Change data to ensure requested data_range.
force.to.range(x, data_range, allow_append = FALSE)numerical vector, the input data.
numerical vector of length 2, the range into which to force the data values in 'x'. If `NULL`, the input data in 'x' is returned as is.
logical, whether to allow adding of more extreme data values. Allows a range larger than the data range. If set to `TRUE`, you will have to remove the extra values from the colors after generation of the colormap.
Modified version of x. The data will be clamped and / or at most 2 values may be appended to x.