Cumulative standard deviation: Difference between revisions
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m (Added small COBOL example. Corrected PL/I and R lang tags.) |
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The implementation of this based of the standard's implementation: |
The implementation of this based of the standard's implementation: |
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<lang cobol>FUNCTION SQRT(FUNCTION VARIANCE(2, 4, 4, 4, 5, 5, 7, 9))</lang> |
<lang cobol>FUNCTION SQRT(FUNCTION VARIANCE(2, 4, 4, 4, 5, 5, 7, 9))</lang> |
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A complete implementation: |
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{{works with|OpenCOBOL|2.0}} |
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<lang cobol> >>SOURCE FREE |
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IDENTIFICATION DIVISION. |
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PROGRAM-ID. std-dev. |
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ENVIRONMENT DIVISION. |
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CONFIGURATION SECTION. |
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REPOSITORY. |
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FUNCTION sum-arr |
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. |
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DATA DIVISION. |
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WORKING-STORAGE SECTION. |
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78 Arr-Len VALUE 8. |
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01 arr-area VALUE "0204040405050709". |
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03 arr PIC 99 OCCURS Arr-Len TIMES. |
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01 i PIC 99. |
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01 avg PIC 9(3)V99. |
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01 std-dev PIC 9(3)V99. |
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PROCEDURE DIVISION. |
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DIVIDE FUNCTION sum-arr(arr-area) BY Arr-Len GIVING avg ROUNDED |
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PERFORM VARYING i FROM 1 BY 1 UNTIL i > Arr-Len |
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COMPUTE arr (i) = (arr (i) - avg) ** 2 |
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END-PERFORM |
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COMPUTE std-dev = FUNCTION SQRT(FUNCTION sum-arr(arr-area) / Arr-Len) |
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DISPLAY std-dev |
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. |
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END PROGRAM std-dev. |
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IDENTIFICATION DIVISION. |
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FUNCTION-ID. sum-arr. |
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DATA DIVISION. |
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LOCAL-STORAGE SECTION. |
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01 i PIC 99. |
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LINKAGE SECTION. |
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78 Arr-Len VALUE 8. |
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01 arr-area. |
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03 arr PIC 99 OCCURS Arr-Len TIMES. |
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01 arr-sum PIC 99. |
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PROCEDURE DIVISION USING arr-area RETURNING arr-sum. |
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INITIALIZE arr-sum *> Without this, arr-sum is initialised incorrectly. |
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PERFORM VARYING i FROM 1 BY 1 UNTIL i > Arr-Len |
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ADD arr (i) TO arr-sum |
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END-PERFORM |
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. |
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END FUNCTION sum-arr.</lang> |
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=={{header|CoffeeScript}}== |
=={{header|CoffeeScript}}== |
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