## Diagnosing '"No Solutions"...

I am solving a constrained maximization problem using the Lagrangian and getting back an empty set of solutions, i.e.: solns_LSW:= How do I go about diagnosing why Maple is having difficulty finding solutions? (Once I know that, I would of course also like to know how, if possible, to change the set-up so that Maple might actually find the solution(s)!) I can see that the Lagrangian becomes non-concave for cases where lambda2>p (p is one of the variables I am solving for: there are two, s and p -- see attached worksheet). This would clearly be the case for, say, p=0 optimal (which I have reason to believe it is, based on some numerical simulations I ran).

## Simple question regarding "solve" command...

Dear all, In the attached file I try to solve expression Y for p. As Y includes dCS(p)/dp, the solve command produces an error message. I do understand that Y can't be solved for p since expression dCS(p)/dp is not fully defined. However, the result I am aiming for is simply: p = -(1/2)*(dCS(p)/dp) (with p simply being a funtion of dCS(p)/dp) Which command leads to this result? I haven't found it in the help section. Many thanks for your help! Florian View 5919_Question_solve

## Wireframe Grid resolution for 3D Plots...

Hello everyone, I was wondering if the grid resolution for "patchedcontour" wireframe 3d plots is adjustable? The only setting I know of is 'numpoints', and I can set that to a high number to get a better looking 3d plot, but this results in a dense amount of wiring for the plot. So I was curious if there is a way of getting the 'better' look for a graph while keeping the number of wires low enough so that contours are easily visible (and usable). Any takers? Thanks in advance. :o)

## Improve my code for parabolic equations...

I have been told my code is not 'perfect', I'm not too hot on maple and it has taken me a week to get to this stage. Any help or suggestions would be very welcome! h:=0.1: k:=0.001: r:=k/h^2: xl:=0: xr:=1: # left and right ends of interval in x nxpoints:=round((xr-xl)/h): ntsteps:=5: # total number of time steps iprint:=1: # print output every iprint time steps printf(cat(" x,t ","%7.3f"\$(nxpoints+1),"\n"),seq(i*h,i=0..nxpoints)): format:=cat("%7.3f"\$(nxpoints+2),"\n"): # format for printing output Boundary conditions for j to ntsteps+1 do u[0,j]:=0: u[nxpoints,j]:=0

## Summation peculiarity ... and partial fraction exp...

hello all ... peculiar problem here ... please help the expression is true that 1/n(n+1) = 1/n-1/(n+1) since 1 = n + 1 - n gives 1/n = (n+1)/n - 1 Is there a way to demonstrate this identity in Maple ? ? I cant find any trick with "expand" or such that works. This impact is also seen when evaluating ... the following ... sum(1/n-1/(n+1), n = 1 .. infinity) = 1; = print(`output redirected...`); i get the proper answer of 1 but no answer with :::

## How to compute the min and max value of a list wit...

I know maple has two functions max and min to compute the maximum and minimum of some arguments. But I have a list,such as l:=[1,2,3]; when I use the maple function min，I need to write: min(l[1],l[2],l[3]); How can I simplify the expression? If l is list with too many items,how to use min to calculate the minimum?

## generate a list of numbers then gather them into a...

I need to make a list of 12 random integers from 0 to 1. Take the sum of those values and subtract 6. I have that part....now the part I don't have is how do I run that 10^6 times and keep track of my values? with(RandomTools): with(stats): with(ListTools); > L := seq(Generate(integer(range = 0 .. 1)), i = 1 .. 12); 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0 > > G := add(i^2, i = L); 9 > Z = G-6; Z = 3 That is my program so far. Any help is appreciated.

## Graphical User Input...

Does anyone know if there is a way to obtain the coordinates of an ordered pair on a graph? I see that Maple states the ordered pair your cursor is currently situated at, but what I want is to 'grab' these coordinates and use them in other calculations. Essentially what I want is a Maple command similar to ginput on Matlab. Thanks.

## JavaViewLib with Maple 11

by: Maple
Hi, is the JavaViewLib package 3.22 running with Maple 11? After: ``` libname := "/home_zam/plch/maple/JavaViewLib", libname: with(JavaViewLib): ``` (this works fine in Maple 10) I received: `Warning, system/ssystem calls have been disabled in the options dialog.` Any suggestions? With best regards. Roman

## Missing Operator...

> plot([(12-2x)^(0.5)], x=-10..10); Error, missing operator or `;` this line looks right to me but i keep getting that error in maple. i have also tried: > plot((12-2x)^(0.5), x=-10..10); does anyone have any ideas how i can fix this? any help would be great thanks

## PARAMETRIC EQUATIONS...

On Maple 11 Modern Version: If I have two parametric curves, say y = 4t + t^4 and x = 5t - 7t^2 how can I plot an equation such as (y'') * (x') + (3x'') with ' being differential and '' being second differential. I have tried it in numerous ways but get the following error message - "Warning, unable to evaluate the functions to numeric values in the region; see the plotting command's help page to ensure the calling sequence is correct". I have been trying to plot for t=-1..1. Thanks

## Solve This! - Elliptic Integrals...

Several weeks ago I submitted a request titled "Plot This! - Elliptic Integrals", which Dr. Robert Israel responded to with the following code which successfully plots the relationship of two variables, beta and k, over the range of interest. > with(plots); Digits := 15; > implicitplot(2*EllipticE(sin(beta), k)-EllipticF(sin(beta), k) = tan(beta)*sqrt(1-k^2*sin(beta)^2), k = 0 .. .99, beta = 3.5 .. 5.5, view = [0 .. 1, 3.5 .. 5.5]); However, the plot indicates that for the range of k=0..0.99, beta is approximately equal to 4.77 radians (273 degrees), whereas the paper that I am researching indicates a value of beta equal to 257 degrees 28 minutes. I have attached worksheet that includes the commands provided by Dr. Israel for information.