CStats:Stats

CStats:Stats

The Stats method computes the mean, standard deviation, and other basic statistics for numeric data and returns them in an indexed table.

tbl = CStats:Stats( CImage, CRect )

tbl = CStats:Stats( CImage )

tbl = CStats:Stats( CArray )

tbl = CStats:Stats( table )

CRect is a bounding rectangle for the CImage object.

CArray is a CArray object.

tbl is a 1-dimensional array containing numbers.

The returned value tbl is an indexed table containing the following 8 values:

tbl[1] is the mean value returned in table index 1.

tbl[2] is the median value returned in table index 2.

tbl[3] is the standard deviation returned in table index 3.

tbl[4] is the minimum value returned in table index 4.

tbl[5] is the maximum value returned in table index 5.

tbl[6] is the statistical skewness returned in table index 6.

tbl[7] is the statistical kurtosis returned in table index 7.

tbl[8] is the number of values in the sample returned in table index 8.

On success, tbl is returned.

On failure, returns nil.

Suppose a CImage I exists. The following script returns the mean and standard deviation of 600 pixels in the corner of the image:

S = new_stats()	-- create a CStats object
t = S:Stats( I, new_rect( 10,30,15,35 )	-- computes values inside the CRect
Printf("mean=%lg +/- %lg\n", t[1], t[3] )	-- list the result
S:delete()	-- when done with S, delete it