I'm trying to use the following statement:
if any(dy) < 0:
print 'do something'
I can see in the array that there a lots of elements < then 0 but still it seems like the program does can't read them and execute the print command. I suppose that is because dy is an array. How can I remedy this problem?
Use:
if any(i < 0 for i in dy):
print 'do something'
The i < 0 for i in dy part is a generator, which will yield some True values when iterated over if there are values less than 0 in dy. The any function then iterates over the generator, and returns True if it encounters any Trues in the generators output, meaning that there is a value(s) less than 0 in dy. In your current way, any will return True, which is equivalent to 1, or False, which is equivalent to 0, both of which are not less than 0, so your print is never executed.
any(dy) returns True (== 1) or False (== 0). That's never going to be smaller than 0.dy was all zeros, and any() returned False, it'd be equal, not smaller, to zero.
The any function simply tests if there is a single true value in the passed expression:
any(i < 0 for i in dy) # need to use a generator or list comprehension
any()is a built-in function that returns a True or False boolean value, and that value is never smaller than0. But given the fact that you use the termarrayhere makes me wonder if you are usingnumpy, which also comes with anany()function. Which one are you using?