Whether there is a bool style variable in lammps?

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1

Dear all,

Recently I met a problem when I tried to reset some environment settings during a single run. The input file is presented below.
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run 10000 #for test
write_data Si.data
write_restart Restart.Si
variable myTemp equal temp
if “{myTemp} > 400" then & "variable bottem_top equal Bound(top,zmin)" & "fix wall middle all/reflect zhi v_bottem_top" & "variable ts equal timestep" & "print 'timestep {ts}’” &
“run 300000” &
“write_data Si_stretch.data” &
“write_restart Si_stretch.restart” &
“quit”
run 350000
write_data Si_stretch.data
write_restart Restart.Si_stretch

I want to execute the IF command for only once. The original idea came up to me is to set the command as ‘if "${myTemp} > 400 && once’" and change the numeric value of the once when the if command executed. But iI cannot find a suitable style variable to do this. So I am wondering if there is a suitable variable style to do this job?
Then i set the input file just as above, however, a new error came up with “Compute used in variable thermo keyword between runs is not current”, it seems that it is not allowed to reference to a thermo keyword in a new run while the old run has not yet finished. Is there any way to refer to it?

Regards,
Xiaoneng

2

Not fully clear what you are asking, but the top of the variable doc page explains
there are some variable styles where you cannot re-define their value, but others
where you can. So if you use the correct style you can re-define the variable once
to be 0 instead of 1 in the body of your if command. This has nothing to do
with thermo keywords that you mention.

Steve