## 3D trapezoidal interpolation, or another suggestio...

Hi All, I'm wondering if anyone can advise me on ways to perform 3D trapezoidal interpolation in Maple. Using 40 experimental data points View 2213_090606_PleaseHelp.mw on MapleNET or Download 2213_090606_PleaseHelp.mw, my goal is to generate a figure like the one on the right here: That figure was generated manually by a colleague of mine (he drew in the triangles himself), but I'm wondering if Maple can do something like this. Thank you very much for your time!

## Size (or length) of a list...

Hi all I'm sorry for the immense stupidity of this question, but I've been reading Maple's help files for about an hour and I can't find the answer to this simple question. Maybe someone can enlighten me! What is the function that returns the length (by which I mean the number of elements) in a list? Thanks in advance Dave 8o)

## scale cluttered...

When I plotted a graph the numbers on the axes were so cluttered that they're not readable. Can I set the scale so that the distance between the numbers is bigger?

## Solving Associative algebras...

Hey... i urgently need help from the experts out there. Could someone tell what's wrong with these equation? Maple only returns solutions may have been lost! Thank you. solve({(-(a*c)*b^(-1)*d111+a^2*b^(-1)*d112-c^2*b^(-1)*d121+a*c*b^(-1)*d122-c^2*b^(-1)*d211+c*a*b^(-1)*d212-c^3*(b*a)^(-1)*d221+c^2*b^(-1)*d222)(b*d211+b*c*a^(-1)*d221-(b*d121+c*b*a^(-1)*d221)),(-(a*c)*b^(-1)*d111+a^2*b^(-1)*d112-c^2*b^(-1)*d121+a*c*b^(-1)*d122-c^2*b^(-1)*d211+c*a*b^(-1)*d212-c^3*(b*a)^(-1)*d221+c^2*b^(-1)*d222)((-c)*d211+a*d212-c^2*a^(-1)*d221+c*d222-((-c)*d121+a*d122-c^2*a^(-1)*d221+c*d222)),((-c)*d211+a*

## Infinite Integral...

Hi; Is there any way to find int(x*exp(-I*x*theta)/sinh(1/2*Pi*x),x=-infinity..infinity); by maple, where theta is a real constant. cheers Sayed

## Modeling...

Hello all, Up-Front: it is a homework problem I've been a longtime Mathcad user but have recently discovered the elegance and easy to use Maple. The problem I am having is setting up the following equation: velocity plus the distance equal to the square of time. With initial conditionsL y(0)= 6. I am able to plot, set up for solving etc.. but this one is killing me. I need to solve for the general solution.. hence this post. Any hints tips etc.. will be appreciated. TIA Larry aka malt_master@comcast.net

## Power Scale...

I want to plot a function, and set the x axis in powers of 10 like: 10, 10^2,10^3,10^4 etc... But maple sets it to 1,2,3... Can anyone help?

## strange plotting...

Dear Maple Primes! I'm trying to evaluate the function F = (2^x/x!)^(1/x) for large x (upto 25,000 say). Maple seems happy to do this using the eval command. However, when I try to plot F it seems to have trouble, and the plot disappears at about x=170 only to reappear at about x=1000! Is this problem related to the plot command, or to the evaluation of F? Is maple's evaluation of F for large x reliable? Thanks for the help Ben

## Sorting solve's set of variables with values....

I am solving a set of equations with 4 variables. The solve comes out as an unordered set each time and I cannot figure out how to sort them. Btw, I am using Maple V Release 4 (yes it is old. :-))

So here is the results of the solve

sols := {b1 = 84.92147612, b4 = 87.31363038, b2 = 101.6273403, b3 = 86.10094107}

What i need to get is either the solution ordered {b1,b2,b3,b4} or the indices of the variables in order. I have tried the following:

Isort:=proc(L) local a,i;
> a:=sort([\$1..nops(L)],evalb((i,j)->L[i]<=L[j])); [seq(L[i],i=a)],a end:

as recommended from another post and i get the following error:

## Help...

Hello there im trying to find the value for x(solve) in an equation, how do i do that in maple?? For example...2x-a/x+a - x+3a/a-x = a^2/a^2-x^2 + 3 Thanks

## Data Format for Use In Data Analysis Assistant...

I am having some trouble figuring out exactly how to organize data points to be used with the Data Analysis Assistant in Worksheet Mode. I initially extracted the expression sequence of data points from the data structure generated by the plot command (an ordinary 2D plot of a function); I then put the expression sequence in a list and put that in a Vector, and was successfully able to look at the data with the Assistant. I'd like to use my own data points (i.e., from Physics labs, etc.), but I don't know what type of data structure to use. The Assistant tells me to put them in either a Vector or an Array, and I've tried both; I get an error indicating that the order (or dimension) of the Curves structure cannot be found (or something to that effect).

## Integral over a line on the upper half-plane...

Hi, Is there any method to find an integral over a line on the upper-plane of x, from –infinity+I*0 to +infinity+I*0 by the form Int(exp(-I*(x-1/x)*theta) /sinh(x-1/x),x=–infinity+I*0.. +infinity+I*0) Or more complicated Int((x^2+x+1)/sinh(x-1/x)*exp(-I*(x-1/x)*theta),x=–infinity+I*0.. +infinity+I*0) Where theta is a constant real number. Cheers Sayed

## Is it possible to do Div operation on a tensor_typ...

I know using partial_diff can do Grad of a rank 1 tensor (i.e. vector) and get a rank 2 tensor. How do I do the reverse? is there any simple way? Thanks

## mathml in jsp...

I would like some help on how to include mathml formulas from Maple in jsp pages for Maplenet. I use de MathML:-ExportPresentation to obtain the mathml form from Maple, but I cannot see it correctly in a jsp page. It seems mathml works fine when I have a html page. I would like to know if is there anything else I should do so that i can work in jsp too. Thanks

## sketch questions in Maple TA...

I have learned in Brownstone site how to create,
using latex, sketch questions for Maple TA.
I could create a question bank, formed by sketch mode questions,
and then uploaded it to Maple TA, but the applets just don't work.
There are no java error messages.
On the java console i get messages like:
--------------------------------------------
false
false

SplinePlot.mousePressed():
Could not add node because of conflicting x-coordinate:
node with matching x-value already present in system