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+--- Thread: Need help understanding simple Array code. Please. (/thread-17495.html)
Need help understanding simple Array code. Please. - stluwa - Apr-13-2019
import pandas
import numpy
dataframe = pandas.read_csv("C:\Users\stluwa\cars.csv")
array = dataframe.values
X = array[:,0:8]
Y = array[:,8]My problem is, I can not seem to figure out what is happening in the lines:X = array[:,0:8] Y = array[:,8]My biggest question is what the [:,0:8] means. I'm doing some feature selection stuff, but i never learned python.
RE: Need help understanding simple Array code. Please. - loomski - Apr-13-2019
(Apr-13-2019, 05:38 PM)stluwa Wrote:import pandas import numpy dataframe = pandas.read_csv("C:\Users\stluwa\cars.csv") array = dataframe.values X = array[:,0:8] Y = array[:,8]My problem is, I can not seem to figure out what is happening in the lines:
X = array[:,0:8] Y = array[:,8]My biggest question is what the [:,0:8] means. I'm doing some feature selection stuff, but i never learned python.
Hey, I'm not sure why it's [:,0:8] or [:,8] but it should instead be [:0:8] and [:8] respectively.
These are slices. You can read more about them here.
https://docs.python.org/3/tutorial/introduction.html#strings
https://docs.python.org/3/tutorial/introduction.html#lists