CODEWITHSUNDEEP
rwarnings
Herr Student
Herr Student

Reputation: 883

Create warnings in R

I wanna write a script whicht makes R usable for "everybody" at this special topic of analysis. Is there a possibility to create warnings?

time,value
2012-01-01,5
2012-01-02,0
2012-01-03,0
2012-01-04,0
2012-01-05,3

For example if the value is at least 3 times 0 (afterwards - better within a settet period of time - 3 days) give warnings - and naming the date. Maybe create something like a report, if I am combining conditions.

In general: Masurement data are read via read.csv and then set Date by as.POSIXct - xts/zoo. I want the "user" to get a clear message if the values are changing etc.; if they are 0 for a long time etc. The second step would be sending emails - maybe running on a server later.

Additional Questions: I do have a df in xts now - is it possible to check if the value is greater a threshold value? It's not working because it's not an atomic vector.

Thanks

Upvotes: 2

Views: 3771

Answers (1)

Roman Luštrik
Roman Luštrik

Reputation: 70603

Try this.

x <- read.table(text = "time,value
2012-01-01,5
2012-01-02,0
2012-01-03,0
2012-01-04,0
2012-01-05,3", header = TRUE, sep = ",")

if(any(rle(x$value)$lengths >= 3)) warning("I noticed some dates have value 0 at least three times.")

Warning message:
I noticed some dates have value 0 at least three times.

I'll leave it to you as a training exercise to paste a warning message that would also give you the date(s).

Upvotes: 7

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