dataframe - copying data from one data frame to other using variable in R -

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i trying transfer data 1 data frame other. want copy 8 columns huge data frame smaller 1 , name columns n1, n2, etc..

first trying find column number need copy using this

x=as.numeric(which(colnames(old_df)=='n1_data'))

then pasting in new data frame way

new_df[paste('n',1:8,'new',sep='')]=old_df[x:x+7]

however, when run this, new 8 columns have same data. however, instead if directly use value of x, want like

new_df[paste('n',1:8,'new',sep='')]=old_df[10:17]

so questions are

  • why not able use variable x. added as.numeric make sure number not list. however, not seem help.
  • is there better or more efficient way achieve this?

if i'm understanding question correctly, may overthinking problem.

library(dplyr); new_df <- select(old_df, n1_data, n2_data, n3_data, n4_data,                          n5_data, n6_data, n7_data, n8_data);  colnames(new_df) <- sub("n(\\d)_data", "n\\\\1", colnames(new_df));

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