r - What does raster$fun do? -

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i trying use code referenced in this post can't figure out why necessary run raster.list$fun = mean. (see answers in link) can tell me does?

when using do.call() have supply arguments list:

in provided link do.call function used mosaic list of raster images. first argument of function do.call() function want use (in case mosaic), , sencond argument list of additional parameters. in case raster images plus function should used overlapping areas during mosaicing (here mean).

so typing raster.list$fun = mean add new element called "fun" list, contains r-base function mean(). used input mosaic function invoked do.call.

for more information please pages ?do.call , ?mosaic. hope helps.


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