datha | R Documentation |
The dataset used in Chapter 6 is derived from an image of a license plate, called license
and not provided in the package. The actual histogram of the grey levels is
concentrated on 256 values because of the poor resolution of the image, but
we transformed the original data as datha.txt
.
data(datha)
A data frame with 2625 observations on the following variable.
x
Grey levels
datha.txt
was produced by the following R code:
> license=jitter(license,10) > datha=log((license-min(license)+.01)/ + (max(license)+.01-license)) > write.table(datha,"datha.txt",row.names=FALSE,col.names=FALSE)
where jitter
is used to randomize the dataset and avoid repetitions
data(datha)
datha=as.matrix(datha)
range(datha)
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