I have mixed data set of both North (positive) and Negative latitude column and separate minutes column in data frame. I used simple Lat + (minutes/60) to convert this in to decimal degrees.
lat1 <- c(7, -7, 6, -0, -1, 6, 8, -7, 6, 6)
lat2 <- c(7.4, 55.7, 32.6, 8.9, 47.5, 25.6, 6.8, 45.7, 24.6, 7.6)
ifelse(lat1<0,(lat <- lat1-(lat2/60)),(lat <- lat1+(lat2/60)))
>[1] 7.1233333 -7.9283333 6.5433333 0.1483333 -1.7916667 6.4266667
[7] 8.1133333 -7.7616667 6.4100000 6.1266667
this result is correct but
> lat
[1] 7.1233333 -6.0716667 6.5433333 0.1483333 -0.2083333 6.4266667
[7] 8.1133333 -6.2383333 6.4100000 6.1266667
ifelse statement provide correct result in R console but not to stored it to vector "lat" I need to add minutes/60 to degree if degree value is positive and subtract minutes/60 from degrees if degree value is negative
The correct syntax to use ifelse here is the following:
lat <- ifelse(lat1 < 0, lat1 - lat2 / 60, lat1 + lat2 / 60)
ifelse returns a vector where component i = lat1[i] - lat2[i] / 60 if lat[i] < 0 and lat[1] + lat2[i] / 60 otherwise so you don't need to put the assignment inside.