## Use of Heaviside Function...

I'm having difficulties in using the Heaviside function in Maple. My heaviside function is (t-tau), and I'm having trouble integrating tau from zero to t. After integration, the expression still shows an integral. Is it because when tau = t, the heaviside becomes zero? Any and all help is appreciated. Attached is the actual sheet. The 2nd to last and last steps are the steps or concern.... **** This problem has been overcome *****

## Dumb Question from Maple Noob about Lists/Array cr...

How do use an equation to create a list/array?

e.g y=x*5+1

for x from 0 to 1 in increments of 0.1

answer should look similar to:
[0,1]
[0.1,1.5]
[0.2,2]
[0.3,2.5]

## diff eq.......

Dear Maple user(s), I have the next problem, hopefully you can help me: I have two Diff. Eqea. 1) diff(w,x,x) = -a*diff(w,y,y) 2) diff(w,x,x,x) = (a-2)*diff(w,x,y,y) a=constant Now, I need to know: w=f(x,y) How do I solve this in Maple, do I maybe need more conditions to solve this? Regard, Michel

## Bootstrap...

Has anyone been able to use the statopts option in the Bootstrap command which is in the Statistics package in Maple 10? Note the following sequence of commands > with(Statistics) > Bootstrap('Mean', [1, 2, 3, 4, 5], replications = 6, output = array) print(Matrix(1, 6, {(1, 1) = 2., (1, 2) = 3.39999999999999990, (1, 3) = 2.20000000000000016, (1, 4) = 2.79999999999999982, (1, 5) = 3.60000000000000008, (1, 6) = 2.20000000000000016})); [2., 3.39999999999999990, 2.20000000000000016, 2.79999999999999982, 3.60000000000000008, 2.20000000000000016] According to the documentation which is attached as a PDF file it appears that this command should work.

## Table lookup...

Does any body know if there is a function like interp1 available in Maple or at least what is the easiest way of establishing a look-up function in Maple. I have a n*2 matrix of data (x, and f(x) in each column) and I would want to interpolate data from this matrix. This is actually one of the applications of interp1 function in MATLAB...

## Apollonius (Geometry)...

I'm trying to get the Apollonius geometry function to work with a set of circles, and it's giving me some trouble. I suspect I'm doing something wrong, but I don't know what. I'm using Maple 10.02 on Windows XP. When I do the following, everything works great: with(geometry): circle(test1,[point(t1p,0,0),1]): circle(test2,[point(t2p,2,0),1]): circle(test3,[point(t3p,0,3),1]): tapp := Apollonius(test1,test2,test3); tapp := [Ap1_of_test1_test2_test3, Ap2_of_test1_test2_test3, Ap3_of_test1_test2_test3, Ap4_of_test1_test2_test3] However, when I change the test3 circle to be tangent to test1, I get this error:

## Possibility to call java programs from Maple TA...

Hello, currently I am trying to find out about the java(CN,a,b,c,d,...) function named in the Maple TA help. I just knocked together a small class which implements the named public function `public String eval(String[ ] args);` I tried to figure out the right place for my class. So I created a *.jar file containing it. I put it inside the "java" directory contained in the Maple TA install dir. But this does not work. :-( Right now I am wondering where to put this class and/or jar-file?! Has anybody used this function and is able to help me out? I would be really thankful for a hint because that function promises to be very useful...

## Surface fit with boundary conditions...

Hello dear Maple users! I have the following problem that I am trying to solve with maple. I have a set of data points (i made these up for now, the real set has more points) x:=( 1,2,3,4,5,6,7,8 ) y:=( 1,2,3,4,5,6,7,8 ) z:=( 3,1,3,2,4,7,7,9 ) Now, I know how to surface fit this and get maple to formulate an equation for z=f(x,y) with the following statement: w:=(Statistics:-Fit(a + b*x + c*y + d*x^2 + e*x*y+f*y^2,

## Using plots(inequal)...

Hi Maple's experts, I would like to draw inequalities in R^3. Is there a similar command (to "inequal") for more than two unknown variables?. Thanks in advance, JJ

## genvecs in maple...

Hi. There is a command called genvecs in mathcad and i wonder if there is something similar in maple. Or can somebody tell me how to make the same in maple. Regards M

## Sheet for percolation...

has someone a sheet about percolation theory ? I put a very simple one on my blog: percolation

## First order difference equation !...

Can maple do this ? and how .... I know you can do the graph, but I need to know if maple can do my problem. ex: Y(t+1) + Y(t) = (-1)^t and y(0) = 2

## problem with max.....

Hello, How to select the maxima of the list H1:= [[8,9,11],[8,10,11],[5,10,6]]? I do mean, I would need to select the maxima among the first components (8,8,5), second components (9,10,10) and third components (11,11,6). I would also need the index of this elements that are in the maxima set. Leika

## How to draw it?...

I want to draw the set of points that satisfies the following sets of inequalities: x+y>=50; #(1) x+z>=50; # (2) y+z>=50; # (3) subject to x+y+z=100; I tried: >with(plots): >implicitplot3d( {x+y+z=100, x+y>=50,x+z>=50,y+z>=50}, x=0..120, >y=0..110, z=0..115, axes=normal); 1. How could I do to see exactly the required set in a different colour? It would be possible to give different colours to each constraint (1-> yellow, 2->blue, 3 ->red)? 2. It would be possible to avoid the three dimension space and to represent everything on the plane x+y+z=100 (that is, to represent the inequalities 1, 2 and 3 only on this plane)?.

## assuming and procedure parameters...

Hello,

I am looking for an explanation for the following behavior :

> f := proc(x) somefunc(x) end proc:
> a := table([variable=z]):
> f(a);
somefunc(a)
> f(a) assuming z::real;
somefunc(table([variable=z]))

Why is 'a' replaced with its corresponding table in the second case? And is it possible to use the name 'a' in the return value?

-- Thanks for any reply,

Franky.
﻿