r - loop over colums with semi like columnnames -

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i have following variable , dataframe

welltypes <- c("lc","hc") qccast <- data.frame(   lc_mean=1:10,   hc_mean=10:1,   bc_mean=rep(0,10) )

now want see welltypes selected(in case lc , hc, different ones.)

for(i in 1:length(welltypes)){ qccast$welltypes[i]_mean }

this not work, know. how loop on columns?

and has happen variable wise, because welltypes of unkown size.

the second argument $ needs column name of first argument. haven't run code, expect welltypes[i]_mean syntax error. $ similar [[, can use paste create column name string , subset via [[.

for example:

qccast[[paste(welltypes[i],"_mean",sep="")]]

depending on rest of code, may able instead.

for(i in paste(welltypes,"_mean",sep="")){   qccast[[i]] }

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