How to adjust the time digits in this code?

Hello,

I wrote the following code to create a time vector between 13:45 and 14:15 with one minute step.

t1 = datetime(2016,5,4,13,45,0); 
t2 = datetime(2016,5,4,14,15,0); 
t = t1:minutes(1):t2; 
t = t'; 
[h,m] = hms(t); 
for i = 1:length(t) 
    if m(i) == 0 || 1 || 2 || 3 || 4 || 5 || 6 || 7 || 8 || 9 
        time_axis{i} = sprintf('%d:0%d',h(i),m(i)); 
    else 
        time_axis{i} = sprintf('%d:%d',h(i),m(i)); 
    end 
end 
clear i; 
time_axis = time_axis'; 

But the problem is that it adds a wrong zero in th minutes part like this.

'13:045'
'13:046'
'13:047'
.
.
'14:00'
'14:01'
'14:02'
'14:03'
.
.
'14:010'
'14:011'
.
.

How can I fix this?

Many thanks,

Mohamed

Answer 1

[fred ssemwogerere]

Hello, this should correct your problem. Where the comments are, is where i have made changes. The rest of your code remains the same

t1 = datetime(2016,5,4,13,45,0); 
t2 = datetime(2016,5,4,14,15,0); 
t = t1:minutes(1):t2; 
t = t'; 
[h,m] = hms(t); 
for i = 1:length(t) 
    if m(i) == 0 || 1 || 2 || 3 || 4 || 5 || 6 || 7 || 8 || 9 
        % specify the minimum width on both the hour and minute side as "2" but with a leading zero on the minute side 
        time_axis{i} = sprintf('%2d:%02d',h(i),m(i)); 
    else 
        % specify the minimum width on both the hour and minute side as "2", but with a leading zero on the minute side 
        time_axis{i} = sprintf('%2d:%02d',h(i),m(i)); 
    end 
end 
clear i; 
time_axis = time_axis'; 

[Mohamed Nedal]

Thank you very much, it works!

However, the other part of the if-condition should be like this though (without the zero) :)

    else 
        time_axis{i} = sprintf('%2d:%2d',h(i),m(i)); 
    end 

[Stephen23]

"The rest of your code remains the same"

Except for this, which is buggy:

m(i) == 0 || 1 || 2 || 3 || 4 || 5 || 6 || 7 || 8 || 9

What you wrote is equivalent to

(((...((m(i) == 0) || 1) || 2) .... || 8) || 9

which is equivalent to

(((...((m(i) == 0) || true) || true) ....true) || true

which is equivalent to

(m(i) == 0) || true) || true.... true || true

which is equivalent to

(m(i) == 0) || true

which is equivalent to

true

and I doubt that you will find that very useful.

Instead you could write something like this:

(m(i)==0) || (m(i)==1) || (m(i)==2) || ...
    

but I strongly recommend that you just use simpler ismember instead:

ismember(m(i),0:9)

[Mohamed Nedal]

ismember(m(i),0:9) 

That's even better and elegant. Thank you very much

[Mohamed Nedal]

One more question please.

If I have this

time_axis = ['13:45'
'13:46'
'13:47'
'13:48'
'13:49'
'13:50'
'13:51'
'13:52'
'13:53'
'13:54'
'13:55'
'13:56'
'13:57'
'13:58'
'13:59'
'14:00'
'14:01'
'14:02'
'14:03'
'14:04'
'14:05'
'14:06'
'14:07'
'14:08'
'14:09'
'14:10'
'14:11'
'14:12'
'14:13'
'14:14'
'14:15']; 
ax.XTick = [0,240,480,720,960,1200,1440,1680,1920,2160,2400,2640,2880,3120,3360,3600,...
    3840,4080,4320,4560,4800,5040,5280,5520,5760,6000,6240,6480,6720,6960,7200]; 
ax.XTickLabel = time_axis; 
t = [2842.6053
3185.8029
3464.6509
3722.0492
4143.8962
4508.5437
4894.6410
5409.4374
5816.9846
6145.8823]; 

How can I find at which time_axis (or XTickLabel) is t (in the format hh:mm:ss)?