9 years, 12 days

## Strange digit problem...

sometimes Maple gives me the result in strange form, for example:

(2.*I)*q*r

I is the complex number. why is there a dot behind 2 ? How can I simplify it to

2*I*q*r ?

Many thanks,Kyle

## Strange subs problem...

Maple 16
`Dear experts, I have problems about "subs", see below`
`> restart:`
`> assume(A>0): interface(showassumed=0):> f:= A^2-2*sqrt(A^2+1)+1;`
`Now I want to replace A^2+1 to M^2, so idealy, what I want to see is`
`M^2 + M`
` `
`When I do:`
`> f2:= subs(A^2+1 = M^2,  f);`
`Maple shows `
`A^2-2*sqrt(M^2)+1`
`Maple cannot replace A^2+1`
` `

## Check if an array is empty...

Maple 16

Hi, experts

I have an array which is empty, say

f:= []:

is there away to check if it's empty? I want to do something like in Matlab:

if isempty(f)

......

end

Many thanks

Kyle

## Solve multiple variables from one equati...

Maple

Hi, experts,

I have an equations:

How to solve a, and b? It's easy to know that a = 2, b =5 though.

Many thanks!

## Simulation of Brusselator with diffusion...

Maple 16

Hi, there, maple built-in help just has an example of Brusselator model in 1D case. But how can I intepreter the diffusion terms that Brusselator has in 2D case? Could you please give me an example of the code to run Brusselator simulation in 2D case?

Brusselator model:

http://hopf.chem.brandeis.edu/yanglingfa/pattern/bruss/index.html

Thank you

Kyle

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