Sorting a python array/recarray by column

by

Use data[np.argsort(data[:, 0])] where the 0 is the column index on which to sort:

In [27]: import numpy as np

In [28]: data = np.array([[5,2], [4,1], [3,6]])

In [29]: col = 0

In [30]: data=data[np.argsort(data[:,col])]
Out[30]: 
array([[3, 6],
       [4, 1],
       [5, 2]])

More Related Contents:

  1. Sorting arrays in NumPy by column
  2. Find elements of array one nearest to elements of array two
  3. Sort invariant for numpy.argsort with multiple dimensions
  4. Efficiently sorting a numpy array in descending order?
  5. argsort for a multidimensional ndarray
  6. Find the row indexes of several values in a numpy array
  7. What are the differences between numpy arrays and matrices? Which one should I use?
  8. Working with big data in python and numpy, not enough ram, how to save partial results on disc?
  9. How to apply a disc shaped mask to a NumPy array?
  10. How to remove specific elements in a numpy array
  11. Find nearest indices for one array against all values in another array – Python / NumPy
  12. Get the position of the largest value in a multi-dimensional NumPy array
  13. Convert a 1D array to a 2D array in numpy
  14. Using Numpy Vectorize on Functions that Return Vectors
  15. How to extend an array in-place in Numpy?
  16. np arrays being immutable – “assignment destination is read-only”
  17. Numpy individual element access slower than for lists
  18. How to turn a video into numpy array?
  19. Can numpy bincount work with 2D arrays?
  20. Numpy isnan() fails on an array of floats (from pandas dataframe apply)
  21. Concatenate range arrays given start, stop numbers in a vectorized way – NumPy
  22. Numpy – Replace a number with NaN
  23. Python: how to store a numpy multidimensional array in PyTables?
  24. numpy division with RuntimeWarning: invalid value encountered in double_scalars
  25. How does the axis parameter from NumPy work?
  26. Numpy Array Get row index searching by a row
  27. Resample a numpy array
  28. Creating a numpy array of 3D coordinates from three 1D arrays
  29. How to use Python multiprocessing Pool.map to fill numpy array in a for loop
  30. Is this the best way to add an extra dimension to a numpy array in one line of code?

Leave a Comment