Hi all,

I have a function defined as a sum:

with(PDEtools): mfx:=(x,y,ufx)->sum(ufx[k]*(x-x[k])*(y-y[k]),k);

I want to declare mfx(x,y,ufx) so that it would appear as mfx in subsequent displays. However, when I tried

declare(mfx(x,y,ufx));

Maple tells me that "Error, (in PDEtools:-declare) cannot declare objects as sum(ufx[k]*(x-x[k])*(y-y[k]), k)".

How can I solve this problem?

Thanks.

I am trying to do a Bode plot of two functions. I have the dynamic systems package but when I call the routine Bodeplot no plot is generated. Why? I do have MapleSim but I wanted to use this package with MAPLE 12.01 only. Any ideas? Otherwise I will use MatLab. Thanks. David Parker

I am having a problem differentiating a function. I have a fluid in a channel with moving walls corresponding to y=a(t) (upper wall) and y=-a(t) (lower wall). The fluid is driven by suction out of the walls. The speed of the fluid being sucked out of the walls is the constant v_w. I am using the variable eta=y/a(t) to model the fluid. y is the normal direction to teh channel and x is the streamwise direction of the channel. So I have

x=streamwise direction of the channel

y=normal direction of the channel

a(t)=height of the channel

v_w=constant

This is inspired by MapleTA, but applies to Maple in general.  According to the documentation, bitmap plot devices do not allow for font selection, meaning the recommended textplot(...,font=[SYMBOL]) fails to render greek characters such as π in plots which are rendered for embedding in web pages.  This seems like a gaping omission, so we're hoping we've just missed something here.  Is there any way to get the symbol for pi onto a jpeg or gif plot?

Hi all,

I have little (almost zero) experience with Maple. Nonetheless I wish to use Maple 8 to solve a set of 5 equations for 8 unknowns.

At the moment my strategy is to input each equation, make a set of the 5 equations, and then use the 'solve' command to determine the variables. I then refine the answer using 'allvalues' and 'evalf'. Is this the best approach?

Any help or guidance on this is greatly appreciated.

I'm a brand new user. 

Maple 12, Windows Vista, Integration Tutor.

When viewing the steps in the solution, Maple does it's own u-subs ("change of variable").  Is there any way to see what it is setting "u=?"?

It's very difficult to follow the steps when I can't tell what it's subbing out.

Also, within the same tutor, it doesn't seem to like to intigrate to infinity.  It tells me "...infinity should be a number."  ! ? ! ?

 

Thank you in advance.

Jim Z

Hello,

I have an expression:

y:=a*10^(x/20)+b*10^(x/10);

(x is real here)

I 'd like to write this epxression in the form of y=a*K+b*K^(2) with Maple using 10^(x/20)=K substitution.

I have tried it with subs and algsubs but they don't work here for me.

(Originally I had a more complicated expression of this type).

Thanks for your help in advance.

Hello Maple wizards,

I'm trying to use numapprox[infnorm] to locate the L-infinity norm of functions such g(y) on the range 0.0..1.0 at the bottom of this post. Plotting shows that the function has an range of width 10e-3 that contains a minimum near y=0.9965, but infnorm() doesn't find it unless the range is artifically constrained to be close to the minimum.  I'm using infnorm() in a proc's loop, so manual control of the range based on the graph is not an appealing option.

I am trying to graph a unit circle with a triangle in the second quadrant on one set of axes.  Can anyone help with this?  I'm just learning Maple and am having a hard time with it.  Thanks!

Suppose you have a system of linear ODE's and you want to convert them into one matrix equation. Basically what you do with algebraic eqs using GenerateMatrix. Is there a Maple command to do that? Obviously, one could you use the lagrangian if the eqs happen to represent a dynamic system but that's not what I am looking for. And the second part of the question, once you have the matrices is there a way to export them and ,say, run a finite element analysis with them?

thanks a lot

dimitrios

Hi,

I need to solve iteratively the following equation: Y=A(t) *B(Y) using the values of the following two sets .

A=[0.9,0.75,0.6,0.2,0.08,0.06,0.051,0.05]

I would like to be ale to define a function such as f(x)= exp(a*x) and have it display the gausian curve and animate as the values of x change.  The software keeps treating a as a variable of it's own, I want to treat it as a constant. 

This is a unique, powerful and useful tool that will help students do decompositions of rational functions. See the attached worksheet. Also, you can view an interactive video tutorial that shows you how to use the Partial Fractions Finder: (Ctrl + click on link below) Video Tutorial: Partial Fractions Finder      

I need to plot [cos(v)*x(t), sin(v)*x(t), v] where x(t) is the solution to diff(x(t),t)=sqrt(1/(-x(t)^2+1)-1) I can use DEplot to show me an approximation of x(t), which is what I want, but I need to graph the afformentioned 3d plot. I am not having success with DEPlot3D, because I can't figure out how to plot it with the cosine and sine functions shown above. I would appreciate any help.

      I've searched quite extensively across the internet and cannot seem to find my answer, even on this forum or in maple help.

     I'm trying to plot parametric surfaces using the (u,v) notation or in other words

cos(v)i + sin(v)j + (u)k

so have tried in maple as such:

cylinder := (u,v) -> [cos(v), sin(v), u];