MATLAB: How to Repeat time data for a number of days

repeating data

Hi Guys, I have generated a column vector of one minutes interval time (So I have 1440 rows of time). Now I need repeat the times for 2490 days as I have 2490 trading days in my data set. So my output will be a column that contains 1440 time (from 12.00 AM to 11.59 PM) 2490 times. So total length of the column will be 1440*2490=3585600. Anyone can help plz?

Best Answer

Use repmat:

T = [1:1440]';                      % Column Vector Of Minutes
Days = 2490;                        % Days To Replicate
Tv = repmat(T, Days, 1);            % Time Vector (3585600x1)

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Most likely 1/1440 can not be represented exactly in binary, so every time you add it, you've got a small rounding error. These rounding errors accumulate to the point you loose a second after a while.

It's a fact that fractions can not be represented exactly by a computer (using double) so you should avoid summing small numbers. Note for example that:

s = 0
for i = 1:10, s = s + 0.1 end
s == 1

returns false due to the accumulation error after just 10 iterations.

What about using date vectors (or datetime) instead of datenum? They both use integer representation for hours, minutes and seconds.

Best Answer

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