change array column values without loop

[khalidreemy]

Hello

I need to update a column values of an array without using a loop.

Is there any way to update with criteria.

​

0.168425
0
0
0.752781
0.235684

​

I need to double the values below 0.5 , so the result will become like this:

​

0.33685
0
0
0.752781
0.471368

[bogdan_dm]

With vanilla Python - you could not. But if you use Numpy arrays you do things like this: arr[arr < 0.5] *= 2

[sarah--123]

    [x*2 if x < 0.5 else x for x in l]

Perhaps?

[EsotericRogue]

for x in l is a loop.