[R] Iterating dates over multiple ids

Graeme Davidson gr@eme@r@d@v|d@on @end|ng |rom gm@||@com
Wed May 15 10:12:38 CEST 2019

Hi all, 

I want to create a df that repeats the dates over ids. Previously I tried expand.grid but this created every possible iteration of dates and ids, when all I want is the start and end dates repeated for each month. In other words 01/03/19 with an end date of 28/02/19 would be unsuitable. I have also been told that rbind may be unsuitable when the data is scaled up to tens of thousands of rows. I would appreciate any suggestions. 

#get list of month dates for last 6 months
end_months <- ymd("2018-11-01")+ months(0:6)-days(1)
start_months <- ymd("2018-10-01")+ months(0:6)

#list of view ids required to make api call (pseudonymised) viewId <- c(26494958, 477448251, 47843527, 96382507, 537821552, 67482819)
All the best

Graeme R Davidson PhD

Data and Insight Analyst 
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