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< title > print command — LAMMPS documentation< / title >
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< div class = "section" id = "print-command" >
< span id = "index-0" > < / span > < h1 > print command< a class = "headerlink" href = "#print-command" title = "Permalink to this headline" > ¶< / a > < / h1 >
< div class = "section" id = "syntax" >
< h2 > Syntax< a class = "headerlink" href = "#syntax" title = "Permalink to this headline" > ¶< / a > < / h2 >
< div class = "highlight-python" > < div class = "highlight" > < pre > print string keyword value
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< li > string = text string to print, which may contain variables< / li >
< li > zero or more keyword/value pairs may be appended< / li >
< li > keyword = < em > file< / em > or < em > append< / em > or < em > screen< / em > < / li >
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< pre class = "literal-block" >
< em > file< / em > value = filename
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< em > append< / em > value = filename
< em > screen< / em > value = < em > yes< / em > or < em > no< / em >
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< / pre >
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< div class = "section" id = "examples" >
< h2 > Examples< a class = "headerlink" href = "#examples" title = "Permalink to this headline" > ¶< / a > < / h2 >
< div class = "highlight-python" > < div class = "highlight" > < pre > print " Done with equilibration" file info.dat
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print Vol=$v append info.dat screen no
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print " The system volume is now $v"
print ' The system volume is now $v'
print " " "
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System volume = $v
System temperature = $t
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" " "
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< div class = "section" id = "description" >
< h2 > Description< a class = "headerlink" href = "#description" title = "Permalink to this headline" > ¶< / a > < / h2 >
< p > Print a text string to the screen and logfile. The text string must
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be a single argument, so if it is one line but more than one word, it
should be enclosed in single or double quotes. To generate multiple
lines of output, the string can be enclosed in triple quotes, as in
the last example above. If the text string contains variables, they
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will be evaluated and their current values printed.< / p >
< p > If the < em > file< / em > or < em > append< / em > keyword is used, a filename is specified to
which the output will be written. If < em > file< / em > is used, then the
filename is overwritten if it already exists. If < em > append< / em > is used,
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then the filename is appended to if it already exists, or created if
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it does not exist.< / p >
< p > If the < em > screen< / em > keyword is used, output to the screen and logfile can
be turned on or off as desired.< / p >
< p > If you want the print command to be executed multiple times (with
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changing variable values), there are 3 options. First, consider using
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the < a class = "reference internal" href = "fix_print.html" > < em > fix print< / em > < / a > command, which will print a string
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periodically during a simulation. Second, the print command can be
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used as an argument to the < em > every< / em > option of the < a class = "reference internal" href = "run.html" > < em > run< / em > < / a >
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command. Third, the print command could appear in a section of the
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input script that is looped over (see the < a class = "reference internal" href = "jump.html" > < em > jump< / em > < / a > and
< a class = "reference internal" href = "next.html" > < em > next< / em > < / a > commands).< / p >
< p > See the < a class = "reference internal" href = "variable.html" > < em > variable< / em > < / a > command for a description of < em > equal< / em >
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style variables which are typically the most useful ones to use with
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the print command. Equal-style variables can calculate formulas
involving mathematical operations, atom properties, group properties,
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thermodynamic properties, global values calculated by a
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< a class = "reference internal" href = "compute.html" > < em > compute< / em > < / a > or < a class = "reference internal" href = "fix.html" > < em > fix< / em > < / a > , or references to other
< a class = "reference internal" href = "variable.html" > < em > variables< / em > < / a > .< / p >
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< div class = "section" id = "restrictions" >
< h2 > Restrictions< a class = "headerlink" href = "#restrictions" title = "Permalink to this headline" > ¶< / a > < / h2 >
< blockquote >
< div > none< / div > < / blockquote >
< / div >
< div class = "section" id = "related-commands" >
< h2 > Related commands< a class = "headerlink" href = "#related-commands" title = "Permalink to this headline" > ¶< / a > < / h2 >
< p > < a class = "reference internal" href = "fix_print.html" > < em > fix print< / em > < / a > , < a class = "reference internal" href = "variable.html" > < em > variable< / em > < / a > < / p >
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< div class = "section" id = "default" >
< h2 > Default< a class = "headerlink" href = "#default" title = "Permalink to this headline" > ¶< / a > < / h2 >
< p > The option defaults are no file output and screen = yes.< / p >
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