Keithley 4200A-SCS, Reference Manual

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Model 4200A-SCS Parameter Analyzer Reference Manual Section 6: Clarius
4200A-901-01 Rev. C / February 2017 6-251
LINFITSLP Formulator function
Finds a linear equation and returns the slope.
Usage
LINFITSLP( VX , VY , STARTPOS , ENDPOS )
VX The name of any column (vector) listed under Columns
VY The name of any column (vector) listed under Columns
STARTPOS
The row number (index) of the first set of
X
and
Y
values
ENDPOS
The row number (index) of the second set of
X
and
Y
values
Details
Finds a linear equation and returns the slope as follows:
•
Finds a linear equation of the form
Y = a + bX
from two sets of
X
and
Y
values selected from
two columns (vectors),
VX
and
VY
. This equation corresponds to a line drawn through two points
on a curve that is created by plotting the values in
VY
against the values in
VX
. The two points are
specified by the arguments
STARTPOS
and
ENDPOS
.
•
Returns the slope of the linear equation (value of
b
in
Y = a + bX
).
If a
VX
or
VY
value at either
STARTPOS
or
ENDPOS
is an invalid number (that is, the value is
#REF
),
the function will not return a valid result.
To return the slope of a linear regression fit for two columns (vectors), use the
REGFITSLP
function.
Example
RESISTANCE = 1/LINFITSLP(rESV, RESI, FIRSTPOS(rESV), LASTPOS(rESV))
Also see
REGFITSLP (on page 6-261)