Plot time data

I have time in a matrix and some data, how do I plot it..

a=['17:00';'17:30' ;'18:00'; '18:30' ;'19:00'];
b=[b=[2;4;5;3;1];

Error

plot(a,b)
Error using plot
Invalid first data argument

How can I plot it and show the time on Xaxis?

Answer 1

[Thomas]

You are getting an error because a is a string

You can use the following

c=datenum(a, 'HH:MM');  % convert date into a number to plot it
plot(c,b);              % plot the data,
hold on;
datetick('x','HH:MM')   % give the a xaxis time label ticks..