I have the following vector:
a = [10, 20, 30, 40, 50, 60...]
I need to create a new list that is subtracting the previous index from the previous one. For example:
b = [indice[0] - indice[1], indice[2] - indice[3], indice[4] - indice[5]...]
In this case, I have to answer the values:
b = [10, 10, 10...]
Could someone help me by saying how do I do this?
Thanks for the help.
Be to an array. Using list comprehension , we do:
a = [10, 20, 50, 80, 50, 60]
b = [a[i+1]-a[i] for i in range(0,len(a),2) if i+1 < len(a) ]
print b
In this way, we are only iterating the elements two by two.
See working here .
a = [10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120]
b = []
# i = indice anterior
i = 0
# p = proximo indice
p = 1
# Divide o tamanho total por 2
total = len(a) / 2
for x in xrange(0, len(a)):
if x < total:
b.append((a[p] - a[i]))
i += 2
p += 2
print(b)
Here's an example:
a = [10, 20, 50, 80, 50, 60];
b = [];
for i in range(len(a)):
if (i+1) < len(a):
b.append(a[i+1]-a[i]);
del(a[i])
print (b);