F:= <<-3u|u|u|u>, <u|-3u|u|u>, <u|u|-3u|u>,<u|u|u|-3u>>;

I am trying to create a simple loglogplot, but i am getting an empty plot error. Here is my code:

 

with(plots);

 

c:=2.998*10^8;

I'd like to know how to insert the following differential equation in maple 12 (or older doesn't matter that much) without incuring a - Error, recursive assignment -

Plaese note that, in the orignial text, a dott is added over the variable x1:

 x1(dot) := -2*a*x1*(x1-1)+(1-b)*x0

and that this differential equation describes change in the number of entities (x) that move through state 1, there a couple of more equations but i can't figure out how to insert the above one in maple correctly.

 

please help me here. I want to simplify the expression:

 

(-f(xn)^2*f(zn)+f(xn)^2*(D(f))(zn)*zn+f(xn)*f(zn)^2-2*f(xn)*f(zn)*(D(f))(zn)*zn+(D(f))(zn)*xn*f(zn)^2)/((D(f))(zn)*(f(zn)^2+f(xn)^2-2*f(xn)*f(zn)))

 

I just compied it directly from maple

Hi, I'm running into difficulty regarding plotting an array I have.  I have an array of 500 elements and each element corresponds to an even integer.  Hence I want to plot for x=1..1000 where array[1] is plotted at x=2, array[2] is plotted at x=4 etc, and the odd numbers are left empty.  How do I do this.  I tried

fn := proc(n)
  global array:
  if n mod 2 = 0 then return array[n/2]:
  end if:
end proc:

I got a big problem with one kind of integral function. Now, I am using Maple 8 or Maple 11 to get some results from my research topic. However, when I took three times integral like :

f:= Int(exp(-t^2),t = 0 .. infinity)+Int(Int(2*Int(.1*exp(-.25*(u-s-k)^2)*exp(-(-.5*u-.5*s-.5*k+t)^2)*exp(.25*(u-s-k)^2)*exp(-.1*k),k = 0 .. u-s)*exp(-u^2)*u,u = s .. t),t = 0 .. infinity);

After that, I try to draw the grahp of the above equation.

plot(f,s=0..1);

Hi

I am trying to learn the logically equivalent command in Maple.

[(p->q)^(q->r)]->(p->r)

I wish I could post my maple file.

Any suggestions are going to be highly appreciated.

Thanks
 

I have found the distance between two points and considered the endpoints of the diameter of a circle I found the center points.  Now I need to graph.  How?

F := matrix(2, 2, [0, 1, 0, 0]) C := matrix(2, 1, [0, c]) G := matrix(1, 2, [1, 0]) D := m The matrix Riccati equation: dS/dt=FS+SF^T-SG^T(DD^T)^(-1)GS+CC^T where ^T denotes transpose, ^(-1) denotes inverse. Given S(0), what is S(t), a 2*2 matrix, in either analytic or numeric solution? To simply a little bit, let's assume m=c=1, S(0)=0. Many thanks.

I run Maple 12 Student Edition and I cannot find the  "advanced query builder" to import a database file even though it is supposed

to be included in Maple 12?  I have also looked at the "The Maple Database Integration Toolbox"   but it seams that it only

supports Maple 9.5 and not 12 ? plus it appears to be rather expensive?!  I am also reading that Maple 12 will:

 

I am wondering if there is a way to get rid of the extra space around the gridlines, especially in "axes=boxed" mode.

For example, if y=0 is my lowest tickmark, the plot box extends slightly below the y=0 gridline. I would like the plot box to fall exactly on the y=0 gridline (like Matlab would do it).

Anyone know a solution to this?

Thanks.

I am trying to set up a linear optimization problem where I have to set quite a few (and I mean perhaps dozens) variables to zero.  How do I do that without explicitly typing each and every variable and setting each one of them to zero manually?  I am using the Optimization package on Maple 12 (student edition) and invoking the LPSolve routine. 

Thanks!

-bas

 

Hi everybody.

 

I'm using Maple these days to generate C code. More precisely, I use Maple to calculate high order derivatives. For example, I know that :

dt( u(x,t) ) = a(x) * dx( u(x,t) ) + b(x) * dx( p(x,t) )

dt( p(x,t) ) = c(x) * dx( p(x,t) ) + d(x) * dx( u(x,t) )

and I ask Maple to calculate the 5th time-derivative of u using these 2 properties. But in fact, I use 8 variables instead of 2 and PDEs are far more complicated.

Finally, I get thanks to Maple expressions of time-derivatives for my 8 variables.

 

please help me here:

I want to find the coefficients a, b , c of the following quadratic polynomial:

 P(x) = a*x^2+b*c+c

I know the following:

1. P(x0) = d

2. Derivative(P(x0)) = e

3. P(x1) = f

4. Derivative(P(x1)) = g

Thansk in advance.

regards,

new comer to Maple

 

 

Hi,

please help me here:

I have a polynomial:

P := x->a*x^3 + b*x^2+c*x+d:

Now, first i want to find a, b, c and d. I know the following:-

1. value of P at x0 let it be e. 2. value of derivative of P at x0, let it be f. 3. value of P at x1, let it be g 4. value of derivative of P at x1, let it be h.

i used the following command:

solve({P(x0) = e, (D(P))(x0) = f, P(x1) = g, (D(P))(x1) = h}, {c, d, a, b})

but i am not getting any output****

now i want to solve P(x) = 0