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Dear list, I have to compare two digital elevation models in raster format (geotiff). I then have to calculate the differences in altitude for each cell and make some statistics (basic as mean, median, std, range but also more "advanced" as RMSE) on that. I do not know very much how to proceed: 1) is it possible to import the geotiff in R? If so with which package? if not which is the

...lution: add an option prefix that implements simple conditionals. This could look something like "If supported HashKnownHosts HashKnownHosts no". This prefix should work anywhere a directive could appear. I don't think this needs complex boolean logic; with "If" and "IfNot" available, nested ifs could handle "and", and parallel ifs could handle "or" and "else". The only complex part here involves the definition of predicates. supported(SomeDirective) would handle the issues raised in this bug report, bug I can also imagine someone...