Kfpexp; Kfplog - Keithley 4200A-SCS Reference Manual

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Model 4200A-SCS Parameter Analyzer Reference Manual

kfpexp

This command supplies the base of natural logarithms (e) raised to a specified power and stores the result as a

int kfpexp(double *x, double *z);

e raised to the power of the value referenced by x is stored in the location pointed to by z. If an

overflow occurs, the result is ±Inf. If an underflow occurs, the result is zero (0).

double res4, res4e;

measv(SMU1, &res4);/* Raise the base of natural */

/* logarithms e to the power */

kfpexp(&res4, &res4e;/* return the result to res4e. */

In this example, kfpexp raises the base of natural logarithms to the power specified by the exponent

res4. The result is stored in res4e.

This command returns the natural logarithm of a real number to the specified variable.

int kfplog(double *x, double *z);

This command returns a natural logarithm, not a common logarithm. The natural logarithm of the

value referenced by x is stored in the location pointed to by z.

If a negative value or zero (0) is supplied for x, a log of negative value or zero (0) error is generated

and the result is NaN (not a number).

4200A-901-01 Rev. C / February 2017

The exponent

The variable where the result of e

A variable containing a floating point number

A variable where the result of ln (x) is stored

Section 13: LPT library function reference