The Author Online Book Forums are Moving

The Author Online Book Forums will soon redirect to Manning's liveBook and liveVideo. All book forum content will migrate to liveBook's discussion forum and all video forum content will migrate to liveVideo. Log in to liveBook or liveVideo with your Manning credentials to join the discussion!

Thank you for your engagement in the AoF over the years! We look forward to offering you a more enhanced forum experience.

carminat (49) [Avatar] Offline
I would like to use the stats command on a file containing time data, but I get the error message:
"Stats command not available in timedata mode"

I agree that not all stats operations make sense in this case, and yet such a command would be indeed useful
(especially for the detection of invalid/incomplete/missing records)

I tried to force gnuplot to interpret the date as if it were a number using Unix time:
stats "2016c.csv" u (timecolumn(3,"%d/%m/%Y")) nooutput
but it did not work.

Is there a workaround?

PS: [a metaquestion regarding this forum] when I post a question/comment it often happens that it does not appear. I can retrieve it using the "back" browser button, so I usually re-post it a second time (and it always works). Is it just my problem?
philipp.janert (286) [Avatar] Offline
You should be able to use the stats command outside of timeseries mode, even if the data is, in fact, time series data. So:

set xdata
stats "file" u 1
set xdata time
plot "file" u 1:2

or whatever...

Limiting the stats command to a single column may be useful in this situation (but you are doing this already).

Regarding the meta-question: please let the publisher/maintainer know. There is a "feedback" button on the
login page - try that.
carminat (49) [Avatar] Offline
Thanks! Actually it works ...

And yet I am not completely satisfied: applying stats to time series is indeed useful to spot if there are missing data, but I would like gnuplot to translate time stamps into numbers (unix time), so that I can accomplish the following:
* spot malformed data;
* using stats with all its features.

One curious issue: if time stamps are in the form 31/12/2016, the command stats computes the average of the day field (giving a result like "Mean: 15.6236").

Another (probably related) issue is the following: is it possible to use the directive "smooth kdensity" for time series? I did not succeed so far...