Hi,

I have an inverse kinematics model for a double inverted pendulum. There are multiple solutions for each joint angles due to symmetry and I have to choose the appropriate ones. I thought I can use the previous choices and compare them with the current multiple solutions, so I could choose the ones which are closer to the previous ones. However, since the double inverted pendulum moves in in both region at the equilibrium, this aproach does not work. Could you advise...

I watched a webinar by Dr. Robert J. Lopez, titled "Algebra, Trig, and Precalculus Math – All by Syntax-Free Maple".

In it he says he will give his email at the end if anyone wants the worksheet he is using during the webinar.  

I don't think he ever gave his email and, as a Precalculus teacher, I would really like the worksheet.  Please advise.

Hello all,

I'm trying to evaluate the integral (on Maple 14):

int(lambda/(A+B*lambda)^2,lambda=0..1) assuming A::positive, B::positive;

Maple cannot evaluate the integral, but returns the function call.  However, if I try to evaluate this in Mathematica, which I also have access to, it can evaluate it.  (The result is -(B+(A+B)ln(A/(A+B)))/B^2(A+B), if anyone is interested.)  I was wondering if there's something I'm doing wrong with the...

In a study to determine relationship between presence of I.H.D and smoking, the appropriate
Statistical test is:
(a) z-test (b) Paired‘t’ test (c) Chi-square test (d) None of the above

2. Of the 140 children, 20 lived in owner occupied houses, 70 lived in council houses and 50 lived in
private rented accommodation. Type of accommodation is a categorical variable. Appropriate graphical
presentation will be
(a) Line chart (b) Simple Bar chart (c) Histogram (d) Frequency Polygon

1) whichone of the following is used to representing qualitative data?

a) histogram, b) polygon, c) pie chart, d) line chart

Hello. I tried to plot simple functions in MAPLE 16 and received this message:

Error, (in plot) unknown optional arguments [true]. I am not sure what the problem is and would appreciate any help. I have included an example below. Thanks.

> with(linalg); with(plots);
> plot(cos((1/2)*x)+sin(2*x), x = 0 .. 4*Pi);
Error, (in plot) unknown optional arguments [true]
>

#hi guys i have a new challenge. and i need your help again, my problem is to map a  piecewise function and #evaluate  with a matriz. thus 

A := LinearAlgebra:-RandomMatrix(2, 3);
B := piecewise(a+b < x, a.x+b^2, a+b < x and x < a^2+b, x^2.b+a.x);

A := convert(A, listlist):

#this is my last try to do that.

LL := map(((proc (a, b) ->( a+b < x, (a.x+b^2)/(a+b), a+b < x and x < a^2+b, x^2.b+a)@op), %):

#i...

I have a test server up for MapleTA 8.  Where is the option to show a student's name on the questions?

restart; with(Student[NumericalAnalysis]); with(PDEtools, casesplit, declare); x := .5; a := 1; b := .5; d := 1; Q := 2; omega := .4; h1 := 1+a*cos(x); h2 := -d-b*cos(x+omega); F := Q-1-d; de := diff(alpha*f(y), y, y, y, y)+G*(diff(theta(y), y, y))+B*(diff(phi(y), y, y))+6*beta*(diff(f(y), y, y))*(diff(f(y), y, y, y))^2+3*beta*(diff(f(y), y, y, y, y))*(diff(f(y), y, y))^2 = 0, diff(theta(y), y, y)+Nb*(diff(theta(y), y))*(diff(phi(y), y))+Nt*(diff(theta(y), y))^2 = 0, diff(phi(y...

Hi 

I have a big maple sheet on 1000+ lines writing in 2D math in maple 16 that does som calculations on data sets. The sheet can do calculations on 1 data set at the time so I would like to reuse this sheet i a loop. So far I have not found a solution to get a do loop to work over several lines/inputs in a way similar to:

> for i from 1 to 10 do
>   exp1 
>   exp2 

....
>   exp1000+
> od:

Does anyone know how this can be done? 

Program:

restart;

printlevel:=3:

for a from 3 to 30 do

   for b from 23 to 30 do

       for k from b to 30 do

         for d from 4 to 30 do

            for e from 10 to 30 do

  big:=max(sqrt(a^2+b^2), sqrt(k^2+d^2), b+k,e,d+e-a):

  small:=min(sqrt(a^2+b^2), sqrt(k^2+d^2), b+k,e,d+e-a):

I have a somewhat time-consuming numerical integration which is needed for many different parameters so I'd like to parallelize the various integrations. Threads:-Seq should be just the ticket for this; so I write:

respr128:=[Threads:-Seq(evalf(Int(S(ener,Ecrit)*rangeexp(amp,depth/4,t0[128]),ener=0.001..10*Ecrit,method=_d01ajc,epsilon=1.0e-5)),depth=1..36)];

The functions S and rangeexp are defined thus:

S:=(omega,omega_c)->(9*sqrt(3)/(8*Pi)*omega/omega_c...

restart; b := 20; de1 := diff(f(eta), eta, eta, eta)+f(eta)*(diff(f(eta), eta, eta))+1-(diff(f(eta), eta))^2+k*(f(eta)^2*(diff(f(eta), eta))-2*f(eta)*(diff(f(eta), eta))*(diff(f(eta), eta, eta))) = 0, diff(theta(eta), eta, eta)+Pr*f(eta)*(diff(theta(eta), eta)) = 0, f(0) = 0, (D(f))(0) = 1, theta(0) = 1, (D(f))(b) = 0, theta(b) = 0; d1 := subs(Pr = .5, k = 1, [de1]); d2 := subs(Pr = 1, k = 1, [de1]); d3 := subs(Pr = 1.5, k = 1, [de1]); d4 := subs(Pr = 2, k = 1, [de1]); da1 := dsolve(d1, numeric...

In MapleTA, how can I carry a value that is calculated/entered in one question over to another question?

As far as I know all variables in MapleTA (such as $v) are local variables (defined within the question) and not global variables (shared by multiple questions).