Hi,

I’m quite new to maple so I need a bit of help. I am trying to solve the Navier-Stokes equations (NSE) in 2D along an infinite channel  which has fluid being sucked out of it through the walls.

∂u/∂t + (u∙grad)u=-(1/ρ)grad(p)+ (nu)grad^2u

I need to write down the NSE.
u=(u,v,0) is the velocity of the fluid.
The flow is steady so ∂u/∂t=0.
I need to take the curl of the NSE to eliminate the pressure term as taking the curl of
gradp=0.

hi,

I have two columns as seen below. I want to sort column Y in descending order but I want to                                                                      return the the X value of such a Y value as well.

<p>Hi, I need help.</p>

Hi, Would appreciate some help - Re: checking solutions of the first order DE in Maple? Tried to search in Help, but could only find solutions to 2nd order DE. For instance, when I enter: > ode := diff(y(x), x) = y^2*exp(x); d 2 --- y(x) = y exp(x) dx > solve(ode); I get: Error, (in solve) cannot solve expressions with diff(y(x), x) for x > Many thanks! Antonio

Hi all,

 

What am I doing wrong?

Hi guys. I hope i do this correctly... So I want to have this: f(p) := proc( p ) if p::even then print(((((p)!)/((2^(p/2))*(p/2)!))^2)) else print(0) end if end proc: as an initial condition, b[p,0], for an array, b := array(0..500, 0..500). It doesn't work if I just do a for loop. At least I don't think it works; say I do for p from 0 to 500 do b[p,0] := proc( p ) if p::even then print(((((p)!)/((2^(p/2))*(p/2)!))^2)) else print(0) end if end proc od: Then when I try b[4,0]; it just returns b[4,0], and not 9.

Hi all,

While working with the method of Frobenius to solve a second-order homogeneous equation,  I stumble at a point where I have to divide two series.

You will find in the attach worksheet what I mean.

Frobenius division.mw

Any help would be appreciate.

Thanks in advance

Mario

Please help me check the attached worksheet. I defined the target functions by two ways: factor one parameter delta out in two terms or totally expand them (you can uncomment the definition to play by the remarks). The plots drawn or the evaluation done in the end are quite different. When Maple do maximization or evaluation, what is the difference between these two "algebraic identical" forms?

 

for Thomas Calculus 11.2.19, the sequence below  Maple repeats back the sequence again.  how do i get it to show an EXACT ANSWER like the 3rd statement below ?

thanks.

 

 I hope someone may be able to help with some operational problems in moving from v2.5 to v3. Yes, I know .....but there is a case for not being totally up to date. I have ironed out any technical (ie mathematical) problems but the operation of such an expensive but poor piece of software is staggering. We have been using it for three years and know all the groans about 'early' versions

 

Hi all,

 

I have

I know this is petty but it is driving me mad....

In maple 11 if you made a change to character style (via format\ styles\) it used to be saved and remain changed if you closed maple and reopened another day. Now the changed styles only stick for the worksheet in which you made the changes.

How do I make styles stick long term?

thanks!

Is there a way to plot a single graph with multiple functions, where I can set a different scale for each function?

I want to get something similar to this:

I can plot multiple functions in one graph with display(); but it is the multiple scales part that's giving me a headache...

 

Thanks

Thomas

Hi,

I was wondering if there is a way to return only the subscript of an element in a sequence.

Essentially I have something like t:=a[[1,2]] and I want the list [1,2] to be returned. I can't think of anyway to do this. For instance solve(t=a_x,x)...

 

Any help would be appreciated.

 

I have to create a n-dimensional interpolation to get function to use it in a numerically solved differential equation. T:=(x,y)->ArrayInterpolation(Ranges,Img,[[x],[y]],method=linear)[1][1]: T(3.3,4.1); 1.30999999999999983 int(T(3.3,x),x=0.0..1); Error, (in CurveFitting:-ArrayInterpolation) invalid input: coordinates of xvalues must be of type numeric