how can I simulate the motion of the domain walls motion , using maple soft?

Is there a programme , or a special equation the does that?

Who knows how to model a brushless dc motor?  Can I use a synchronous machine and some circuits? Brushless dc motors do require rotor position information in order to select the appropriate commutation angle. Using three Hall sensors? But how to model a hall sensor or something which can specify the rotor's position and send out a signal? I am looking forward to your answer. If you have some experiences of modeling a double closed-loop dc machine using maplesim, please tell me too.

when I do the integration

>int(exp(-I*x*p),x=-infinity..infinity)

the result  obtained is  "undefined  "

but, actually it equals  Dirac(p). How can I get this result?  I badly need this.

well,it's the Fourier transformation of the constant function 1, but I don't want to use the internal function fourier();

Thank you!

Hello! Excuse me for my English!

I am student. How can I evaluate the integral numerically?

Maple can't compute:

evalf(Int(sin(x^19),x=0..10))

I think, that the problem is in the oscillating function.

Maybe, I have to change some options?

Hello!

Suddenly when starting Maple 13 on my PC (Windows 7 x64, 4GB Ram, Phenom 965 with 4x 3,4GHZ, HD5770) I noticed that it really takes ages to execute the entire worksheet (3 exclamation marks). I opened the Task Manager and became aware of the problem: Maple 13 obviously does NOT use any CPU ressources. The "maple.exe *32" uses ~1-4% of one CPU core and only 45.000KB of RAM. Its not really changing...

restart:
with(student):
with(linalg):
# system of linear equations
A := array(evalf([[2, -1, sqrt(2)], [3, 2, -3], [3, sqrt(2), -15/7]])):
B := array(evalf([5 + 7*sqrt(2), -24, -12 - 3*sqrt(2)])):
B := `<,>`(B):
print(A):
print(B):
N := 3:
t := 1*10^(-6):

for j from 1 to N do
for k from j to N do
S := 0:
for i from 1 to N do
S := S + A[i,j]*A[i,k]:
end do: # end of i
C[k] := S:
end do: # end of k
C := 0:

Hi friends,

I have plotted a 3d function by plot3d (z=f(x,y)) , but at the same time I need to know the values of z and also the relevant x's and y's. In fact, when I extract z's from it via "op" function, I don't know to which (x,y) it relates. The only thing I get is the range of x,y, for example 1..5.

Thanx!

Hello all

I am new to maple. I am calculating a mutual information for a continuous distribution over a set of five elements. To approximate the continuous distribution I loop over percentage of integers from 0.01 to 0.99 in steps of .01 For five number this is like 10^10 iterations. Given two restrictions p_1+...+p_5 = 1 and p_1 <= ... <= p_5 this is reduced to something less than 10^7 iterations for the innermost loop. Still this process is very slow. (Well...

Hi, everyone,

I am dealing with a simplified model of my real problem. Here is the function definition

f:=(x,lambda)->min(x lambda,0)

I can plot this function in plot3d:

plot3d(f(x,lambda),x=-2..2,lambda=-2..2, axes=boxed)

but if I try to plot the derivitive of this function w.r.t. lambda (which is a discontinuous function) by:

plot3d(diff(f(x,lambda),lambda),x=-2..2,lambda=-2..2, axes=boxed)

I get error message: Error, (in PiecewiseTools:-Convert...

Sorry, but I am novice at all. I could make the pkt list. But how can I plot the Function with the optimized parameters and the pkt-list into one diagram? Thanks a lot. Walter

Given Datas:

xd := Vector([0, 25, 50, 75, 100, 125, 150, 175, 200, 225, 250, 500, 750, 1000, 1250, 1500, 1750, 2000, 2500, 3600])

yd1 := Vector([0, 6.24, 11.26, 14.9, 17.58, 20.01, 22.0, 23.56, 24.85, 26.03, 27.36, 35.07, 39.4, 42.61, 44.36, 45.79, 46.62, 46.9, 47.79, 48.85])

Given function: (looks a little different in Maple, but copy and paste did not work)

<maple>F2 := proc (x) options operator, arrow; K2*(1-(T12-Tv2)*exp(-x/T12)/(T12-T22...

Maple seems to constrain pie charts to having only a name, or only a percentage or frequency. I want it all.  I don't want to choose between labels and numbers.

A pie chart like this one would be a good start: http://www.mmsonline.com/cdn/cms/Sandvik-pie-chart.jpg except I want to present frequency as well.

Notice in the example above that the large...

Hi all,

I need a contour plot of c with a and b values as x and y axis.

a := `<,>`(Vector(12, {(1) = .19375, (2) = .19494, (3) = .19581, (4) = .19632, (5) = .19646, (6) = .19624, (7) = .19565, (8) = .19472, (9) = .19349, (10) = .19198, (11) = .19024, (12) = .18833}))

b := `<,>`(Vector(12, {(1) = -0.1517e-1, (2) = -0.1515e-1, (3) = -0.1512e-1, (4) = -0.1509e-1, (5) = -0.1506e-1, (6) = -0.1503e-1, (7) = -0.15e-1, (8...

Below is a small tidbit of code that operates on the matrix vel and updates its values.  When I check the values of the indices in the matrix, every single element, barring vel(1,1), vel(1,2), and vel(1,3), is equal to 0.

vel := Matrix(3, 241, datatype = float[8]);

step := 0.1;

vel(1, 1) := 5; vel(2, 1) := 95; vel(3, 1) := 3;

UpdateAllVelocities := proc (i, vel::Matrix, accel::Matrix, step);

#I understand these calls are quite pointless......