diff --git a/doc/ChangeLog b/doc/ChangeLog index e509b12cd..f093646e6 100644 --- a/doc/ChangeLog +++ b/doc/ChangeLog @@ -1,7 +1,7 @@ -2000-05-21 Paolo Nenzi +2000-05-22 Paolo Nenzi + * ngspice.texi: Added text for u2 function and for resistance ac + paramter. - * ngspice.texi: documentation update. AC parameter for resistor - added. 1999-09-06 Arno Peters * ngspice.texi: Added TeX equivalents for some formula. diff --git a/doc/ngspice.texi b/doc/ngspice.texi index d6b81a31f..7727914f7 100644 --- a/doc/ngspice.texi +++ b/doc/ngspice.texi @@ -1803,10 +1803,13 @@ The function "u" is the unit step function, with a value of one for arguments greater than one and a value of zero for arguments less than zero. The function "uramp" is the integral of the unit step: for an input x, the value is zero if x is less than zero, or if x is greater -than zero the value is x. These two functions are useful in sythesizing -piece-wise non-linear functions, though convergence may be adversely -affected. +than zero the value is x. The function "u2" returns a value of zero for +arguments less than zero, one for arguments greater than one and assumes +the value of the argument between these limits .These three functions are +useful in sythesizing piece-wise non-linear functions, though convergence +may be adversely affected. +Note: "u2" function has been introduced in rework-11. The following standard operators are defined: