Returns the sum of a ml.data.frame field.
## S4 method for signature 'ml.col.def'
sum(x, na.rm = FALSE)
a ml.data.frame field.
not currently used.
## Not run:
locConn <- ml.connect()
# create a ml.data.frame based on a search
mlIris <- ml.data.frame(locConn, collection = "iris")
## End(Not run)
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