Hello Everyone

I have the data long format and I want to draw the contour plot with it

x1 x2 x3
0   1    2
0   2    1
0   3    5
1   1    4
1   2    2
1   3    3


when I am using contour(x1,x2,x3,col=heat.colors) or fill.contour
its giving me an error that increasing x and y expected


So please tell me what is the right function to draw contour when the data
is not ordered and you cant order it.

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