Add data tips at specific date time

I am trying to add datatips at a specific time in my data

a is datetime

b is temperature

I would like to add datatip on b at nearest YYYY-MM-DD HH:MM using datatip().

Thanks in advance.

Answer 1

[Les Beckham]

It's always useful to provide some sample data for questions like this. I'll make up some data for now.

Hopefully this example will help will show you what to do to get what you want with your actual data.

a = datetime('now') + duration(0, [0:120], 0, 0); % Make up some test data
b = linspace(0, 10, numel(a)) + rand(1, numel(a));
hl = plot(a,b);
grid on
xlabel 'Time'
ylabel 'Temperature'
% pick a time point an hour from now for testing - replace with your
% desired time
desired_time =  datetime('now') + hours(1); 

temp_at_desired_time = b(find(a>desired_time, 1));
datatip(hl, desired_time, temp_at_desired_time);

●

[Walter Roberson]

temp_at_desired_time = b(find(a>desired_time, 1));

There is another way to achieve this, that is slightly longer but is good in the case of finding the right location for several times

temp_at_desired_time = interp1(a, b, desired_time, 'previous');