[R] Loop to check for large dataset
petr.pikal at precheza.cz
Mon Oct 10 11:00:39 CEST 2016
I named your data test
res <- xtabs(~STORE+WEEK+Description, data=test)
should give you values in which there is for given Description WEEK and STORE missing.
you can select week and store by
which(res[, ,1]==0, arr.ind=T)
for description 1 and so on.
Another option is to generate full set STORE, WEEK and description and merge it with original data by merge.
From: Christoph Puschmann [mailto:c.puschmann at student.unsw.edu.au]
Sent: Monday, October 10, 2016 9:34 AM
To: PIKAL Petr <petr.pikal at precheza.cz>; r-help at r-project.org
Subject: Re: [R] Loop to check for large dataset
I attached a sample file, which contains the first 4 products.
It is more that I have: 157 weeks, 19 different Stores and 22 products: 157*19*22 = 65,626 rows. And as I sated I have roughly 63,127 rows. (so some have to be missing).
All the best,
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