Better use with gsub
On Aug 1, 2014, at 9:46 AM, Doran, Harold <HDoran at air.org> wrote:
I have done an embarrassingly bad job using a mixture of gsub and strsplit to solve a problem. Below is sample code showing what I have to start with (the vector xx) and I want to end up with two vectors x and y that contain only the digits found in xx.
Any regex users with advice most welcome
Harold
xx <- c("S24:57", "S24:86", "S24:119", "S24:129", "S24:138", "S24:163")
yy <- gsub("S","\\1", xx)
a1 <- gsub(":"," ", yy)
a2 <- sapply(a1, function(x) strsplit(x, ' '))
x <- as.numeric(sapply(a2, function(x) x[1]))
y <- as.numeric(sapply(a2, function(x) x[2]))
If a matrix is a satisfactory result, rather than two separate vectors:
sapply(strsplit(gsub("S", "", xx), xx, split = ":"), as.numeric)
[,1] [,2] [,3] [,4] [,5] [,6] [1,] 24 24 24 24 24 24 [2,] 57 86 119 129 138 163 Regards, Marc Schwartz