# get an average of collection with some conditions.
db.POINT_TOTAL_OBS_STATION_DATA.group(
{ cond: { obs_item_id : "OBSCD00074" }
, initial: {count: 0, total:0}
, reduce: function(doc, out) { out.count++ ; out.total += doc.v1 }
, finalize: function(out) { out.avg = out.total / out.count }
}...
2014년 7월 15일 화요일
2014년 7월 7일 월요일
R sample code for
Posted on 7/07/2014 02:48:00 오후 by 마크 with No comments
# R enviroments
-- to change java heap size
-- R_HOME/etc/Rprofile.site
options(java.parameters = c("-Xmx16g","-Dfile.encoding=UTF-8"))
-- to read UTF-8 type.
f <- file("d:/parser.txt", blocking=F,encoding="UTF-8")
txtLines <- readLines(f)
# 1. how to collect a stock info.
install.packages("fImport")
library(fImport)
s_e <- yahooSeries("005935.KS")
plot(s_e)
#...
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