How to get the most common class among elements

how to find the most frequent values in a list python
find most frequent element in an array java
python find most frequent string in list
find most frequent element in an array javascript
second most frequent element in an array
most frequently occurring digit in java
find most frequent element in an array python numpy
k most frequent elements python

How can I get the most common data type (i.e. class) among the elements of an array? For example, for this array:

array = [nil, "string", 1, 3, 0.234, 25, "hot potato"]

Integer should be returned since it's the most common class.

array.group_by(&:class).max_by{|k, v| v.length}.first
# => Integer

Find a most common class, who place similar elements in similar positions. elements, but they are not as useful for identifying relationships among elements that may have an unspecified This can be thought of as a search for “classes” or “types” of elements, much in​  Make use of Python Counter which returns count of each element in the list. Thus, we simply find the most common element by using most_common() method.

array.each_with_object(Hash.new(0)) { |e,h| h[e.class] += 1 }.
      max_by(&:last).
      first
        #=> Integer 

the first step being

array.each_with_object(Hash.new(0)) { |e,h| h[e.class] += 1 }
  #=> {NilClass=>1, String=>2, Integer=>3, Float=>1} 

Social Sequence Analysis: Methods and Applications, Make a set of the list so that the duplicate elements are deleted. Then find the highest count of occurrences of each element in the set and thus, we find the  most_common(n) Method Overview: most_common() returns a list of top 'n' elements from most common to least common, as specified the parameter 'n'. The list consists of tuples and each tuple contains the element and the element count . If the parameter 'n' is not specified or None is passed as the parameter most_common() returns a list of all

Following can also work,

array.inject(Hash.new(0)) { |h,v| h[v.class] += 1; h }.max_by(&:last).first

Python, If there are multiple elements that appear maximum number of times, print any one of them. Examples: Input : arr[] = {1, 3, 2, 1, 4, 1} Output : 1 1 appears three times  This chemical element with symbol S and atomic number 16 is the first in this list, and yet it is still in abundance. Iron. 9 – Iron (Abundance measured relative to silicon: 0.6) Its chemical element symbol is ‘Fe’ and it is atomic number 26. Common it might be, but it also helps that it forms much of Earth’s outer and inner core. Magnesium

Most frequent element in an array, Here we describe several common solid rocket propellants, their principal Composite propellants form a heterogeneous propellant grain between oxidizer four decades composites have been the most commonly used class of propellant. How to get distinct elements from an array by avoiding duplicate elements? Write a program to get distinct word list from the given file. Write a program to get a line with max word count from the given file. Write a program to convert string to number without using Integer.parseInt() method.

Rocket Propulsion Elements, known to him, he observed six or seven species to have six anthers, and the other two or three species to have only four, he placed the genus in the Sixth Class, among several species of the same genus, which of them was most common,  Molecules of most elements are made up of only one of atom of that element. Oxygen, along with nitrogen, hydrogen, and chlorine are made up of two atoms. Look at the model of oxygen above. The two balls represents the two oxygen molecules. The oxygen molecules are bonded or stuck together. We will learn about bonds later.

Elements of the Philosophy of Plants: Containing the Principles of , known to him , he observed six or seven species to have six ' anthers , and the other two or three species to have only four , he placed the genus in the Sixth Class among several species of the same genus , which of them was most common  Here are five elements of a strengths-based classroom environment. Positive asset-based relationships are visible among all in the classroom. Students have voice and choice in matters that pertain to them. Lessons are made relevant by connecting the curriculum to students’ lives.

Comments
  • By data type you mean the element's class?
  • @Stefan I believe so (I used data type just in case class meant something more specific that I wasn't aware of). Looks like class is what I meant (have edited question / title to reflect)
  • This will call count for each element, thus traversing the array multiple times.
  • If you are concerned with the speed, try with a much larger array (where the speed should actually matter in real life), for example array * 100000, and see what happens.
  • @ray but it has a default value of 0 so h[:z] = h[:z] + 1 becomes h[:z] = 0 + 1 on the first invocation.
  • You have to run each benchmark multiple times to get a meaningful result. Wrap each test in 50_000.times { ... } and see what happens. (inject and each_with_object should be almost identical and group_by should be slightly faster)
  • 'each_by_object' should be ...max_by(&:last), not ...max_by(). I suggest you add require 'benchmark'.