ChapterTolog

Tolog

Conversion from linear to logarithmic representation.

Loading LOADSUB ALL FROM "TOLOG.HTS"

or LOADSUB FROM "MATHLIB.HTS"

or LOADSUB Tolog FROM "MATHLIB.HTS"

Usage REAL A(*),B(*),X

CALL Tolog(A(*),X,B(*))

Description

Tolog converts the data in the array A into logarithmic representation and returns the results in the array B. The factor x is used to scale the data in the array A after it is converted; each point in A is multiplied by x after conversion is done. Tolog is usually used to convert data to decibel representation. Tolog is equivalent to the following BASIC lines

INTEGER I

FOR I=1 TO size(A)

B(I)=LOG(A(I))*X

NEXT I

where size(A) is the number of elements in the array A. In most cases, x is either 10 or 20.

Errors

Tolog causes an HTBasic error if its arguments are not all of type REAL or if A and B do not have the same number of elements.