The time intervals in the two files don't coincide: in samples.txt I record my measures, then I have to search for the related time intervals of interest in time.txt.
For example, in samples.txt, measurements started at 903.0, then at 906.43 I got the first measure (2nd line). So, I have to go in time.txt and check if in the time period between 903 and 906.43 I was "in" or "out". Since I've been "in" all the time,itì's ok and I don't need to subtract anything.
The time instants preceding this interval are discarded.
Then, I go to the second measure in samples.txt (3rd line) and check if in time.txt if in the time interval between 906.43 and 912.7 I was "in" or "out". I've been "out" for 2 seconds, so I subtract this value from the time interval duration, and so on.
Time.txt records a very long time, usually with many seconds preceding and following the time instants in which measurements were taken. I refer to samples.txt, considering one sample at every iteration (i.e. the line referring to the current measure and the preceding one in order to get the time interval of interest), then I need to get the correspondent lines related to that time interval in time.txt. If the duration of "out" periods in this interval of interest is zero, it's ok and I don't need to subtract anything. In case it's non-zero, I need to subtract it from the interval duration
Hope is much clearer, thank a lot for your help anyway!
---------- Post updated at 05:11 AM ---------- Previous update was at 04:54 AM ----------
Hope this helps. Suppose you have
and
The result I need to get is
{18.4*(906.43-903.0-0)+17.5*(912.7-906.43-2)+11.2*(921.05-912.7-3)}/{(906.43-903.0-0)+(912.7-906.43-2)+(921.05-912.7-3)}
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Since I am posting on this board, yes, I am new to UNIX!
I read a copy of "UNIX made easy" from 1990, which felt like a making a "computer-science time jump" backwards ;)
So, basically I have some sort of understanding what the basic concept is.
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LEARN ABOUT FREEBSD
sleep
SLEEP(1) BSD General Commands Manual SLEEP(1)NAME
sleep -- suspend execution for an interval of time
SYNOPSIS
sleep seconds
DESCRIPTION
The sleep command suspends execution for a minimum of seconds.
If the sleep command receives a signal, it takes the standard action. When the SIGINFO signal is received, the estimate of the amount of
seconds left to sleep is printed on the standard output.
IMPLEMENTATION NOTES
The SIGALRM signal is not handled specially by this implementation.
The sleep command allows and honors a non-integer number of seconds to sleep in any form acceptable by strtod(3). This is a non-portable
extension, and its use will nearly guarantee that a shell script will not execute properly on another system.
EXIT STATUS
The sleep utility exits 0 on success, and >0 if an error occurs.
EXAMPLES
To schedule the execution of a command for x number seconds later (with csh(1)):
(sleep 1800; sh command_file >& errors)&
This incantation would wait a half hour before running the script command_file. (See the at(1) utility.)
To reiteratively run a command (with the csh(1)):
while (1)
if (! -r zzz.rawdata) then
sleep 300
else
foreach i (`ls *.rawdata`)
sleep 70
awk -f collapse_data $i >> results
end
break
endif
end
The scenario for a script such as this might be: a program currently running is taking longer than expected to process a series of files, and
it would be nice to have another program start processing the files created by the first program as soon as it is finished (when zzz.rawdata
is created). The script checks every five minutes for the file zzz.rawdata, when the file is found, then another portion processing is done
courteously by sleeping for 70 seconds in between each awk job.
SEE ALSO nanosleep(2), sleep(3)STANDARDS
The sleep command is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible.
HISTORY
A sleep command appeared in Version 4 AT&T UNIX.
BSD April 18, 1994 BSD