tapply and data.frames / vectors

[marleyhaupt1]

Hi Will,

I have been working on question 5 from Session 4 and I am struggling a bit with using tapply. I used expand.grid to create a data.frame of codons and amino acids. However, when I use an input vector of an arbitrary length it spits out an error message:

Error in tapply(input, codons) : arguments must have the same length

This makes sense to me since my input vector is length 1 (i.e, input <- "ATTACTAGGCTACGAA") and my data.frame is length 4 (first nucleotide, second nucleotide, third nucleotide, amino acid), but I am not sure how to fix it.

Also, I'm not sure which function I need to use in tapply to pull out the associated amino acid from the fourth column in my data.frame.

Is there anyway you can help me with this?

Thanks,
Marley

[willpearse]

Are you free Tuesday afternoon? Say around 2/3 pm?

[marleyhaupt1]

I have a meeting with Paul at 2, can I meet with you at 3?

[willpearse]

Yes. See you then. On Mon, Feb 6, 2017, 4:52 PM Marley J Haupt <[email protected]> wrote: I have a meeting with Paul at 2, can I meet with you at 3? — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#9 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ABLcUtWj_T3U05Q937WZwkLR30fmGbLEks5rZ7IzgaJpZM4L40-0> .