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How to plot contour of an xy plot with a constant value?
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I have several data sets (I have selected two lines in this case. I want to plot them as contour lines with different z values. For example, I want to plot the xy-data with z values as 40 and 30. As the lines extend beyond my area of interest, the current are of interest is 0 to 120 in x and 0 to 220 in y axis. I tried using meshgrid which I have used for plotting contour plots but I cannot convert these known values of lines into contours.Your help will be much appreciated.
xy = readtable('xy_data.xlsx');
x1 = xy.x40;
y1 = xy.y40;
x2 = xy.x30;
y2 = xy.y30;
figure
rectangle('Position',[0 0 120 220]) % the contour line can be only drawn in this box
axis equal
hold on
plot(x1,y1)
plot(x2,y2)
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采纳的回答
Mathieu NOE
2023-12-11
hello
why not simply use xlim and ylim to plot the required area ?
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1565449/image.png)
xy = readtable('xy_data.xlsx');
x1 = xy.x40;
y1 = xy.y40;
x2 = xy.x30;
y2 = xy.y30;
figure
% rectangle('Position',[0 0 120 220]) % the contour line can be only drawn in this box
axis equal
hold on
plot(x1,y1)
plot(x2,y2)
xlim([0 120])
ylim([0 220])
更多回答(1 个)
Nipun
2023-12-21
Hi UH,
I understand that you have two sets of xy-data representing lines and want to create a contour plot with specified z values. The area of interest for the plot is defined as 0 to 120 in the x-axis and 0 to 220 in the y-axis.
Based on the provided information, I see that you have attempted to use meshgrid for plotting contour plots but are facing challenges converting the known values of lines into contours.
I recommend using "xlim" and "ylim" to plot the required area. The link to documentation is attached below
I have modified your code to help you with the same
xy = readtable('xy_data.xlsx');
x1 = xy.x40;
y1 = xy.y40;
x2 = xy.x30;
y2 = xy.y30;
figure
%% Commenting the rectangle function, use limits instead
% rectangle('Position',[0 0 120 220]) % the contour line can be only drawn in this box
axis equal
hold on
plot(x1,y1)
plot(x2,y2)
%% adding limits
xlim([0 120]);
ylim([0 220]);
Link to documentation:
- Set or query x-axis limits - MATLAB xlim - MathWorks India
- Specify Axis Limits - MATLAB & Simulink - MathWorks India
Hope this helps.
Regards,
Nipun
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