<randum number generation
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Hei, I have a time series for day and observation for a period of 365 days in variable a, a(:,1) being the daynumber (1 - 365) and a(:,2) the observations. I need to randomly select a day every week, so the first selection has to be a number from 1 - 7, the second day has to be a number between 8 - 14, etc. The selected daynumber have to be entered in a new variable (b). How is this done? Thanks for helping, Johannes.
Niklas Nylén on 18 Mar 2014
If we assume that the first day in the array also is the start of a week it is necessary to generate 52 random days during a 365 day period. Since 52*7 = 364 it the final day must be day 365 since it is the only day in that week.
Start of by generating 52 random integers in the range [1,7].
randomWeekdays = randi(7,1,52);
Next, translate the numbers to days in the year
b = randomWeekdays+(0:7:358);