sdevn
The sdevn function returns the standard deviation of a general lua table that may contain non-numeric values, named keys, and sub-tables. Only numeric values found in the table are used in the calculation. The related sdev function calculates the mean of a 1-dimensional array, CImage, or list of numbers. Since an array is a specific type of table that contains only numbers or sub-tables, this function can also be used for arrays.
nStdDev = sdevn( tbl )
tbl is a general lua table.
nStdDev is the standard deviation of the values.
The following script returns the standard deviation of a table containing 1 million random numbers.
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-- create a table of numbers |
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-- find the standard deviation |
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-- list the result |
The next example computes the standard deviation of an ugly, complex table:
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-- find the standard deviation |
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-- result: Sdev = 6.97615 using 4 values |
Table and Array Functions, sdevxn, meansdevn, sdev
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