CountIf Command

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CountIf[ <Condition>, <List> ]
Counts the number of elements in the list satisfying the condition.
Example:
  • CountIf[x < 3, {1, 2, 3, 4, 5}] gives you the number 2.
  • CountIf[x < 3, A1:A10], where A1:A10 is a range of cells in the spreadsheet, counts all cells whose values are less than 3.
Note: For list of numbers arbitrary condition may be used. For list of other objects one can use only conditions of the form x==constant or x!=constant.


CountIf[ <Condition>, <Variable>, <List> ]
As above, using a more flexible syntax.
Example:
Given points P, Q, R CountIf[x(A) < 3, A, {P, Q, R}] will count only the points whose x-coordinate is less than 3. The variable A is replaced in turn with P then Q then R for the check. Therefore CountIf[x(A) < 3, A, {(0, 1), (4, 2), (2, 2)}] yields the number 2.
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