## Laplace Transform to Solve a Differential Equation...

Hello everyone,

I am trying to solve a differential equation using dsolve command for laplace transform.

In Equation 2, a is a constant and x(t), b(t), u(t) are functions.

What is the "_U1" in the output (4)? Is it because I have defined x(t), b(t), u(t) as functions?

## starting with maple for engineering

Maple 18

Good book to start studying maple for engineering.

http://www.gatewaycoalition.org/includes/display_project.aspx?ID=279&maincatid=105&subcatid=1019&thirdcatid=0

Lenin Araujo Castillo

## How do i get a envolope plot base on odeplot graph...

Hello,

I am so happy that this is my first time to ask a quension here.

Like the graph pasted down, i can get a graph of a ode with the odeplot in time domain.

Furthermore, i just want to get a envelope plot based on the time domain graph, just like showed in

the example graph here,

i have no way to plot it in maple,

Does anyone know a method to plot it in maple?

## Short hand notation for sine and cosine...

Hello everyone,

Is it possible to define a short hand notation for sine and cosine functions and make the output expressed in terms of the defined notation?

For example the matrix below uses c1 instead of cos(theta1) and s2 instead of sin(theta2).

The reason I want to do this is that I am dealing with really long matrices and I need some sort of way to minimize the expressions.

Thank you!

Canberk

## how do i segregate different term in long PDE in m...

I am new to maple. how do i segregate different term in long PDE in maple

## Moment of a force using vectors

Maple 18

The development of the calculation of moments using force vectors is clearly observed by taking a point and also a line. Different exercises are solved with the help of Maple syntax. We can also visualize the vector behavior in the different configurations of the position vector. Applications designed exclusively for engineering students. In Spanish.

Moment_of_a_force_using_vectors_updated.mw

Lenin Araujo Castillo

## "Large sortie de plus de 1000000 nœuds" ...

I've compiled a program with Maple 18. unfortunately it gives me the message "Large sortie de plus de 1000000 noeuds". If any one have any idea to resolve this problem. Thanks you very mutch for your support.

## Solving Simultaneous Equations With Maple...

I tried to solve 4 simultaneous equations but the result is an empty matrix.

Is that because there is no solution or did I make something wrong?

SimEquations.mw

## Highlighting the intersection of two surfaces ...

I want to highlight the intersection between 2 graphs; pp(m,a) and the plane m=-0.2

PP := .8707945038*exp(-50.00000000*(m-0.842e-1)^2+(2.745342070*(m-0.842e-1))*(a-2.3722)-.1046792095*(a-2.3722)^2)

How can I do that?

Thank you

## How do I solve and plot a coupled differential eq...

,Hello friends

.I want to plot a coupled differential equation numerically  but I dont know whats wrong with the loops

numeric4.mw  .pdfnumeric4.pdf

## Issue with 3d plot...

I experience an issued with a 3d plot. This is my code and I get: "Warning, expecting only range variables [H[s], H[j]] in expression eq to be plotted but found name eq." as a return from Maple.

restart;

eq = c[1]-abs(H[s])^2*sigma^2/abs(H[j])^2;

c[1] := 2;

c[2] := 4;

sigma := 1;

tmp := plot3d(eq, H[s] = .1 .. 2, H[j] = 0 .. 5, view = 0 .. 8,

axes = boxed, labels = [H[s], H[j], P[j]],

filled = [style = surface, transparency = .2]); plots:-display(tmp, view = 0.1e-1 .. 8)

## solving Ax=b, where A contains one symbol in MAPL...

Dear Maple users,

I am solving a system of linear equations Ax=b where A is a matrix (243*241) which contains a rational polynomial of unknown "kappa" along with floating numbers. As suggested in some other posts I am using Linear algebra package with the LinearSolve command and option "solve" to find out unknown vector x. b is a vector having entries zero and 1. The system is such that two equations are redundant but it is difficult to recognise which two are redundant and hence for the time being I am keeping them in the matrix. (For a known value of kappa (say kappa=2) I have checked that two equations are redundant.) For the reference, the matrix and the right-hand vector b is attached as text.

There are two issues

1) Maple takes very long time (12 hours and so) to get x=b\A;

2) The result is a long expression i.e.  x[i] is a rational polynomial in kappa; a very long rational polynomial which I am importing as a text. I am not sure if maple exports all terms in the polynomial as for the different value of kappa I see Ax-b >0.

How can I overcome this problem? Any help will be greatly appreciated.

## Vector space with projections and forces

Maple 18

With this application you will learn the beginning of the study of the vectors. Graphing it in a vector space from the plane to the space. You can calculate its fundamental characteristics as triangle laws, projections and strength. App made entirely in Maple for engineering students so they can develop their exercises and save time. It is recommended to first use the native syntax then the embedded components. In Spanish.

Vector_space_with_projections_and_forces_UPDATED_2018.mw

Vector_space_with_projections_and_forces_UPDATED.mw

Movie #01

Movie #02

Movie #03

Lenin Araujo Castillo

## How to solve a differencial equations for oscillat...

Hello,

I would like to ask you for a help with solving a differencial equations for oscillator damped by a constant friction force (no damping force proportional to the velocity!)

General solultion:

Where

The amplituce A is decreasing by C at each turning point and center of the ascillatory motion moves: x = -C/2 or x = C/2

Moving:

where

How to create a graphic output of movement according to equation x(t) similar to graph mentioned below?

Thank a lot for your help. I have been working on this task for several weeks without success.

Tom

## Displacement and distance traveled with vectors

Maple 18

In this app you can use from the creation of curve, birth of the position vector and finally applied to the displacement and the distance traveled. All this application revolves around the creation of a path and the path of a particle over this generated by vectors. You will only have to insert the vector components and the times to evaluate. Designed for engineering students guided through Maple. In Spanish.

Video