MATLAB: How to encompass a half-hour block of time

Financial ToolboxMATLABOptimization ToolboxStatistics and Machine Learning Toolboxtime series

The code below finds the index of every timestamp at 3:30.
timeStr=cellstr(datestr(time));
timeDbl=datevec(timeStr);
times=and(timeDbl(:,4)==14,timeDbl(:,5)==30);
priceIdx=find(times);
How can I encompass/index a half hour block of time? This is what I'm trying to do.
times=and(timeDbl(:,4)==14,timeDbl(:,5)==30:59);
Any suggestions?

Best Answer

As per my understanding, you wish to retrieve indices corresponding to values within a half hour interval, from a matrix which has date vectors as rows. This can be done using the "find" function, "&" logical operator, and the "and" function in a single command such as:
>> priceIdx=find(timeDbl(:,4)==9 & and(timeDbl(:,5)>30,timeDbl(:,5)<59 )) % interval of (9:30, 9:59)

I was able to retrieve row numbers containing values within the interval I specified. For example,
>> timeDbl =
          2015           7          23           9          36          35
          2015           7          23           9          28          39
          2015           7          23          11          58          20
          2015           7          23           9          56          20
>> priceIdx=find(timeDbl(:,4)==9 & and(timeDbl(:,5)>30,timeDbl(:,5)<59 ))  % interval of (9:30, 9:59)
priceIdx =
       1
       4
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