plotting the following in matlab impossible?

I would like to plot time in the x axis vs data(Amplitude) on the y axis, moreover my time is in a cell and the data is in a double:;

Name, Size , Class

x= Rodtime , 238451x1, cell

Name , Size, Class

y= RPeakAmplitude1, 238451x1 , double

    Rodtime(1:9)

    ans =

    '12:00:08.172'
    '12:00:13.270'
    '12:00:15.668'
    '12:00:15.769'
    '12:00:24.749'
    '12:00:24.833'
    '12:00:25.293'
    '12:00:25.874'
    '12:00:27.000'
    ...

How could I plot this graph? thank you in advance Rod

Answer 1

[dpb]

dn=datenum(Rodtime); % convert to date num's
plot(dn,RPeakAmplitude1)
datetick('x')

Adjust x limits, tick spacing as desired. If you have late version of Matlab there's also a newer date/time class with some supposedly simpler methods altho I've not had the opportunity to try it...

[rfrg]

thank you so much for your time and reply, datetick does not seem work because I am not plotting serial date numbers in my implementation.

[Star Strider]

What are you plotting?

Specific Questions produce specific Answers.

[dpb]

Then, as shown, convert to datenums. If you want to use the Matlab time axes, that's what they're based on (either historic datetick or the newer time class is still a date number inside; just different methods).

[Walter Roberson]

You can specify the time format for datetick, such as

datetick('x', 'HH:MM')

[dpb]

but to be completely clear for the OP, the x-axis must be in datenumbers for it to be interpreted correctly.