Dear All,

I tried to plot contour lines using R function contour, but got the results
which are not expected.

require(RTOMO)
x <- seq(-1,1,0.1)
y <- seq(-1,1,0.1)
xy <- meshgrid(x,y)

z <- xy$x^2+ 3*xy$y^2
contour(x,y,z,col="blue",xlab="x",ylab="y")

The above code gave me the contour graph for z=3*x^2+y^2 rather than
z=x^2+3*y^2. Is anyone know the reason? Thank you very much in advance.

David

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