python: Returning mininum in numpy.ndarray

Question

I have an array [test] of type numpy.ndarray:

[' -0.1 ' ' -0.4 ' ' -0.6 ' ' -0.2 ' ' -3.4 ' ' 0.0 ' ' -1.9 ' ' -1.2 ' ' -0.5 ']

and want to find the minimum value.

If I do print min(test) the value returned is -0.1 which is not the minimum (i.e. -3.4)

How do I correctly return the minimum value.

It looks like the values in your array are strings, not numbers. Take a look at test.dtype. — Warren Weckesser
– Warren Weckesser, Commented Aug 8, 2018 at 12:41
I'm pretty sure it's a list of strings too... the min gives -0.1 for strings and -3.4 for floats — smagnan
– smagnan, Commented Aug 8, 2018 at 12:42

John Zwinck · Accepted Answer · 2018-08-08 12:42:57Z

4

Convert first:

test.astype(float).min()

answered Aug 8, 2018 at 12:42

John Zwinck

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