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250
2013 Aug 16
1
as.Date.character speed improvement suggestion
...x)) {
ux <- unique(x)
idx <- match(x, ux)
y <- as.Date.character(ux, ...)
return(y[idx])
}
as.Date.character(x, ...)
}
## Example1: Construct a 1-million length character vector of 1000 unique dates
## By considering only unique values, speed is >250x faster
> dtch <- format(sample(Sys.Date()-1:1000, 1e6, replace=TRUE))
> system.time(dt1 <- as.Date.character(dtch))
user system elapsed
12.630 23.628 36.262
> system.time(dt2 <- as.Date.character2(dtch))
user system elapsed
0.117 0.019 0.136
> identical(dt1...
2006 Jan 11
0
File_column : how can I resize/convert/whatever an image according to form-submitted values?
...mbnail" => "100x100>" }
private
def resize_image
# stuff that processes the image with the form-provided values
[:resize_dimension] (can be "w" (width) or "h" (height) ) and [:resize_to],
so as to obtain the equivalent of "convert -resize ''250x'' stuff.jpg" or
"convert -resize ''x100'' stuff.jpg"
end
end
What should I put in that resize_image callback function? Would a callback be
the DRY way, to begin with?
Any tips, ideas, previous experiences, anyone?
TIA,
Dominique Rose-Rosette