math - replace NA with data from another column in R -


i know how make na's blanks following code:

 imileft   imiright     imiavg       na         na         na       na   71.15127         na 72.18310   72.86607   72.52458 70.61460   68.00766   69.31113 69.39032   69.91261   69.65146 72.58609   72.75168   72.66888 70.85714         na         na       na   69.88203         na 74.47109   73.07963   73.77536 70.44855   71.28647   70.86751       na   72.33503         na 69.82818   70.45144   70.13981 68.66929   69.79866   69.23397 72.46879   71.50685   71.98782 71.11888   71.98336   71.55112       na   67.86667         na  imileft <- ((aslcomptest$lhml + aslcomptest$lrml)/(aslcomptest$lfml +                 aslcomptest$ltml)*100) imileft <- sapply(imileft, as.character) imileft[is.na(imileft)] <- ""

but when code, won't allow me average of "imileft" , "imiright" or make "imiavg" same other column has numerical value. 

imiavg<-((imileft + imiright)/2)

error in imileft + imiright : non-numeric argument binary operator

it same error if make as.numeric

try following. leave nas are

rowsums(m, na.rm=true) / 2 - (is.na(l) + is.na(r))  ## m = cbind(imileft,   imiright) l = imileft    r = imiright

if have rows both columns na, have denominator 

pmin(1, 2 - (is.na(l) + is.na(r)))

-

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