git-svn-id: svn://svn.icms.temple.edu/lammps-ro/trunk@197 f3b2605a-c512-4ea7-a41b-209d697bcdaa

doc/dump.html

@@ -156,13 +156,10 @@ initial snapshot from an XYZ formatted file to get started.
 </P>
 <HR>
 
-<P>Dumps are performed on timesteps that are a multiple of N and on the
-first step of a run or minimization, excluding duplicate timesteps.  A
-dump is not performed on the last timestep of a run unless it is a
-multiple of N.  A dump is performed on the last timestep of a
-minimization if the minimization converges.  N can be changed between
-runs by using the <A HREF = "dump_modify.html">dump_modify</A> command (not allowed
-for <I>dcd</I> style).
+<P>Dumps are performed on timesteps that are a multiple of N (including
+timestep 0) and on the last timestep of a minimization if the
+minimization converges.  N can be changed between runs by using the
+<A HREF = "dump_modify.html">dump_modify</A> command (not allowed for <I>dcd</I> style).
 </P>
 <P>The specified filename determines how the dump file(s) is written.
 The default is to write one large text file, which is opened when the

doc/dump.txt

@@ -146,13 +146,10 @@ initial snapshot from an XYZ formatted file to get started.
 
 :line
 
-Dumps are performed on timesteps that are a multiple of N and on the
-first step of a run or minimization, excluding duplicate timesteps.  A
-dump is not performed on the last timestep of a run unless it is a
-multiple of N.  A dump is performed on the last timestep of a
-minimization if the minimization converges.  N can be changed between
-runs by using the "dump_modify"_dump_modify.html command (not allowed
-for {dcd} style).
+Dumps are performed on timesteps that are a multiple of N (including
+timestep 0) and on the last timestep of a minimization if the
+minimization converges.  N can be changed between runs by using the
+"dump_modify"_dump_modify.html command (not allowed for {dcd} style).
 
 The specified filename determines how the dump file(s) is written.
 The default is to write one large text file, which is opened when the

doc/fix.html

@@ -45,10 +45,6 @@ setforce</A> page for information on style <I>setforce</I>.
 If 2 or more fixes both operate at the same stage of the timestep,
 they are invoked in the order they were specified in the input script.
 </P>
-<P>Specifying a new fix with the same ID as an existing fix effectively
-replaces the old fix (and its parameters) with the new fix.  This can
-only be done if the new fix has the same style as the existing fix.
-</P>
 <P>Fixes can be deleted with the <A HREF = "unfix.html">unfix</A> command.  Note that
 this is the only way to turn off a fix; simply specifying a new fix
 with a similar style will not turn off the first one.  For example,
@@ -57,6 +53,14 @@ command for the first run, will not cancel out the NVT time
 integration invoked by the "fix nvt" command.  Thus two time
 integrators would be in place!
 </P>
+<P>If you specify a new fix with the same ID and style as an existing
+fix, the old fix is deleted and the new one is created (presumably
+with new settings).  This is the same as if an "unfix" command were
+first performed on the old fix, except that the new fix is kept in the
+same order relative to the existing fixes as the old one originally
+was.  Note that this operation also wipes out any additional changes
+made to the old fix via the <A HREF = "fix_modify.html">fix_modify</A> command.
+</P>
 <P>Here is an alphabetic list of fix styles defined in LAMMPS:
 </P>
 <UL><LI><A HREF = "fix_addforce.html">fix addforce</A> - add a force to each atom

doc/fix.txt

@@ -42,10 +42,6 @@ Fixes perform their operations at different stages of the timestep.
 If 2 or more fixes both operate at the same stage of the timestep,
 they are invoked in the order they were specified in the input script.
 
-Specifying a new fix with the same ID as an existing fix effectively
-replaces the old fix (and its parameters) with the new fix.  This can
-only be done if the new fix has the same style as the existing fix.
-
 Fixes can be deleted with the "unfix"_unfix.html command.  Note that
 this is the only way to turn off a fix; simply specifying a new fix
 with a similar style will not turn off the first one.  For example,
@@ -54,6 +50,14 @@ command for the first run, will not cancel out the NVT time
 integration invoked by the "fix nvt" command.  Thus two time
 integrators would be in place!
 
+If you specify a new fix with the same ID and style as an existing
+fix, the old fix is deleted and the new one is created (presumably
+with new settings).  This is the same as if an "unfix" command were
+first performed on the old fix, except that the new fix is kept in the
+same order relative to the existing fixes as the old one originally
+was.  Note that this operation also wipes out any additional changes
+made to the old fix via the "fix_modify"_fix_modify.html command.
+
 Here is an alphabetic list of fix styles defined in LAMMPS:
 
 "fix addforce"_fix_addforce.html - add a force to each atom

doc/unfix.html

@@ -24,8 +24,9 @@ unfix lower-boundary
 </PRE>
 <P><B>Description:</B>
 </P>
-<P>Turn off a fix that was previously defined with a <A HREF = "fix.html">fix</A>
-command.
+<P>Delete a fix that was previously defined with a <A HREF = "fix.html">fix</A>
+command.  This also wipes out any additional changes made to the fix
+via the <A HREF = "fix_modify.html">fix_modify</A> command.
 </P>
 <P><B>Restrictions:</B> none
 </P>

doc/unfix.txt

@@ -21,8 +21,9 @@ unfix lower-boundary :pre
 
 [Description:]
 
-Turn off a fix that was previously defined with a "fix"_fix.html
-command.
+Delete a fix that was previously defined with a "fix"_fix.html
+command.  This also wipes out any additional changes made to the fix
+via the "fix_modify"_fix_modify.html command.
 
 [Restrictions:] none