I suffer from floaters, (objects that appear in ones vision), a condition that is worsened by looking at white surfaces.  Is there a way of changing the background colour of a maple worksheet from white to a darker shade, perhaps a light grey or something?

Hi,

I have this equation:

Hello,

I like to plot the Bode diagram of function transfer. For that purpose, i use Dynamicsystem package.

I obtain my transfer function by 2 different methods : 
- direct method
- state space method.

The issue is the fact that i don't obtain the same results with the 2 methods.

 state_space_metho.pdf

I want construst a vector with 2^62 entries. Only 2^20+1=2049 entries are non-null complex numbers and others are all zero. Maple tells me the memory is not enough.

Recently I was able to try Maple 17 beside Maple 12.  There were little wiggles in 17's plot but not so in 12's.  I thought what if I dragged 12's plot into 17's?  What would I get?  Well here is the result.

I made a plot of x^2+10 in Maple 17 and a plot of x^2 in Maple 12 then dragged the line over. And this is the visual I got

A reddit user posted an interesting question:

http://www.reddit.com/r/math/comments/1eyx0f/help_with_simplifying_in_maple/

The problem is how to simplify, e.g. 2/3*37^(1/2)*sin(1/6*Pi+1/3*arccos(55/1369*37^(1/2)))+2/3 to 4.  I tried a few things and got nowhere.  Any suggestions?

#### Code attached at the BOTTOM ####

If I run these seperately, they seem to be running fine as shown above. But when I run '8' after '7', it does not seem to be working as in first picture.

I am trying to solve a problem using fsolve. Where the fsolve is inside the integral. I keep getting the following message. Here is what I am trying to do 

int(fsolve(int(k*r*PDF(R,r),r=-infinity..x)=0,x)*PDF(Q,z),z=-1..1);

where Q is a normal distribution and R is also normally distributed with its parameter conditional on Q. Following is the error message that I get.

"Error, (in fsolve) z is in the equation, and is not solved for"

Question (A)

The surface z=f(x,y)=5/(1+x^2+y^2) is a hill. A bug walks along the path with x(t)=2+3cos(t) and y(t)=-1+2sin(t)

and z(t) is on the surface (0≤t≤2pi).

Plot the surface z for -4≤x≤7, -4≤y≤4 and includethe path (in thick black) of the bug on the surface.

(this will require 2 graphing commands plus a display 3d. Think spacecurve for the bug's path.)

Animate a solid...

Please, explain me, why I got this? And how to get normal one?

restart;

with(ExcelTools):

with(ListTools):

with(DynamicSystems):

filename := "MSFT";

close3 := Import(cat(cat("C://US//",filename),".xls"), filename, "E2:E100");

this i usually use ln(close3[n]/close[n-1]) as the original series

as i do not know whether Sample in statistics package can use this directly,

or 

need to use counting to classify them into some group and got a distribution graph

genDE := Diff(g(t),t)^2 - 1 - x*(g(t))^2 - (y-x^2)/12*(g(t))^4 = 0;gensol := dsolve(genDE,g(t));genfun := rhs(gensol[1]);

from above, i got generating function and then continue to derive got the following error

u = ln(-sqrt((-z^2+y)*(-3*z+sqrt(12*z^2-3*y)))*z^2/(sqrt(-z^3*(-3+2*sqrt(3)*csgn(z)))*(-z^2+y)))/x;

tau := subs(u=z,solve(q,z));

it said solution may have lost

if this can not be direct to...

restart;with(Statistics):

MartinPoisson := (p/((p+2*q*T)/(1+p*T+q*T^2)-(p*T+q*T^2)*(p+2*q*T)/(1+p*T+q*T^2)^2))^r*r^2*T^n/factorial(n);

Dist := subs(T=t,MartinPoisson) assuming t > 0;

MartinDist := Distribution(CDF = unapply(piecewise(t>1,Dist,0),t));

MartinDist := Distribution(CDF = unapply(Dist, t)) assuming t > 0; #Change 2

X:=RandomVariable(MartinDist);

MartinDensity := PDF(X,t);

MartinDensity := subs(t=x, MartinDensity);

SURF is the surface z=2x^2+y^2 for x=0 .. 2, y=0 ..4 and view= -1 ..16.

L is a straight line laser beam x=7-2t, y=t, z=4t-1 which hits SURF at the point P=(1, 3, 11).

Graph SURF, the laser path in red (t=0 to 3), the normal vector at P in black, and the reflected path in green.

Include the equations of the normal vector and the reflected path.

The surface z=f(x,y)=5/(1+x^2+y^2) is a hill. A bug walks along the path with x(t)=2+3cos(t) and y(t)=-1+2sin(t)

and z(t) is on the surface (0≤t≤2pi).

Plot the surface z for -4≤x≤7, -4≤y≤4 and includethe path (in thick black) of the bug on the surface.

(this will require 2 graphing commands plus a display 3d. Think spacecurve for the bug's path.)