I have a dataframe with coordinates (SWEREF_99, proj 3006) and realized that a lot of the coordinates have the wrong format.
For northern coordinates, they always have seven digits before a comma, and eastern coordinates have six digits before comma, then decimal digits. Like: 6789654.234 (north). However, my coordinates look like this; 6789654234. This means that I want to enter a comma/dot between digit 4 and 2.
I have tried formatC and format but when I use that I add multiple commas, such as 678.965.423.4 or just adds zeros after deciamal.
test <- format(data$North, 7, nsmall = 0)
Here´s a dataframe with imaginary coordinates, but it describes my data well.
data <- data.frame(North = c(678645345, 675836578, 6573645.786), East = c(354674.47, 37465434, 4263546))
As you can see, some of my coordinates look good, they have seven digits for north coordinates, and six digits for east coordinates. So these I don't want to change, but only the ones that do not include a comma.
Have anyone experience the same problem?
You can use regex to insert a decimal point at a particular position :
transform(data, North = sub('(.{7})\\.?(.*)', '\\1.\\2', North),
East = sub('(.{6})\\.?(.*)', '\\1.\\2', East))
# North East
#1 6786453.45 354674.47
#2 6758365.78 374654.34
#3 6573645.786 426354.6
We divide data in 2 capture groups.
The first capture group (.{7}) - captures first 7 characters
\\.? - an optional decimal place if present is ignored after that.
The second capture group ((.*)) is everything after that.
We return the two captures groups with backreference adding a "." between them ('\\1.\\2').
The same logic is applied for East column.