Multiple conditions in if statements in R

Question

I am trying to cut down a list of gene names that I have been given. I'm trying to eliminate any repetitive names that may be present but I keep getting an error when running my code:

counter=0 i=0 j=0 geneNamesRevised=array(dim=length(geneNames)) for (i in 0:length(geneNamesRevised)) geneNamesRevised[i]="" geneNamesRevised for (i in 1:length(geneNames)) for (j in 1:length(geneNamesRevised)) if (geneNames[i]==geneNamesRevised[j]) { break } else if ((j==length(geneNamesRevised)-1) && (geneNames[i]!=geneNamesRevised[j])) { geneNamesRevised[counter]=geneNames[i] counter++ }

The error message is a repetitive string of :

the condition has length > 1 and only the first element will be usedthe condition has length > 1 and only the first element will be usedthe condition has length > 1 and only the first element will be used

and this error message is for the last "else if" statement that has the '&&'.

Thank you!

just try only one &. does it work?

Jan Sila
– Jan Sila

2017-02-08 00:01:31 +00:00
Commented Feb 8, 2017 at 0:01 — Jan Sila
– Jan Sila, Commented Feb 8, 2017 at 0:01

IRTFM · Accepted Answer · 2017-02-08 00:21:45Z

Why not just

geneNamesRevised <- unique( geneNames )

... which returns a shortened list. There is also a duplicated function that can be used to remove duplicates when negated.

score 1 · Accepted Answer · 2017-02-08 20:45:21Z

There are a few problems in your code.

1) The else is incorrectly specified - or not :) thanks @Mohsen_Fatemi

2) & is usually what you need rather than &&

3) counter++ isn't R

Copy the code below and see if it runs

 for (i in 1:length(geneNames)){ for (j in 1:length(geneNamesRevised)){ if (geneNames[i]==geneNamesRevised[j]) { break } else { if ((j==length(geneNamesRevised)-1) & (geneNames[i]!=geneNamesRevised[j])) { geneNamesRevised[counter]=geneNames[i] counter <- counter + 1 } } } }

Edit

4) also you were missing braces for your fors

Mohsen_Fatemi · Accepted Answer · 2017-02-08 00:02:43Z

use & instead of && ,

else if ((j==length(geneNamesRevised)-1) & (geneNames[i]!=geneNamesRevised[j]))

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