## 110 Reputation

16 years, 129 days

## lists or functions?...

Maple

Hello,

I have a program where a system of DE's is solved numerically then some calculations are done to the result..

let the solution of the DE's be y(t) then we have:

A(t) = some function of y(t)

B(t) = some function of A(t)

C(t) = some function of B(t)

Those A, B and C are actually complicated formulas including sums, matrices... etc. So it's not possible to combine them in one function.

Then we'll plot C for a specific period of time.

My questions:

## Combine two plots?...

Maple

Hello,

How can I combine two plots so that one is above the other and they have the same x-axis.

Here's an example of what I want.

I tried array of plots, but in this case each plot has its own axes and they are side by side horizontally.

Any other suggestions?

Thank you

## merging two lists?...

Maple

Hello,

Is there a way to merge two lists?

For example, to merge:
a=[[1,2],[3,4]]
b=[[5,6],[7,8],[9,10]]

and get:
[[1,2],[3,4],[5,6],[7,8],[9,10]]

Thanks

## convert a list of equations to pair of r...

Maple
"Equate - convert a pair of rectangular objects into a list of equations" How can I do the opposite? e.g. converting [a=2, b=4, c=3] into [2,4,3]

## time-dependent random numbers?...

Maple
Hello, I want to solve a DE in x(t) where the RHS of the equation is a random number that changes with time. For example: x''(t) + 10 x(t) = f(t) where f(1)=1, f(2)= 6, f(3)= -2...etc. I tried to use ran() but it solves it for a fixed random number, while I want it to be time dependent . Is there a way I can do that? Thanks
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