[R] Contour - data points not in ascending order?

From: Kirkeby <ckir_at_vet.dtu.dk>
Date: Tue, 29 Jun 2010 01:52:44 -0700 (PDT)

Hello everyone.

I have been dealing with this for a while. I have built a spatial prediction model for densities of mosquitoes on a field, based om empirical data. I need to plot the field area with the predicted densities in a heatmap, contour or likewise, and compare it visually with i.e. a loess prediction (which works well). But no matter what I do, I cannot come across the problem that the x and y values should be in ascending order. Why is this necessary? I have tried using the unique() function as mentioned earlier, but it only removes some data points.
Please help me, I will appreciate any advice.

Best regards
Carsten Kirkeby

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