## Test my own analytical pde solution...

Hello,

I am getting into the pdetools, in particular the analytical options. I saw that I can test the MAPLE solution to a pde, but I want MAPLE to test my solution,  how could I do that, MAPLE just substitutes my solution into the pde without differentiating and simplifying.

Thanks,

Daniel

## Force collect an almost common factor...

Hello everyone,

I like to force following:

a/(a+b) --->  1/(1+b/a)

I know that collect is a powerful tool that is actually capable of doing such things. In a similar (old) thread, it was suggested to use a function in the last part like

collect(expression, varialble, (x->something)@factor)

but I don't understand what exactly this means. Any help?

another related question is, is the collect command available as right-click option?

## Calculate percentage change in a solution?...

I have a differential equation having a parameter say 'a'.

If I increase 'a' by 10%, got change in the solution as well.

How to calculate change in percentage in the solution?.

Thanks

## The engine behind fsolve...

Hi everyone.

Does anyone know what engine is behind the fsolve command? As we know fsolve can solve the sets of equations even without any initial guesses. Is it working based on GA or another global optimization techniques?

Appreciate any help.

MJ

## Factorization List Problem...

I'd like to take the output of ifactor(n::posint), the prime factorization of n, and index the terms of the product to a list. ie: ifactor(256)=2^8 so [2,2,2,2,2,2,2,2]. or 135 -> (3^3)(5)->[3,3,3,5].
Any suggestions?

## Trying to maximize function with binomial, maximiz...

So I've got this function here:

I'm trying to maximize it over the reals using Maple 16. I know from the graph that the maximum is somewhere between 109 and 111. I tried using maximize( f(x), x=109..111) but it keeps giving an overflow exception. How would I go about maximizing this?

## Phase change...

Hi everybody,

Does somebody has an idea about how to model the temperature of water during freezing ?

I mean, if you consider a certain mass of water and you put it, for example on a fridge. I don't consider the convection but only the diffusion, and I would like to model, if possible with an animation the temperature of the water (as a cube for the shape).

Normally, during the freezing I should observe a decrease of the temperature, then a freezing...

I have written a procedure to overload a new "Subs" function. It uses a seq of equations as its first argument followed by the object to act upon (yes, it is to have subs functionality on these objects). I find the overloading works when I have just one equation in the argument list, but with more than one it never calls any of the procedures. The code worked with multiple equations before I overloaded it (i.e. the first proc was verified by itself). FWIW the objects (elemt or bm...

## Does maple 16 work with Visual studio 2012?...

Does maple 16  work with Visual studio 2012?

## full evaluation needed...

Check these 3 code lines. a,b are some reals.

s:=a/b

g:=(a,b)->s

g(1,2)

yields a/b

Is it possible to make Maple spit out 1/2, maybe with some default setting command? I still want to keep the function call format g() , so no eval(g(),...)

## Matrix with two unknown parameters...

We are a group of students trying to solve this, we can't find a way.

We are given the system of equations

ax + y +z +u =  1
x  -y  -z +u  = -a
y +z -au = b
x- y +bz +u =-2a

For what values ​​of a and

## How do I receive out put this integrate?...

When I input int(sin(x)^4,x); I received -1/4*sin(x)^3*cos(x)-3/8*cos(x)*sin(x)+3/8*x. How do I receive 3*x/8 + 1/4*sin(2*x)+1/32*sin(4*x)?

## Shortest path using while loop?...

Modify the shortest path problem by rewriting a procedure Path, non-Recursion
that print out the shortest path from a to e base on the information from
setShortestDistNode
input:  destination "e" and setShortestDistNode
output:  path : a -> b -> d -> e the total cost: 9
hint: copy everything that we did in shortest path problem, and rewriting a procedure Path, with while loop

I'm assuming this means this, but...

## How do I solve contact relationships by rocking vi...

I want to simulate these contact relationships by rocking vibration as shown in Fig.1.

↑Fig.1

The two boxes (rigid body) should be contact theoretically.

However, my model did not contact.

Here, msim file is attached.