CStats:Sdev

The Sdev method computes the standard deviation of a data sample. The parameters must contain numbers or strings that can be converted to numbers.

Syntax

nSdev = CStats:Sdev( CImage, CRect )

nSdev = CStats:Sdev( CImage )

nSdev = CStats:Sdev( table )

nSdev = CStats:Sdev( n1,n2, n3, ... )

CRect is a bounding rectangle for the CImage objec.

table is a 1-dimensional array containing numbers.

n1, n2, n3, ... are numbers or string values that can be converted to numbers.

On success, returns the standard deviation.

On failure, returns 0.

Example

Suppose a CImage I and a CRect R exist. The following script returns the standard deviation relative to the simple arithmetic mean value inside a rectangle on the image:

S = new_stats()	-- create a CStats object
-- specify CImage and CRect to measure
nSdev = S:Sdev(I, R)	-- return the standard deviation
Printf("Sdev=%lg\n", nSdev)	-- list the results
S:delete()	-- when done with S, remove it from memory

Syntax

Example

Related Topics