pirolafire

Hello

I am trying to plot a 3d function, but there is a problem.

Here is a screenshot of the problem img130.imageshack.us/img130/6008/3dplotproblem.jpg

thank you

Hello,

I would like to graph a piecewise parametric function:

1 < t < 2
x(t) =1.146967180*(t-1)^3-2.178399723*(2-t)^3+38.3612214*t+106.1461765
y(t)=.3047483217*(t-1)^3-.5750322227*(2-t)^3+10.1163822*t+444.0230985

2 < t < 3
x(t)=-.4672626810*(t-2)^3+1.146967180*(3-t)^3+45.2430246*t+92.3825701
y(t)=-.1402738345*(t-2)^3+.3047483217*(3-t)^3+11.9448719*t+440.3661194

.. and so on and so forth

I have searched and tried playing with the plot command but to no avail.

I have a 3x3 matrix called test, I am trying to compute the sum of all the elements of the first line.

sum(test[1,j],j=1..3)

Error, bad index into Matrix
 

how to do?

thank you

I have written a procedure.  Without going into details, here is the pseudocode of the procedure:

time:=proc(begin,end,c,deltaT)

t:=0;
v:=0;
accel:=5
where-we-at:=a;

while where-we-at =/= end do

distance:=*distanceformula*;
where-we-at:=*where-we-at* formula;
t:=t+deltaT;
v:=someformula;
accel:=accelformula;

end do;
return(t);
end proc:

Hello, I have about 80 equations for x and 80 equations for y. They are called S_{x_0} .. S_{x_80} for x and S_{y_0} .. S_{y_80}. They all depend on parameter m.

I want to define a new piecewise function P such as,

P evaluated at m=i  is equal to [  S_{x_floor(i)} evaluated at i , S_{y_floor(i)} evaluated at i ]

For example,

Hello,

I have defined an expression f. This expression f, when integrated from 18 to b, is equal to 20. My goal is to find this b value. Since the integral is very hard to solve symbolically. This is what I did:

with(Student[Calculus1]);
ApproximateInt(f, t = 18 .. b, method = simpson);

by trying some random numbers v, I have found the approximate value of b.

Hello,

I have about 30 equations, let's call them S_i

I want to plot them. Each S_i is defined for some x between x_i and x_i+1

In other words, i want to plot:

S₀  for x₀ < x < x₁

S₁  for x₁ < x < x₂

S₂  for x₂ < x < x₃

S₃  for x₃ < x < x₄

... all the way to i=29

Hello

I have a matrix, let's call it A. I want to define a new matrix by taking every n-th row in the A matrix. How do i do that?

For example,

A= | 2 3 5 |
     | 9 2 1 |
     | 5 1 2 |
     | 1 8 9 |

the B, if n=2, is equal to

| 2 3 5 |
| 5 1 2 |

Hello, I have an equation with 200 variables and I want to assign them to a 1 column by 200 rows matrix. My variables are named ΔX_i where i goes from 0 to 100. My Matrix is named Matrix.

I have tried something like that:

ΔX_i := Matrix(i) but I get "Error, unsupported type of index, i"

Any ideas?

Thank you
 

Hello everyone

I have a cost function I would like to minimize. It is a fairly simple function that only contains multiplications and additions.

Only problem is, this function has about a hundred variables, but they can only be between the interval [0,1] so I guess it makes the problem easier.

Is it possible to write a little program in maple that can be ran as much as I want it to run and that could try to find an approximation of the actual solution? (By trying random numbers between 0 and 1)

Thank you very much

Hello,

I have a question about matrices in Maple.

I have defined the matrices s, x, y and z which are all 5x1 matrices. I have also defined a constant c

Now I want to define a 5x1 matrix, in which each element will be defined by a function: