how to plot Contour Plot?

3 次查看（过去 30 天）
Radhika Kulkarni
Radhika Kulkarni 2019-12-15
评论： Star Strider 2019-12-15
I have 3 variables data in xls file. I want to plot contour plot of one variable against other 2 variables on x and y axis. How do I do this?

请先登录，再回答此问题。

采纳的回答

Star Strider
Star Strider 2019-12-15
I assume your variables are vectors. If they are gridded, it is only necessary to use the reshape function to form them into matrices.
If they are not gridded, something like this will work:
x = rand(20, 1);
y = rand(20, 1);
z = rand(20, 1);
xv = linspace(min(x), max(x), 50);
yv = linspace(min(y), max(y), 50);
[X,Y] = ndgrid(xv, yv);
Z = griddata(x, y, z, X, Y);
figure
contourf(X, Y, Z)
Experiment to get the result you want.
  4 个评论
显示 2更早的评论
Radhika Kulkarni
Radhika Kulkarni 2019-12-15
My contour lines value is showing as 80.34678, how do I round it of to 80 and so on?
Star Strider
Star Strider 2019-12-15
If you know the values you want for the contours, the easiest way is to specify them in a vector as the fourth argument to contourf:
x = rand(20, 1);
y = rand(20, 1);
z = rand(20, 1)*100;
xv = linspace(min(x), max(x), 50);
yv = linspace(min(y), max(y), 50);
[X,Y] = ndgrid(xv, yv);
Z = griddata(x, y, z, X, Y);
colorcol = linspace(0.1, 0.9, 10); % Define Number Of Intensities (Here 10)
cmap = zeros(numel(colorcol), 3); % Define ‘colormap’ Here
cmap(:,2) = colorcol(:); % Choose Green ([R G B])
figure
contourf(X, Y, Z, [20 40 60 80], 'ShowText','on')
colormap(cmap)
Here the plot shows only the contours at [20 40 60 80]. Specify whatever values you want.

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Contour Plots 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by