Can I call this plot as Contour plot?
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Hello all,
Refer to the code below
clear all;
x=sin(2*pi*1000*((0:0.1:200)/10000));
y=cos(2*pi*1000*((0:0.1:200)/10000));
figure
plot(x,y)
xlabel ('Values of Sine');
ylabel('Values of Cos');
Can I call the plot I obtain as "Contour plot of x & y" ? What plot it is exactly?
采纳的回答
Matt Tearle
2011-3-19
1 个投票
What you're doing is called a parametric plot - x(t) against y(t) for a parameter variable t.
5 个评论
Raviteja
2011-3-19
Matt Tearle
2011-3-19
A contour plot is a method for visualizing a scalar function of two variables: z = f(x,y). The contours are curves defined by setting z equal to a fixed value: f(x,y) = c
You can use a contour plot to visualize an implicitly-defined function f(x,y) = c by looking for just the single contour at level c.
Raviteja
2011-3-20
Jiro Doke
2011-3-20
Have you looked at the documentation for "contour"? It has a couple of examples.
http://www.mathworks.com/help/matlab/ref/contour.html
Matt Tearle
2011-3-20
Ok, so x^2 + 2y^2 = 5 is an equation for an ellipse. Two ways to plot this in MATLAB:
Parametrically
t = linspace(0,2*pi);
x = cos(t)*sqrt(5);
y = sin(t)*sqrt(5/2);
plot(x,y)
Using contours
[x,y] = meshgrid(linspace(-2.5,2.5));
z = x.^2 + 2*y.^2;
contour(x,y,z,[5 5])
更多回答（1 个）
Sean de Wolski
2011-3-19
Sure:
%your stuff followed by:
title('Contour plot of x & y');
1 个评论
Matt Tearle
2011-3-19
::rimshot:: Thank you, you've been great. Don't forget to tip your waiter.
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