emax - 5 months ago 7x

Python Question

I have a list

`X`

`N`

`l1 = list()`

for i in range(0,N):

tmp = np.array(X[i])

tmp = tmp[tmp < tr]

tmp = np.histogram(tmp, x)

l1.append(tmp[0]/sum(tmp[0]))

Is there any way to avoid this loop?

Answer

Use `map`

:

```
def op(A):
tmp = np.array(A)
tmp = tmp[tmp < tr]
tmp = np.histogram(tmp, x)
return tmp[0]/sum(tmp[0])
# creates a generator
map(op, X)
# or, to get a list
l1 = list(map(op, X))
```

Source (Stackoverflow)

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