Difference between revisions of "MATLAB:Contour Plots"
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| (One intermediate revision by the same user not shown) | |||
| Line 12: | Line 12: | ||
surfc(x, y, z) | surfc(x, y, z) | ||
shading interp | shading interp | ||
| − | colormap | + | colormap copper |
%% Contour plot | %% Contour plot | ||
figure(2) | figure(2) | ||
[C, H] = contour(x, y, z); | [C, H] = contour(x, y, z); | ||
| − | colormap | + | colormap copper |
clabel(C, H) | clabel(C, H) | ||
| Line 23: | Line 23: | ||
figure(3) | figure(3) | ||
[C, H] = contour(x, y, z, 5); | [C, H] = contour(x, y, z, 5); | ||
| − | colormap | + | colormap copper |
clabel(C, H) | clabel(C, H) | ||
| Line 29: | Line 29: | ||
figure(4) | figure(4) | ||
[C, H] = contour(x, y, z, [-.75:.25:.75]); | [C, H] = contour(x, y, z, [-.75:.25:.75]); | ||
| − | colormap | + | colormap copper |
clabel(C, H) | clabel(C, H) | ||
</source> | </source> | ||
| Line 42: | Line 42: | ||
surfc(x, y, z) | surfc(x, y, z) | ||
shading interp | shading interp | ||
| − | colormap | + | colormap copper |
%% Contour plot | %% Contour plot | ||
figure(2) | figure(2) | ||
[C, H] = contour(x, y, z); | [C, H] = contour(x, y, z); | ||
| − | colormap | + | colormap copper |
clabel(C, H) | clabel(C, H) | ||
| Line 53: | Line 53: | ||
figure(3) | figure(3) | ||
[C, H] = contour(x, y, z, 5); | [C, H] = contour(x, y, z, 5); | ||
| − | colormap | + | colormap copper |
clabel(C, H) | clabel(C, H) | ||
%% Contour plot specifying contour locations | %% Contour plot specifying contour locations | ||
figure(4) | figure(4) | ||
| − | [C, H] = contour(x, y, z, [-.75:.25:.75]); | + | [C, H] = contour(x, y, z, [-1.75:.25:1.75]); |
| − | colormap | + | colormap copper |
clabel(C, H) | clabel(C, H) | ||
</source> | </source> | ||
Latest revision as of 19:19, 30 September 2014
MATLAB is capable of making contour plots and also of labeling the contours using specified values. The following are some examples. Be sure to look up MATLAB:Plotting Surfaces first to understand how MATLAB makes surfaces.
Example 1: Pinched
[r, theta] = meshgrid(linspace(0,1,20), linspace(0, 2*pi, 50));
x = r.*cos(theta);
y = r.*sin(theta);
z = cos(theta).*r;
%% Surface with contours
figure(1)
surfc(x, y, z)
shading interp
colormap copper
%% Contour plot
figure(2)
[C, H] = contour(x, y, z);
colormap copper
clabel(C, H)
%% Contour plot specifying 5 contours
figure(3)
[C, H] = contour(x, y, z, 5);
colormap copper
clabel(C, H)
%% Contour plot specifying contour locations
figure(4)
[C, H] = contour(x, y, z, [-.75:.25:.75]);
colormap copper
clabel(C, H)
Example 2: Egg Crate
[x, y] = meshgrid(linspace(0, 3, 64), linspace(0, 1, 41));
z = -(1-cos(4*pi*y)).^(1/4).*(1-cos(2*pi*x)).^(1/4);
%% Surface plot with contours
figure(1)
surfc(x, y, z)
shading interp
colormap copper
%% Contour plot
figure(2)
[C, H] = contour(x, y, z);
colormap copper
clabel(C, H)
%% Contour plot specifying 5 contours
figure(3)
[C, H] = contour(x, y, z, 5);
colormap copper
clabel(C, H)
%% Contour plot specifying contour locations
figure(4)
[C, H] = contour(x, y, z, [-1.75:.25:1.75]);
colormap copper
clabel(C, H)
