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git-svn-id: svn://svn.icms.temple.edu/lammps-ro/trunk@8180 f3b2605a-c512-4ea7-a41b-209d697bcdaa

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sjplimp 2012-05-24 13:38:41 +00:00
parent d1419c4c9c
commit 2bf9d0be1f
2 changed files with 20 additions and 22 deletions
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21
doc/variable.html
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@ -443,12 +443,12 @@ will generate the sequence of output timesteps:
</P>
<PRE>1000,1100,1200, ... ,1900,2000
</PRE>
<P>The vdisplace(x,y) function takes 2 arguments: x = coord0 and y =
velocity, and uses the elapsed time to change the coordinate value by
a linear displacement due to the applied velocity over the course of a
run, according to this formula:
<P>The vdisplace(x,y) function takes 2 arguments: x = value0 and y =
velocity, and uses the elapsed time to change the value by a linear
displacement due to the applied velocity over the course of a run,
according to this formula:
</P>
<PRE>value = coord0 + velocity*(timestep-startstep)*dt
<PRE>value = value0 + velocity*(timestep-startstep)*dt
</PRE>
<P>where dt = the timestep size.
</P>
@ -459,13 +459,12 @@ the <I>start</I> keyword of the <A HREF = "run.html">run</A> command. See the
timestep-startstep.
</P>
<P>The swiggle(x,y,z) and cwiggle(x,y,z) functions each take 3 arguments:
x = coord0, y = amplitude, z = period. They use the elapsed time to
oscillate the coordinate value by a sin() or cos() function over the
course of a run, according to one of these formulas, where
omega = 2 PI / period:
x = value0, y = amplitude, z = period. They use the elapsed time to
oscillate the value by a sin() or cos() function over the course of a
run, according to one of these formulas, where omega = 2 PI / period:
</P>
<PRE>value = coord0 + Amplitude * sin(omega*(timestep-startstep)*dt)
value = coord0 + Amplitude * (1 - cos(omega*(timestep-startstep)*dt))
<PRE>value = value0 + Amplitude * sin(omega*(timestep-startstep)*dt)
value = value0 + Amplitude * (1 - cos(omega*(timestep-startstep)*dt))
</PRE>
<P>where dt = the timestep size.
</P>

21
doc/variable.txt
View File

@ -443,12 +443,12 @@ will generate the sequence of output timesteps:
1000,1100,1200, ... ,1900,2000 :pre
The vdisplace(x,y) function takes 2 arguments: x = coord0 and y =
velocity, and uses the elapsed time to change the coordinate value by
a linear displacement due to the applied velocity over the course of a
run, according to this formula:
The vdisplace(x,y) function takes 2 arguments: x = value0 and y =
velocity, and uses the elapsed time to change the value by a linear
displacement due to the applied velocity over the course of a run,
according to this formula:
value = coord0 + velocity*(timestep-startstep)*dt :pre
value = value0 + velocity*(timestep-startstep)*dt :pre
where dt = the timestep size.
@ -459,13 +459,12 @@ the {start} keyword of the "run"_run.html command. See the
timestep-startstep.
The swiggle(x,y,z) and cwiggle(x,y,z) functions each take 3 arguments:
x = coord0, y = amplitude, z = period. They use the elapsed time to
oscillate the coordinate value by a sin() or cos() function over the
course of a run, according to one of these formulas, where
omega = 2 PI / period:
x = value0, y = amplitude, z = period. They use the elapsed time to
oscillate the value by a sin() or cos() function over the course of a
run, according to one of these formulas, where omega = 2 PI / period:
value = coord0 + Amplitude * sin(omega*(timestep-startstep)*dt)
value = coord0 + Amplitude * (1 - cos(omega*(timestep-startstep)*dt)) :pre
value = value0 + Amplitude * sin(omega*(timestep-startstep)*dt)
value = value0 + Amplitude * (1 - cos(omega*(timestep-startstep)*dt)) :pre
where dt = the timestep size.