[python] How to count the occurrence of certain item in an ndarray?

if you are dealing with very large arrays using generators could be an option. The nice thing here it that this approach works fine for both arrays and lists and you dont need any additional package. Additionally, you are not using that much memory.

my_array = np.array([0, 0, 0, 1, 0, 1, 1, 0, 0, 0, 0, 1])
sum(1 for val in my_array if val==0)
Out: 8

Examples related to python

programming a servo thru a barometer Is there a way to view two blocks of code from the same file simultaneously in Sublime Text? python variable NameError Why my regexp for hyphenated words doesn't work? Comparing a variable with a string python not working when redirecting from bash script is it possible to add colors to python output? Get Public URL for File - Google Cloud Storage - App Engine (Python) Real time face detection OpenCV, Python xlrd.biffh.XLRDError: Excel xlsx file; not supported Could not load dynamic library 'cudart64_101.dll' on tensorflow CPU-only installation

Examples related to numpy

Unable to allocate array with shape and data type How to fix 'Object arrays cannot be loaded when allow_pickle=False' for imdb.load_data() function? Numpy, multiply array with scalar TypeError: only integer scalar arrays can be converted to a scalar index with 1D numpy indices array Could not install packages due to a "Environment error :[error 13]: permission denied : 'usr/local/bin/f2py'" Pytorch tensor to numpy array Numpy Resize/Rescale Image what does numpy ndarray shape do? How to round a numpy array? numpy array TypeError: only integer scalar arrays can be converted to a scalar index

Examples related to multidimensional-array

what does numpy ndarray shape do? len() of a numpy array in python What is the purpose of meshgrid in Python / NumPy? Convert a numpy.ndarray to string(or bytes) and convert it back to numpy.ndarray Typescript - multidimensional array initialization How to get every first element in 2 dimensional list How does numpy.newaxis work and when to use it? How to count the occurrence of certain item in an ndarray? Iterate through 2 dimensional array Selecting specific rows and columns from NumPy array

Examples related to count

Count the Number of Tables in a SQL Server Database SQL count rows in a table How to count the occurrence of certain item in an ndarray? Laravel Eloquent - distinct() and count() not working properly together How to count items in JSON data Powershell: count members of a AD group How to count how many values per level in a given factor? Count number of rows by group using dplyr C++ - how to find the length of an integer JPA COUNT with composite primary key query not working