2 and 3 only on this plane)?.

Hello,

I am looking for an explanation for the following behavior :

> f := proc(x) somefunc(x) end proc:

> a := table([variable=z]):

> f(a);

somefunc(a)

> f(a) assuming z::real;

somefunc(table([variable=z]))

Why is 'a' replaced with its corresponding table in the second case? And is it possible to use the name 'a' in the return value?

-- Thanks for any reply,

Franky.

Is it possible to use units on functions/data that will be plotted? I have tried but it seems to flag an error. If it is not allowed, what is the best way to strip the units before plotting? Thanks, Dgiznya

I can pointplot a single curve if I select a single element from the list below. Is it possible to use all the elements of the list and plot several curves on the same graph?

Hi! How do you compare values with units attached: eg. this error message displays x := 4(m) y := 5(m) if x <>

hi again! Is it possible to disregard part of an equation if the denominator is zero? Thanks.

Hi, I was just wondering whether it is possible to limit the simplification of units to display N and mm rather than kg/s^2. Also when i square the units and then square root them is it possible for it to simplify the square root without right clicking and selecting simplify? Thanks!

Hello!

I´m Trying to do numerical integration for a function defined by a product of characteristic functions. I either receive the message " Error, (in unknown) too many levels of recursion " or "error, (in evalf/int) unable to handle singularity". What should I do?

f_1:=(x,y,z,w)->piecewise(x+w > 0 , 1);

f_2:=(x,y,z,w)->piecewise(x*w - y*z > 0,1);

f_3:=(x,y,z,w)->piecewise((x+w)^2 - 4*(x*w - y*z)<0,1);

prod:=(x,y,z,w)->f_1(x,y,z,w)*f_2(x,y,z,w)*f_3(x,y,z,w);

I want to integrate prod, with all four variables ranging from -1 to 1.

Thank you, Bernardo

Hi, I am trying to call a Matlab function from Maple. The Matlab function requires 33 input variables, but when I call this function with this many variables I get the following error message:
"Error, (in ExecuteCommand) Matlab command string is too long"
My objective is to maximize this function using GlobalSOlve but first I want to just call it. I would appreciate if someone can help me with this.
Cheers
Saqib

Hi!
I have a two part question:
I am plotting a matrix as multiple graphs: column1 v column2, column1 v column3 etc
I have a worksheet set up so that some of the graphs can be completely equal to 0. I am plotting all the graphs on the one set of axes for comparison, and so the null graphs don't appear. However, I am having problems getting a legend. I only want to display a coloured legend (each plot is a different colour) for each graph that is non zero. How can I do this?
Second part, I have created a text box next to the graph that displays the names of the non zero graphs as strings. Can I make these strings the same colour as their respective graphs?