From help-octave-request at bevo dot che dot wisc dot edu  Sat Dec  9 15:18:15 2000
Subject: Re: Octave's contour function
From: Fernando Fraga e Silva <fraga dot silva at ig dot com dot br>
To: Jonathan M Hill <jmhill at ece dot WPI dot EDU>
Cc: help-octave at bevo dot che dot wisc dot edu
Date: Sat, 9 Dec 2000 18:55:07 -0200

On Quinta 07 Dezembro 2000 20:36, Jonathan M Hill wrote:

I'm very thanks for the attention , but I've just learned how to use the 
function ,  and decided reply a sample code using the function showing how to 
use it to plot a potential field .

>      I was just playing with the contour function the other day and
> managed to make a simple example.  I used the online help to
> construct the  example.  I'm sorry that I don't have much experience
> with this.

I`ve solved my problem and make a simple example using contour :
 
==========================================================
#!/usr/bin/octave -qf
# Plota as linhas de corrente do escoamento ao redor de um cilindro submerso 
em um escoamento uniforme , irrotacional , de ar

Numero_de_elementos = 100;

x = linspace(-10 , 10 , Numero_de_elementos);
y = linspace(-10 , 10 , Numero_de_elementos);
title("Linhas de corrente");
xlabel("coordenada X");
ylabel("coordenada Y");

U = 2.3;        # Velocidade do escoamento ao longe
a = 10;         # Parâmetro geométrico
eps = 1E-5   # valor infinitesimal para evitar divisão por zero

for i = 1:Numero_de_elementos
    for j = 1:Numero_de_elementos
        F(i,j) = y(j)*U - y(j)*U*a^2 / (x(i)^2 + y(j)^2 + eps);
    endfor
endfor

contour( F , 50 , x , y );
sleep(30);

==============================================================

---
Fernando Fraga e Silva - beakman at iname dot com
Undergraduated Mechanical Engineering Student from University of São Paulo



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