Keithley 4200-SCS Reference Manual page 427

Model 4200-SCS Reference Manual
LINFITSLP: Formulator function
Purpose
Format
Example
Remarks
LINFITXINT: Formulator function
Purpose
Format
Example
Remarks
4200-901-01 Rev. S / May 2017
Performs the following:
• 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).
LINFITSLP(VX, VY, STARTPOS, ENDPOS)
Where: 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.
RESISTANCE = 1/LINFITSLP(rESV, RESI, FIRSTPOS(rESV),
LASTPOS(rESV))
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.
Performs the following:
• 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 X intercept of the linear equation (value of -a/b in Y = a + bX).
LINFITXINT(VX, VY, STARTPOS, ENDPOS)
Where: 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.
EARLYV = LINFITXINT(COLLECTORV, COLLECTORI, 56, 75)
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 X intercept of a linear regression fit for two columns (vectors), use the
REGFITXINT function.
Return to Section Topics
Section 6: Keithley Interactive Test Environment (KITE)
6-301