I decided to convert an old LR question to Maple 15 syntax and update my Maple T.A. questions. I have it working in Maple, but in MTA I get an error: "java.io.IOException: Maple computation error", I've eliminated lines until I found out the error is when I use Fit to solve for the equation. What am I doing wrong?

Thanks, Stephen

I define 8 x values, and calculate 8 y values with random residuals. Then I solve using least squares.

$x1=180;

what should i do to get display buttons in maplet as an input in TextField? so that everytime i click on a button in maplet, the value of that button will show up in TextField as an input, such as if i click on a  Button("1") , the number 1 will show up in the TextField. thanks in advance.

Hi, I have two matrix

a:=Matrix([[4,3,4],[7,7,3],[7,3,1]]):

b:=Matrix([[6,3,5],[9,8,0],[8,8,1])):

How do i make it into a [9x9] matrix? I is a diagonal matrix in the sequence of a,b,b,a. The first end of first "a" is added with begining of "b", the end of second "b" is added with the begining of third "b", and the end of third "b" is added with the beginning of final "a".

The answer that i'm getting shall be as follow :

c:=Matrix([[4,3,4,0,0,0,0,0,0...

Hi,

Well, I'm trying to connect a translational spring to a revolute joint. But, I'm unable to do so. I'm new to MapleSim and I ain't a mechanical engineer either. I need you to help me a little. Anticipating a quick response!

I wrote my own maple library. Some of its procedures require the LinearAlgebra-library.

Is there a way to automatically load LinearAlgebra when loading my library? (I tried to use 'use' but it didnt help )
Currently i load my library with

read "/home/..../something.lib";

Is there any good refernce to learn how to write maple libraries the right way? the maple help isnt actually very helpful.

restart;with(geom3d):

point(M,1,2,1):

plane(P,x+y-3=0,[x,y,z]):

plane(Q,2*x-2*y+z-1=0,[x,y,z]):

line(d,[1+2*t,1-t,t],t):

n:=NormalVector(P):

line(Delta,[M,n],t):

Eq:=Equation(Delta):

intersection(N,d,P):

coordinates(N):

decom:=proc(n::posint,m::posint)
> local a,c,d::posint,e,f,i,j,k,l,s,t,u;s:=[];t:={};u:={};
> if m=n then return [[1$m]];fi;
>  for i from 1 to nops(decom(n-1,m)) do
>   a[i]:=op(i,decom(n-1,m));# a is a list
>   c[i]:=[op({op(a[i])})];
>   #d[i,j]:=coun(a[i],op(j,c[i]));#c:unrepeated numbers in a. d:number of repeatance
>    for k from 1 to nops(c[i]) do
>     e[i,k]:=aadd1(c[i],k);

decom:=proc(n::posint,m::posint)
> local a,c,d::posint,e,f,i,j,k,l,s,t,u;s:=[];t:={};u:={};
> if m=n then return [[1$m]];fi;
>  for i from 1 to nops(decom(n-1,m)) do
>   a[i]:=op(i,decom(n-1,m));# a is a list
>   c[i]:=[op({op(a[i])})];
>   #d[i,j]:=coun(a[i],op(j,c[i]));#c:unrepeated numbers in a. d:number of repeatance
>    for k from 1 to nops(c[i]) do
>     e[i,k]:=aadd1(c[i],k);

For example, in the list [1,1,1,1,2,4,6,1,9], how many 1s are there?

Is there a procedure in Maple? Or how can I manage to do it?

See the attached worksheet: myDet.mw

Why does the determinant of A  contain  x, x^3, x^5, x^7 and x^9 ?

Maple15/Linux/Fedora16_x86_64

i am solving for a system of df eq's, but the eq's have these little tricky integrals inside them.....so it either retards operation or no solutoin can be found...They look like...

B_12:=(10*a_2*a_3)*(u/( ((10^2+u)^(3/2)) * ((a_2^2+u)^(3/2)) * ((a_3^2+u)) )):

B_122:=(10*a_2*a_3)*(u/( ((10^2+u)^(3/2)) * ((a_2^2+u)^(5/2)) * ((a_3^2+u)) )):

B_123:=(10*a_2*a_3)*(u/( ((10^2+u)^(3/2)) * ((a_2^2+u)^(3/2)) * ((a_3^2+u)^(3/2)) )):

B_23:=(10*a_2*a_3...

My problem looks as follows................pts1FIXED comes from dsolved solution......it plots a empty figure...and i checked that l(the data pairs looks fine)..

--------------------------------------

Energy:=array(1..450);

Time:=array(1..450);

for i from 1 to 450 do 

	

	Energy[i]:=-1*((32*G*Inertia^2*e^2)/(5*c^2))*pts1FIXED(i);

end do:

l := [[t,Energy[t]] $t=1..450]:

plot(l,style=point,symbol=circle,color=blue);

I need some help...i need a solver using the Runge-Kutta method adaptive size control, to solve a sytem of 5 diff eq's, all of them are interlinked...

And 

Say that dsolve numeric produces a results, called Solution, Now ex  solution(0)=1, and in general solution(t) can be evaluated, now, i want to use this, in E(t)=2*solution(t), in a plot, thus...

plot(E(t),t=0..100,....), but returns the error....

hello everyone, this is my first time visit mapleprimes, i just started to use maplets programming, so there are a lot of things i still don't know about this maplet, if i ask some stupid questions please be patient with me.

so i've been trying to write a maplet that will calculate some simple functions such as addition, multiplication, division,...,it's kind of like a calculator. 

i've been trying all day, and no luck so far. help please. 

Ok, I am not a very experienced user, but I am mystified by this.  The essence of the problem is that when entering a range of values in an integration, I get a different answer if the range is given as 0..1 to if it is given as 0.0..1 or 0..1.0. Here is the program

### dgig
dgig := proc(psi, chi, lambda, t)
    (psi/chi)^(lambda/2)*t^(lambda - 1)*exp(-(psi*t+chi/t)/2)/\
    (2*BesselK(lambda,sqrt(chi*psi))):
end: ## End of dgig