how to split an array by value

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My code so far is:

import numpy as np
data=np.genfromtxt('filename')
print(data)

which prints:

[[ 0.723  1.   ]
 [ 0.433  2.   ]
 [ 0.258  1.   ]
 [ 1.52   2.   ]
 [ 0.083  2.   ]
 [ 2.025  1.   ]
 [ 3.928  1.   ]]

How do i split the data into two groups, based on if the line has a 1 or 2?

A simple solution is to use np.where which returns results of a conditional statement in the form of a tuple of arrays, which can be directly used with numpy's advanced slice notation to slice that data into a new variable.

import numpy as np

data = np.array(
[[ 0.723,  1.   ],
 [ 0.433,  2.   ],
 [ 0.258,  1.   ],
 [ 1.52,   2.   ],
 [ 0.083,  2.   ],
 [ 2.025,  1.   ],
 [ 3.928,  1.   ]])

data1 = data[np.where(data[:,1] == 1)]
data2 = data[np.where(data[:,1] == 2)]

print(data1)
print(data2)

[ JavaScript ] Splice, Slice, Split | by Jean Pan, Splice, Slice, Split … they all start with S … Splice and Slice are almost twin … for me, sometimes it's hard slice() is a method of Array Object and String Object. Accessing an Object's Keys, Values, and Entries in JavaScript. The split() method is used to split a string into an array of substrings, and returns the new array. Tip: If an empty string ("") is used as the separator, the string is split between each character. Note: The split() method does not change the original string.

How about something like this:

import numpy as np

data = np.asarray([[0.723, 1.],
                   [0.433, 2.],
                   [0.258, 1.],
                   [1.520, 2.],
                   [0.083, 2.],
                   [2.025, 1.],
                   [3.928, 1.]])
split_data = [data[data[:,1] == 1.], data[data[:,1] == 2.]]
print(f'data:\n{data}')
print(f'split_data:\n{split_data}')

Explanation:

data[:,1] references the value in the 2nd "column" per se.

Output:

data:
[[0.723 1.   ]
 [0.433 2.   ]
 [0.258 1.   ]
 [1.52  2.   ]
 [0.083 2.   ]
 [2.025 1.   ]
 [3.928 1.   ]]
split_data:
[array([[0.723, 1.   ],
        [0.258, 1.   ],
        [2.025, 1.   ],
        [3.928, 1.   ]]), 
 array([[0.433, 2.   ],
        [1.52 , 2.   ],
        [0.083, 2.   ]])]

Split an array into chunks in JavaScript, Return value: Returns a new Array, having the selected items. Example-1:This example uses the slice() method to split the array into chunks of array. Excel VBA Split String into Array. A string is a collection of characters joined together, when these characters are divided and stored in a variable then that variable becomes an array for these characters and the method we use to split a string to make into an array is by using the SPLIT function in vba which splits the string in a one dimensional string.

Your question was rather brief, so I didn't quite catch the dataformat but I tried replicating it with:

foo = [[ 0.723,  1   ], [ 0.433,  2   ], [ 0.258,  1   ], [ 1.52,   2   ],
       [ 0.083,  2   ], [ 2.025,  1   ], [ 3.928,  1   ]]

In case would want to filter this list foo to only contain numbers matching certain number you could use the following list comprehension:

foo_is_1 = [e for e in foo if e[1] == 1]
foo_is_2 = [e for e in foo if e[1] == 2]
print(foo_is_1)
print(foo_is_2)

In case you know nothing about the second argument and just want to split your list up in a list of lists with unique second arguments you could use:

list_of_lists = [[e for e in foo if e[1] == a] for a in list(set([a[1] for a in foo]))]
for entry in list_of_lists:
    print(entry)

Which is basically two list comprehensions, one for each unique second argument a, and one for each entry e in foo.

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