make sure all ur opt.sout and opt.in are prepared
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makedata.pl to make ur data files for 00elastic_QE.pl
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00elastic_QE.pl to Change atom positions ($random) and boxs ($scale)
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01elastic_QE.pl to get pressure from 00elastic_QE.pl
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02elastic_QE.pl to calculate preesure ($constant must = $scale) and output the file elastic_Opt_*