## How to draw it?...

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)?.

## assuming and procedure parameters...

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.

## Plotting with units?...

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

## pointplot a family of curves...

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?

## Units...

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

## Undefined values...

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

## Unit simplification...

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!

## Numerical integration...

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

## Maximam number of variables...

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

## Generating Plots and Legends...

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?

## incompatible \$-char...

I was trying to generate a derivative of randomized order in Maple T.A.
It seems impossible to me since the \$ in the Maple syntax of
diff(function,x\$n)
and the \$ in the Maple T.A./brownstone syntax needed to denote a variable are incompatible.

Coding, for instance,
\$n = range(2,5,1);
\$function = maple("diff(x^5,x\$(\$n))");
or
\$n = range(2,5,1);
\$function = maple("diff(x^5,x\$\$n)");
in the algorithm section makes Maple T.A. complain about a syntax error immediately

Coding
\$n = range(2,5,1);
\$function = maple("diff(x^5,x\$n)");
jvm 1 | To Maple --> diff(x^5,x2)
being passed to Maple (taken from wrapper output).

## Locking Subsections...

Hi everyone! I would like to create a worksheet witb multiple worksheets, and I would like to use sections and subsections. Can anyone please tell me how to lock certain sections/subsections closed so users cannot open then? Thanks :)

## Simplify...

Hi everyone! Does anyone know how to get Maple to automatically evaluate expressions to a decimal approximation, instead of printing the value with square roots, and 'pi'? Thanks!

Hi! Could someone please tell me how to : Use hyperlinks to refer to other sections with the same worksheet? Thanks :)

## How to create this list?...

Hi dear members of this Forum,

I want to generate a list which depend on "n";
for n=2 I would like to generate the following list

>[[p1>q1, p2>q2],
>[p1>q1, p2<q2],
>[p1<q1, p2>q2],
>[p1<q1, p2<q2]]

for n = 3 I would like to generate the list:

>[ [p1+p2>q1, p1+p3>q2, p2+p3>q3],
[p1+p2>q1, p1+p3>q2, p2+p3<q3],
[p1+p2>q1, p1+p3<q2, p2+p3>q3],
[p1+p2>q1, p1+p3<q2, p2+p3<q3],
[p1+p2<q1, p1+p3>q2, p2+p3>q3],
[p1+p2<q1, p1+p3>q2, p2+p3<q3],
[p1+p2<q1, p1+p3<q2, p2+p3>q3],
[p1+p2<q1, p1+p3<q2, p2+p3<q3]]

for n=4

[ [p1+p2+p3>q1, p1+p2+p4>q2, p1+p3+p4>q3, p2+p3+p4>q4],..
﻿