On 16/11/2021 3:45 a.m., Luigi Marongiu wrote:
Hello,
I have a dataframe with 3 values and that I would like to plot with contour:
```
head(df)
Y X Z
1 0.0008094667 50 1
2 0.0012360955 50 1
3 0.0016627243 50 1
4 0.0020893531 50 1
5 0.0025159819 50 1
6 0.0029426108 50 1
contour(df$X, df$Y, df$Z)
Error in contour.default(df$X, df$Y, df$Z) :
increasing 'x' and 'y' values expected
```
Y is increasing, whereas X is decreasing. How shall I set the function?
Thank you
Contour needs the Z data in a grid, with the X and Y data corresponding
to rows and columns. The interp::interp() function in the interp
package should be able to convert your data to this format; see its help
page. An alternative is the akima::interp() function, which may have
licensing issues.
Duncan Murdoch
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