I want to solve numerically the nonlinear problem 

a*(diff(y(x), x, x))+2*(diff(y(x), x))+exp(y(x)) = 0, y(0) = 0, y(1) = 0

by defining my own method defined as 

y_n+1=y_n+2*h*(-2*y_n+2*ln(2/(1+x))-(1/2)*a)^2/(a*(-4*y_n+4*ln(2/(1+x))-a-h*(4*y_n-4*ln(2/(1+x))+a+x+1)/a))

where h is the step-size. Please help me by letting me know how can I do this using Maple 11.

Hi!

My problem is that MapleSim refuses to use my interpolation table, and the simulation stops, because it says the first column is not in ascending order. Seems easy to solve, but it is not! The column IS in ascending order, I even arranged it several times in Excel. I can't figure out what is the problem.

If someone has time, I attached the interpolation table.

Best regards; e6.xlsx

Hey there i try to solve this system of equations. It is required that the left side of the equation only take positive values. Has someone an idea to fix this solution or has maybe another idea to help me.

> m[1] := 30; c[1] := 48000; c[0] := 20000; d[1] := 21; d[0] := 70;

> DGL1 := m[1]*(D(D(x)))(t)+d[0]*(D(x))(t)+d[1]*(D(x))(t)+c[0]*x(t)+c[1]*x(t)+50000 = -(1/1000)*c[1]*S-(1/1000)*d[1]*DS*((1/60)*(2*Pi*250))-(1/1000)*m[1]*DDS*((1/60)*(2*Pi*250))^2;

Hi,

I was wondering if anyone has suggestions how to get answer to this integral?

I know how to do a discrete approximation, but I am looking for the closed form.

c>0. n is an integer>0. If someone knows how to do specific values of n, that would be interesting too!

Also, replacing the Chebyshev function by a monomial in x (i.e. x^n) would be equivalent.

Thanks.

I have an older tablet PC on which I recently used Windows Journal for handwriting and storing my lecture notes (on the swivel screen with a stylus). However, Windows Journal is very basic (doesn't interact with Maple or anything else other than pasting images into it) and has very limited drawing capabilities (rectangles, ellipses, and only horizontal lines).

What tablet PC apps do you recommend for handwriting, drawing, etc. that interact well with Maple

Hi all,

I have a modelica custom componet which has inputs from angle/speed sensors and the output is a vector. I have an error "Attempted to retrieve property of unknown component". Can anyone see mistakes from the code below;

model basisFunction
    extends Maplesoft.Icons.CustomComponent;
    parameter Real bPen[sn*sn] "The normalized output for the basis function";
    parameter Integer sn=5 "The number of samples in each axist";

Hey there,

i have a differential equation in the form below and the expression c1*x(t) should only be positive. Has someone an idea how to solve this problem?

I want to write the equation of the line which passing the two point A(1, 1) and B(m+1, -2*m + 2) by using LinearAlgebra, but i can not write. Please help me. Thank you.

I've observed different behaviour in Maple 16 when invoking the plot() command with the coords=polar option.

Here's what Maple 15 produces:

...and here is what I get in Maple 16:

This is the first time I used the Maple software so I haven't known clearly about it. could you give me a document about " How to use Maple ".

Thank you.

Hmmm, I'm not sure if this possible but worth asking...and maybe useful for creating custom loop simulations:

I have a trajectory profile (via 1D Lookup Table in MapleSim) whose duration is for 10 seconds.

Is it possible to create a simulation with an end time greater than 10 seconds and have the 1D Lookup Table repeat its profile after it ends:

Example: Simulation end time = 20second. Thereby having the Lookup Table execute twice.

Suggestions on approach? Thanks.

Hi,

I need to generate random gaussian noise and every time when I run the simulation I need to use same noise sequences. So I need to assign a noise seed. This is like Matlab command "randn(state,'123456')". There is one similiar function "randn()" in Modelica, but it just allows us to assign a seed and generate a value which is always the same value during whole simulation unless we change the noise seed. Do you have any idea to generate this kind of Gaussian noise in MapleSim/Modelica?

i came into some questions when i wanted to solve a pde systerm as follows:

> pde := diff(u(x, y), y, y, y, y) = 0;
> sys := [pde, u(x, 0) = 0, u(x, a) = F0, (D[`$`(2, 2)](u))(x, 0) = 0, (D[2, 2](u))(x, a)-beta*(D[2](u))(x, a) = 0];
> pds := pdsolve(sys);
%;
Error, (in pdsolve/sys/info) found functions with same name but depending on different arguments in the given DE system: u(x, a), u(x, y). It is required an indication of the dependent variables

Hi,

I am trying to solve the following equation:

S:=(A+jB)*conjugate(C+jD)

where

A, B, C and D are all sum of sins and cosines.

Should I use COMBINE first and then solve, I am not getting what I want. hope there is a way to evaluate this function.

Looking forward to your kind replies

Thanks in advance

A.Q

Soton

Hi evryone.

Does anyone have experience on what is the best format to export an entire worksheet (code and graphics) out of Maple. I tried all different formats but none comes even close to being publication quality.

thanks a lot