How do I add a new column to a dataframe after each for loop?

Question

I'm trying to save a numeric vector that is calculated in a for loop, and then save that into a new column in a dataframe at the end of the for loop.

d.dataframe = NULL
for (i in 1:length(viral_raw)) {

  scores <- PWMscoreStartingAt(human.pwm, viral_raw[[i]], starting.at = 1:99)

  d.dataframe$i <-scores
}

But right now its overwriting the i'th column everytime

delete d.dataframe$i line and then add d.dataframe=cbind(d.dataframe,scores) — User7598
– User7598, Commented Nov 8, 2016 at 16:04
Just FYI, d.dataframe$i <-scores doesn't overwrite the ith column, it overwrites the column named "i" in each iteration. See the section "Recursive (list-like) objects" in the help file from help("$"), although this entire help file is worth a careful read. — lmo
– lmo, Commented Nov 8, 2016 at 16:40

User7598 · Accepted Answer · 2016-11-08 16:36:17Z

1

As I commented above, you should delete d.dataframe$i line and then add d.dataframe=cbind(d.dataframe,scores)

The final code will look like:

d.dataframe = NULL
for (i in 1:length(viral_raw)) {

  scores <- PWMscoreStartingAt(human.pwm, viral_raw[[i]], starting.at = 1:99)

  d.dataframe=cbind(d.dataframe,scores)
}

answered Nov 8, 2016 at 16:36

User7598

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