[EMAIL PROTECTED] wrote:
Hello
I am new to R and I cannot overcome the 2 problems
1.Defining my own color scale for a value on a scatterplot 2.Adding legend showing values for colours
I have a set of points in area of my research with coordinates X and Y and
a value which I would like to show with colors.
#values for points are residuals from regression
stepmod = step(wmodzad, direction="both")
#I am adding residuals to original data to get coordinates for residuals
expzad = cbind(zadrz, residuals(stepmod))
#I want to have colors for classes defined as standard deviation from mean
std = sd(residuals(stepmod)) mn = mean(residuals(stepmod)) sdclas = seq(-3*std+mn, 3*std+mn, by=std)
#I would like to have colors from green to red, but I can't do it so I am doing only
palette( rainbow(6) )
You could either use something like the RColorBrewer package, or specify the colors yourself using, e.g., rgb().
#I am dividing residuals into earlier defined classes by
residsd = cut(residuals(stepmod), sdclas, labels=FALSE)
#or by (THEN POINTS DON'T APPEAR ON PLOT IN NEXT STEP)
residsd = cut(residuals(stepmod), sdclas)
# I am creating a plot
plot(expzad$X,zadrz$Y,col=residsd, pch=15 )
# I would like to add legend to plot showing values for colours from plot but I can't do this. Simply help for 'legend' on my level of knowledge on R is not helpfull.
loc = locator(1) legend(loc$x, loc$y, legend = levels(residsd) )
I guess you want something like
legend(loc$x, loc$y, col = residsd, legend=levels(residsd), pch=15)
Uwe Ligges
Thanks in advance for your help
Rafal Buczkowski
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