I have a set of data which needs to be grouped on the basis of the dates. Further calculations needs to be done like calculation of RV, BPV etc on a daily basis.
I tried using the code newStr = extractBefore(str,11) to extract only the dates and then try the grouping. However, since ' is present in the string, the code is not able to extract the date ('08-Jan-2015 01:33:28').
Can someone help me group this data on the basis of dates and perform further operations.
In reference to final_use variable in workspace-
The first column in the attached .mat file are the dates and time(in unix format) and the second column are the prices. I have calculated the returns and is in the third column.
This further converts the unix time into character array.
function dn = unixtime_to_datenum( unix_time )
dn = unix_time/86400 + 719529;
time = final_use(:,1)
str = datestr( unixtime_to_datenum( time ) )