Model 4200A-SCS Parameter Analyzer Reference Manual
Section 13: LPT library function reference
4200A-901-01 Rev. C / February 2017
13-53
kfpexp
This command supplies the base of natural logarithms (e) raised to a specified power and stores the result as a
variable.
Usage
int kfpexp(double *
x
, double *
z
);
x
The exponent
z
The variable where the result of
e
x
is stored
Details
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).
Example
double res4, res4e;
.
.
measv(SMU1, &res4);/* Raise the base of natural */
/* logarithms e to the power */
/* res4; */
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
.
Also see
None
kfplog
This command returns the natural logarithm of a real number to the specified variable.
Usage
int kfplog(double *
x
, double *
z
);
x
A variable containing a floating point number
z
A variable where the result of ln (
x
) is stored
Details
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).
