hour to hour minute second conversion

I have an array represents hours, for example;

hour=[13.20,15.30,14.46,21];

Is there any matlab function to convert these hours to hour, minute, second? Example output;

hms=[13 12 0;15 18 0;14 27 36;21 0 0];

Answer 1

[Stephen23]

The basic concept is easy to implement:

tmp = hour(:);
H = fix(tmp);
tmp = 60*(tmp-H);
M = fix(tmp);
tmp = 60*(tmp-M);
S = tmp;
hms = [H,M,S]

However this can lead to accumulated floating point errors. One way to resolve this would be to perform some intermediate rounding like this:

adj = 1e12;
tmp = round(hour(:)*adj)/adj;
H = fix(tmp);
tmp = round(60*(tmp-H)*adj)/adj;
M = fix(tmp);
tmp = round(60*(tmp-M)*adj)/adj;
S = tmp;
hms = [H,M,S]

to give

 hms =
    13    12     0
    15    18     0
    14    27    36
    21     0     0

Answer 2

[Teja Muppirala]

There's a lot of really good new functionality for working with dates and times in recent versions.

myTimes=[13.20,15.30,14.46,21];

HR = hours(myTimes');
[H,M,S] = hms(HR);
HMS = [H M S]

This gives

HMS =

    13    12     0
    15    18     0
    14    27    36
    21     0     0