[Tutor] using datetime and calculating hourly average

[Alan Gauld]

"John [H2O]" <washakie at gmail.com> wrote 

> --> 196         ind = np.where( (t1 < Y[:,0] < t2) ) #same result
> 
> TypeError: can't compare datetime.datetime to numpy.ndarray

Have you checked what you are comparing?
Try printing Y[:,0]
It looks like an invalid test and no amolunt of parenthesising 
or 'and'ing will make it work.

> --> 196         ind = np.where( (Y[:,0]>t1) and (Y[:,0]<t2) )
> 
> ValueError: The truth value of an array with more than one element is
> ambiguous. Use a.any() or a.all()

Looks like the Y[:,0] value is not compatible with the time t1 or t2.

What does 

print Y[:,0] 

produce?


-- 
Alan Gauld
Author of the Learn to Program web site
http://www.alan-g.me.uk/