How to make a table of strings from a table of numerics

I want to apply convert_hour function to everyrow but it does some weird stuff that I don't understand

arr = [1;2;3;4];

T = array2table(arr);

convert_hour(T.arr)

function out = convert_hour(hour)

left = floor(hour/60);

right = floor(mod(hour, 60));

if left < 10; left = sprintf("0%d", left); else; left = sprintf("%d", left); end

if right < 10; right = sprintf("0%d", right); else; right = sprintf("%d", right); end

out = sprintf("%s:%s\n", left, right);

end

--------- the output is this

ans =

"00000000:01020304"

Answer 1

[Star Strider]

I’m not certain what you want, however substituting compose for sprintf may be appropriate —

arr = [1;2;3;4];
T = array2table(arr);
convert_hour(T.arr)

ans = 4×1 string array
    "00:01"
    "00:02"
    "00:03"
    "00:04"

function out = convert_hour(hour)
    left = floor(hour/60);
    right = floor(mod(hour, 60));
    if left < 10; left = compose("0%d", left); else; left = compose("%d", left); end
    if right < 10; right = compose("0%d", right); else; right = compose("%d", right); end
    out = compose("%s:%s", left, right);
end

.

[Cavit Ertugrul Sirt]

Thank you it works.

My professor gave us a table of hours in a year. (From 0 to 8760). This function converts those number to human readable hour string.

[Star Strider]

As always, my pleasure!

I appreciate the background information. That adds context.

[Steven Lord]

If this isn't homework, I'd just convert it to a duration.

numHours = randperm(8760, 10)

numHours = 1×10

4625 7125 2836 3691 4086 360 8208 1551 4714 66

d = hours(numHours)

d = 1×10 duration array
   4625 hr   7125 hr   2836 hr   3691 hr   4086 hr    360 hr   8208 hr   1551 hr   4714 hr     66 hr

d.Format = 'hh:mm'

d = 1×10 duration array
   4625:00   7125:00   2836:00   3691:00   4086:00    360:00   8208:00   1551:00   4714:00     66:00

or if you want to subtract off days and just give hours and minutes after midnight:

h = rem(d, hours(24))

h = 1×10 duration array
   17:00   21:00   04:00   19:00   06:00   00:00   00:00   15:00   10:00   18:00

[Cavit Ertugrul Sirt]

Thank you, but, can't I just make this into a function since I need to do this 3 times in my code.