Using find function in Matlab to find data at specific time

How can I use the find function in MATLAB in order to create a variable that includes data starting at time, t=0?

I have tried this:

N = find(Data(:)==0);

but I just get N equal to the number of data that are at t=0, not the actual data themselves.

[dpb]

Don't need find at all here...

zData=Data(Data==0);

"Logical Addressing"

Answer 1

[Jan]

index = find(Data >= 0, 1, 'first');
N     = Data(index:end)

[gps]

@Jan thank you for the help! i have a follow up question, is there a way of editing this for the case where my data have two columns, say x and t, rather than one and I just want my variable to contain only the data from column, starting from t=0 and onwards?

[Jan]

@gps:

index = find(Data(:, 2) >= 0, 1, 'first');
N     = Data(index:end, :)