Re: [R] Creating data using multiple for loops

Perhaps different people find different concepts the most challenging, but I find looking at the output of expand.grid quite informative... do try it out. The do.call function seems to be the more obscure function here, but Bert's code id <- do.call( paste0, expand.grid(0:9,1:3,1:5) ) is equiva

Re: [R] Creating data using multiple for loops

>From section 9.2.2 (on looping) in "An Introduction to R": "*Warning*: for() loops are used in R code much less often than in compiled languages. Code that takes a ‘whole object’ view is likely to be both clearer and faster in R." Web searching on "for loops in R" and similar will give you furth

Re: [R] Creating data using multiple for loops

Hi Greg, I replied because I thought the name of the "expand.grid" function can be puzzling. While "expand.grid" is a very elegant and useful function, it is much easier to see what is happening with explicit loops rather than loops buried deep inside "expand.grid". Also note Bill's comment about p

Re: [R] Creating data using multiple for loops

do.call(paste0,expand.grid(0:1000, 1:12, 1:30)) takes care of storing all the values, but note that paste() doesn't put leading zeroes in front of small numbers so this maps lots of ssn/month/day combos to the the same id. sprintf() can take care of that: id <- with(expand.grid(ssn=0:1000, month=

Re: [R] Creating data using multiple for loops

Hi Greg, One problem is that you have misplaced the closing brace in the third loop. It should follow the assignment statement. Because you used loops rather than Bert's suggestion, perhaps you are trying to order the values assigned. In your example, the ordering will be ssn, then month of birth,

Re: [R] Creating data using multiple for loops

id <- do.call(paste0,expand.grid(0:9, 1:3, 1:5)) Comment: If you use R much, you'll do much better using R language constructs than trying to apply those from other languages (Java perhaps?). I realize this can be difficult, especially if you are experienced in the another language (or languages),

[R] Creating data using multiple for loops

I would like to create pseudo identification numbers in the format of last four of a social security number ( to ), month of birth (01 to 12), and day of birth (01-28). The IDs can be character. I have gotten this far: for (ssn in 0:9){ for (month in 1:3){ for (day in 1:5){