error using contour z must be at least a 2x2 matrix

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Aishwarya Bangalore Kumar
回答： ZEESHAN AHMED 2023-1-18
x = (pi/2):0.1:(2*pi);
y = (pi/2):0.1:(2*pi);
z = sin(x) + cos(y);
contour3(x,y,z)
I need a contour plot of x,y,z variables. How do i get it?

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采纳的回答

Birdman
Birdman 2018-2-14
Use meshgrid.
x = (pi/2):0.1:(2*pi);
y = (pi/2):0.1:(2*pi);
[X,Y]=meshgrid(x,y);
z = sin(X) + cos(Y);
contour3(X,Y,z)
  2 个评论
Connor Fitzgerald
Connor Fitzgerald 2021-1-9
@Birdman, but why meshgrid?
My code with your implementation looks like:
plotX = app.UITablePlot.Data(:,2);
plotY = app.UITablePlot.Data(:,3);
plotZ = app.UITablePlot.Data(:,4);
[plotX2, plotY2] = meshgrid(plotX, plotY)
contour3(app.UIAxes, plotX2, plotY2, plotZ)
However I still receive the same error.

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更多回答（1 个）

ZEESHAN AHMED
ZEESHAN AHMED 2023-1-18
How to plot contour map if I have individual data for example
  1. Torque (50001x1)
  2. speed (50001x1)
  3. efficiency(50001x13)
All of the data is taken from simulink in matrices.

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