## Different colored tickmarks?...

Is it possible for tickmarks to be different colors? For example, say I'm working with the plot

`plot(x^2,x=-1..1,tickmarks=[[-1,-1/2,1/2,1],[]]);`

Is there a way to make the tickmarks at `x=-1/2,1/2` red while making the tickmarks at `x=-1,1` blue?

Or, alternatively, is there a way to turn the tickmarks at `x=-1/2,1/2` into red subticks and make the tickmarks at `x=-1,1` blue?

Thanks!

## define_external custom wrapper...

Hello,

I seem to be having trouble with the define_external command.

I want to call a C-library from maple, and I think I need to convert the maple data in C. So I need a custom wrapper.

But I can't get the simple example from here to work for me. Specifically, I tried this:

## having trouble solving a ODE system...

I am having trouble getting an algebraic solution for a first order four-ODE system. The problem seems trivial to me. However, Maple is taking a very long time to solve it. The system describes a reversible "chemical" reaction that have 4 states. Basically, the system is

C1<->C2<->C3<->O1

where the rate constants are ai towards the right and bi towards the left.

Any suggestion will do.

Thanks!

## convert(expr, Heaviside) error...

Hello all,

I have a question about converting a continuous piecewise function to Heaviside function, which the function includes trunc() in its conditions.

(I found differentiating piecewise function gives me "undefined" at boundary)

When I do that operation (convert(piecewisefunc, Heaviside)) I get the error below.

"Error, (in piecewise/simprootsstep) cannot determine if this expression is true or false: 0 < 183.3333333*Pi"

I noticed, that FileTools[Text][ReadLine] cannot read Cyrillic letter "я" in text files.

My test file containes 6 lines (Codepage 1251):

Николай Петрович ТРУБЛАИНИ
"ЛАХТАК"
Ч А С Т Ь П Е Р В А Я
НЕМОЙ ПАРОХОД  Г л а в а I
Ветер налетел неожиданно. С неимоверной быстротой запенились волны. Они приближались к пароходу, стоявшему в миле от берега. Между реями мачт и в надстройках...

## NullSpace slow and (unable to calculate)...

Hi,

I am having some problems when solving NullSpace when the matrix is somewhat 'complicated'.

Maple seems not able to find the nullspace.

Any hints or possible workaround?

Casper

nullspa.mw

## Nonlinear ODE Package in Maple...

Hello to you all. Pls. i just want to ask you guys about which package in maple can I use to solve nonlinear ODEs Also, can I use the Newtons Method?

## Evaluating Vector in a piecewise defined function...

Hello,
I'm trying to write a function which is calculating a B-Spline Function. Given is a knot vector U=[u1,...um]. What i want to calculate know is the basis function of degree 0 which is defined by Ni,0(u)=1 if ui <= u < ui+1 and 0 otherwise. I tried to do this with two procs which are leading to the same problem:
procVec1 := proc (U)
m := nops(U);
N := [seq(0, i = 1 .. m-1)];
for i to m-1 do

## [bug?]subs not working for (column) Vector...

Hi,

The subs command is not working properly for Vector type, see worksheet.

I can use simplify instead, but that's not what I really wanted.

Casper

## Labels on Plot and Along Axis: Workarounds, Sort...

by: Maple 17

I'm sharing this in the hope it might help someone (my future self being the most likely). Since my suggestions are not perfect and a little messy, feel free to suggest better ways.

I spend a great deal of time tweaking my plots. Oftentimes I want to add labels to the curves right onto the plot. Most of the time it's easy to do. Occasionally I struggle. Sometimes I succeed, sometimes I give up.

Below is an example of the kind of plot I sometimes create. It's not perfect.

## solving high order polynomials (with summation), s...

Hi all,

I am having some problems when solving high order polynomials. When oders are 'high' and systems involve multiple variables, Maple is slow to do so.

See in worksheet for detailed codes.

slow.zip

kappa - gives the vector that i am interested in

sC - a reparameterisation which has 'summation' in it

Aim is to verify that it works (it should!)

## How do I get ride of these Rootof...

Hi,

How do I get ride of these Rootof?

I tried simplify,evala,value,Simplify and ect. Didnt really find anything useful.

I dont care which root they actually take, all I want is one of the roots. So I can then use subs for substitution.

Casper

## Warning: Incomplete separation....

Hi all,

What else could I try if I encounter this error?

Warning:  Incomplete separation.

--------------------------------

I read the pdsolve help page, where it says I should have a solution with this warning, but I got nothing but the error.

## second derivative of a PDE solution...

ptr_mplprims.mwHello,I am trying solve  a travelling force problem with pdsolve, but I cannot obtain the second derivative of the solution. I obtained the first derivative, with help from another post (http://www.mapleprimes.com/questions/80997-Derivative-From-Numeric-PDE-Soln#comment81512). When I tried doing the same thing for the second derivative it didn't work. Any sugestions would be helpful. Thank you!!!

## Make Rule for some equation...

Say I have the equation:

f:=x^5+a*x^4+b*x^3+c*x^2+d*x+e

and I want to introduce an identity namely

x^3:=1

Since

subs(x^3=1,f)

or

eval(f,x^3=1)

doesnt work I wonder what is the most elegant way to implement this?

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