r - Merge values of a factor column -


column data$form contains 170 unique different values, (numbers 1 ~800). merge values (e.g 10 radius/step).

i need in order use:

colors = rainbow(length(unique(data$form)))

in plot , provide better visual result.

thank in advance help.

you can use %/% group them , mean combine them , normalize scale them. 

 # if want 20 groups:  groups <- sort(form) %/% (800/20)    x <- c(by(sort(form), groups, mean))   x <- normalize(x, true) * 19 + 1          0         1         2         3         4   1.000000  1.971781  2.957476  4.103704  4.948560          5         6         7         8         9   5.950617  7.175309  7.996914  8.953086  9.952263         10        11        12        13        14  10.800705 11.901235 12.888889 13.772291 14.888889         15        16        17        18        19  15.927984 16.864198 17.918519 18.860082 20.000000

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