Plotting two contourf plots on the same plot

Question

Elie Hatem 2020-6-20

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/552022-plotting-two-contourf-plots-on-the-same-plot

回答： Long Hoang Van 2021-9-24

采纳的回答： Elie Hatem

motorization_data.mat

在 MATLAB Online 中打开

Hello,

I am trying to plot two data matrices on the same plot. However, I do not know how to adjust the transparancy of one of the plots.

The code is shown below with the attached data of Z1 and Z2.

If I try to plot the on top of each other just like the code of figure (3), the data values of the Z1 will not fully be visible since the Z2 data will be on top of it.

Is there a way to adjust the transparency of the plotted Z2 data so that the the full Z1 data will be visible?

And, is there a possibility to change the color of each contourf plot?

Thank you for your time,

Elie Hatem

clear all;clc;
x=-pi:0.1:pi;
y=x;
[X,Y]=meshgrid(x,y);
load('motorization_data.mat','Z1','Z2')
figure(1)
contourf(X,Y,Z1,[0 0])
figure(2)
contourf(X,Y,Z2,[0 0])
figure(3)
contourf(X,Y,Z1,[0 0])
hold on
contourf(X,Y,Z2,[0 0])
hold off

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Elie Hatem 2020-6-21

在 MATLAB Online 中打开

Yes, I saw this link prior to asking my question.

I tried to use "fill". However, my plot was not plotting as desired.

I solved the problem by removing the columns which have zero elements in the X axis since it was clear that neither their X (which is zero) and their Y (belonging to the zero in the X) are part of the data. They were introduced when taking contourf was used. Moreover, the code below solved my problem:

figure(3)
j=contourf(X,Y,Z1,[0 0]);
hold on
contourf(X,Y,Z2,[0 0])
hold off
% Removing the unwanted values from j
i=0;
while (1)
    l_j=length(j);
    i=i+1;
    if i==143
        disp('i=143')
    end
    
    if j(1,i)==0
        j(:,i)=[];
        l_j=l_j-1;
    end
    
    if i==l_j
        break;
    end
end
%%
xi = j(1,:);
yi = j(2,:);
% Contour plot
figure(4)
contourf(X,Y,Z2,[0 0 ]);
% Transparent patch
hold on
fill(xi,yi,'m','FaceAlpha',0.5,'LineWidth',1);
hold off

madhan ravi 2020-6-21

Post it as answer.

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Answer 1

Elie Hatem 2020-6-21

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/552022-plotting-two-contourf-plots-on-the-same-plot#answer_455098

在 MATLAB Online 中打开

I solved the problem by removing the columns which have zero elements in the X axis since it was clear that neither their X (which is zero) and their Y (belonging to the zero in the X) are part of the data. They were introduced when taking contourf was used. Moreover, the code below solved my problem:

figure(3)
j=contourf(X,Y,Z1,[0 0]);
hold on
contourf(X,Y,Z2,[0 0])
hold off
% Removing the unwanted values from j
i=0;
while (1)
    l_j=length(j);
    i=i+1;
    if i==143
        disp('i=143')
    end
    
    if j(1,i)==0
        j(:,i)=[];
        l_j=l_j-1;
    end
    
    if i==l_j
        break;
    end
end
%%
xi = j(1,:);
yi = j(2,:);
% Contour plot
figure(4)
contourf(X,Y,Z2,[0 0 ]);
% Transparent patch
hold on
fill(xi,yi,'m','FaceAlpha',0.5,'LineWidth',1);
hold off