MaplePrimes Questions

Search Questions:

Latest Questions Latest Questions Feed

For the function


F(u)= u(x)u(y)                    


the first Frechet derivative is given as


F'(u)v = v(x)u(y) + u(x)v(y)

that is the Frechet derivative of F(u) acting on v.


So how do I get maple to give me the Frechet derivative of  F(u)= u(x)u(y)  ?


I have an equation which has no explicit solutions, but I would like to plot the solutions. I have construction a function which, for every argument, produces a numerical answer to the equation, but this function can't be plotted. Below is a simplified (equation has trivial explicit solution) function which shows the difficulty.

> Fe := p->fsolve(eval(1-x+p = x), x)
p -> fsolve(eval(1 - x + p = x), x)

Here we exercise the function to produce floating results.


My question is quite simple : how can we define the size in pixels of a plot ?

After plotting we can change the size of the image with the mouse but it is quite approximative.

For example is it possible to display (by default) all the plots of a worksheet in 800x800 pixels ?

Thank you very much.

Hello everybody !

I am trying to display some solutions for the differential equation :


diff(y(x), x) = y(x)*(4.384477959*10^15/(1/(y(x)*x^2))^.25-1.330000000*10^16/x)/(x*(1.102240000*10^15*y(x)^2-2.192238980*10^15/(1/(y(x)*x^2))^.25))

When I make a DEplot, with the command : DEplot(

I have a rather simple 2nd order ODE that I'm trying to plot. First, the ODE:

deqn1 := diff(x(t), (t$2)) = -2*(diff(x(t), t))-25*x(t)

Then the DEplot:

DEplot(deqn1, t = 0 .. 10, [[x(0) = 1, (D(x))(0) = 0]], stepsize = .1, linecolor = blue, thickness = 1)

And the error message:

Error, (in dsolve/numeric/process_input) invalid specification of initial conditions, got (D(x))(0) = 0

Now, anytime an equation value is a constant (x(0...

Help!!   How can I get maple 14's fonts to be smoothed?  In Windows it seems to pick up the OS setting on smoothing fonts, but not under K/ubuntu 10.10




I want to make a model with an inner moving circle touching a non-moving, stiff outer circle. 2 differential equations describe the movement of the inner circle, i already have modelled thisand i have the x and y coordinates of the most "exposed point" which will touch the outer circle, as output variables (i could also add the derivatives as output). When the 2 circles touch, i want to "tell" the differential equation model the 2 new derivatives for x and y...

Hi I have just begun to use Maple and there are some function I am not able to use.I have 3 questions

  1. I would like to plot the normal function (given a specific expected value and variance): is there a simple function to do it or I just have to re-write the function inside Maple?
  2. is it possible to draw a line for a specific value of the graph, let's say x=1 without drawing an entire line for the graph (just to highlight the point)
  3. is it possible...



The surface in above image is a portion of the graph of
some mathematical equation.

Let's do some brainstorming:
Can you guess what's inside the surface?

Hello, MaplePrimes!

Could you please tell me, how to select which variables are “input” and which ones are “output” during a custom component definition in MapleSim?

Thank you.


Currently I have to deal with this nonlinear differential equations. The "Newton iteration is not converging" is the main problem. Could anyone propose some solutions?

Thanks a lot.

-EM*iner*(diff(f(x), `$`(x, 4)))-(3/2)*EM*A*nonln*(diff(f(x), `$`(x, 2)))*(diff(f(x), `$`(x, 1)))^2+u*EM*A*nonln*(9*(diff(f(x), `$`(x, 1)))*(diff(f(x), `$`(x, 2)))*(diff(f(x), `$`(x, 3)))+3*(diff(f(x), `$`(x, 2)))^3+(3/2)*(diff(f(x), `$`(x, 1)))^2*(diff(f(x), `$`(x, 4...


I use the following commands to generate the frequency response of a system,


sys := TransferFunction(10/(s*(s+1)*((1/4)*s^2+1))):


but the figure which maple outputs seems not good because the ranges of x-y axises are very large. I try to use NyquistPlot(sys,view=[-20..20,-20..20...

v1 := evalf(30*Pi/(180.));
v2 := evalf(120*Pi*(1/180));
r1 := 600;
r2 := 1800;

Hey Mapleprimes,

 I have a set of 3x4 Matrices and i need to filter some out, but cant find the right maple commands. Example Matrix:

[2 4 0]    row 1

[0 2 2]    row 2

[0 2 2]    row 3

[4 4 4]


row 2 = row 3


1. If all elements of a matrix have a common divider, such as 2 in the example matrix, I need to store the simplified matrix, meaning the one with all values divided by the common divider....

I am setting up a new machine.


I was running Maple 13 on another machine running Fedora Linux 13.   I don't remember if I had any problems setting it up, but it was running fine.


But I removed it from the old machine and installed it on the new machine which is running Fedora 14 Linux.


Maple 13 loads but I get a message from SELInux about a problem with Maples's mserver and execcstack.   ...

First 774 775 776 777 778 779 780 Last Page 776 of 1302