Keithley 4200-SCS Reference Manual page 1671

Model 4200-SCS Reference Manual
wlrlib user library reference
The user modules in the wlrlib user library are used to perform linear regression and QBD ramp
tests for WLR testing. These user modules are summarized in
user modules follow the table.
Table N-2
WLR user modules
User module
llsq1
qbd_rmpv
qbd_rmpj
llsq1 user module
User module description
The llsq1 routine performs simple linear regression. This user module is not intended to be used
as a stand-alone module. It is a function that is used by other modules. The llsq1 user module is
shown in
NOTE:
NOTE:
CAUTION
Syntax:
status = llsq1(double *x, double *y, int start_index, int npts, double *a, double *b, double *r);
Figure N-7
llsq1 user module
4200-901-01 Rev. S / May 2017
Figure N-7.
Reference: See page 175 of Snedecor, "Statistical Methods."
LLSQ will return 0.0 for a, b, and r if the slope correlation calculations have 0.0
denominators.
Occasionally, it may be necessary to modify this routine. If this is done, be
sure to change the name of the function. Other routines may be relying on this
function. If the name is not changed, it will be overwritten in your next update.
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Description
Performs simple linear regression.
Performs Charge-to-Breakdown test using the
QBD V-ramp test.
Performs Charge-to-Breakdown test using the
QBD J-ramp test.
Appendix N: Additional User Libraries
Table N-2. Details for each of the
N-11