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nushell/docs/commands/histogram.md
Waldir Pimenta 5ca9e12b7f
Fix whitespace and typos (#1481) 
* Remove EOL whitespace in files other than docs

* Break paragraphs into lines

See http://rhodesmill.org/brandon/2012/one-sentence-per-line/ for the rationale

* Fix various typos

* Remove EOL whitespace in docs/commands/*.md
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histogram

Creates a new table with a histogram based on the column name passed in.

Syntax: histogram <column_name> ...args

Parameters

  • <column-name>: name of the column to graph by
  • args: column name to give the histogram's frequency column

Examples

Let's say we have this file random_numers.csv which contains 50 random numbers.

Note: The input doesn't have to be numbers it works on strings too. Try it out.

> open random_numbers.csv
open random_numbers2.csv
━━━━┯━━━━━━━━━━━━━━━━
 #  │ random numbers
────┼────────────────
  0 │ 0
  1 │ 5
  2 │ 5
   ...
 47 │ 0
 48 │ 2
 49 │ 4
━━━━┷━━━━━━━━━━━━━━━━

If we now want to see how often the different numbers were generated, we can use the histogram function:

> open random_numbers2.csv | histogram "random numbers"
━━━┯━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
 # │ random numbers │ frequency
───┼────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────────
 0 │ 0              │ ****************************************************************************************************
 1 │ 1              │ ******************************
 2 │ 2              │ *************************************************************
 3 │ 3              │ *********************************************************************
 4 │ 4              │ *****************************************************
 5 │ 5              │ *********************************************************************
━━━┷━━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

We can also set the name of the second column or sort the table:

> open random_numbers2.csv | histogram "random numbers" probability
━━━┯━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
 # │ random numbers │ probability
───┼────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────────
 0 │ 0              │ ****************************************************************************************************
 1 │ 1              │ ******************************
 2 │ 2              │ *************************************************************
 3 │ 3              │ *********************************************************************
 4 │ 4              │ *****************************************************
 5 │ 5              │ *********************************************************************
━━━┷━━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━


> open random_numbers2.csv | histogram "random numbers" probability | sort-by probability
━━━┯━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
 # │ random numbers │ probability
───┼────────────────┼──────────────────────────────────────────────────────────────────────────────────────────────────────
 0 │ 1              │ ******************************
 1 │ 4              │ *****************************************************
 2 │ 2              │ *************************************************************
 3 │ 3              │ *********************************************************************
 4 │ 5              │ *********************************************************************
 5 │ 0              │ ****************************************************************************************************
━━━┷━━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━