[R] Help with if else statement

[Ana Marija]

Hello,

I have a data frame which looks like this:

> head(pt)
     eidQ phenoQ phenoH
1 1000017     -9     -9
2 1000025     -9     -9
3 1000038     -9      1
4 1000042     -9     -9
5 1000056     -9     -9
6 1000074     -9     -9
7   1000038     -9      1
8  1000127      2      1
9  1000690      2     -9
10  1000711      2     -9
11 1001431      2      1
12 1001710     -9      1

I would like to create the 3rd column called "pheno" which would have
these values:
-9,-9,1,-9,-9,-9,1,2,2,2,2,1

so in other words:
-if -9 appears in both phenoQ and phenoH I will have -9 in pheno
-if 2 appears in any of phenoQ or phenoH I will have 2 in pheno
-if I have -9 and 1 or 1 and -9 in those columns I will have 1 in pheno
-if I have -9 and 2 or 2 and -9 in those columns I will have 2 in pheno

Can you please tell me how my if else statement would look like or any
other way how to do that in R if my data frame name is "pt"

Thanks
Ana
Ana