gnucap:manual:howto:measure [*]

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Measurements

“Point” here refers to time, frequency, or whatever is the independent “x” value.

at	The value of a wave at a point, or its derivative.
average mean	Average or mean value.
cross	Find crossings.
integrate area	The area under the curve.
max	Maximum value, or its point.
min	Minimum value, or its point.
rms	The RMS value.
slewrate slope ddt	Slew rate or slope.