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Understanding exactly when a data.table is a reference to (vs a copy of) another data.table
...tl=0) 11,12
# ATTRIB: # ..snip..
.Internal(inspect(newDT))
# @0000000003D97A58 19 VECSXP g0c7 [OBJ,NAM(2),ATT] (len=2, tl=100)
# @00000000040ED7F8 14 REALSXP g0c2 [NAM(2)] (len=2, tl=0) 1,2
# @00000000040ED8D8 14 REALSXP g0c2 [NAM(2)] (len=2, tl=0) 11,200
# ATTRIB: # ..snip..
Notice how eve...
How do I interpolate strings?
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CodesInChaosCodesInChaos
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What is the difference between “#!/usr/bin/env bash” and “#!/usr/bin/bash”?
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Alec BennettAlec Bennett
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Is calculating an MD5 hash less CPU intensive than SHA family functions?
... 1024 bytes 8192 bytes
md5 30055.02k 94158.96k 219602.97k 329008.21k 384150.47k
sha1 31261.12k 95676.48k 224357.36k 332756.21k 396864.62k
Update: 10 months later with OS X 10.9, SHA-1 got slower on the same machine:
$ openssl speed md5 sha1
OpenSSL 0....
Position absolute but relative to parent
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DomenicDomenic
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一个自媒体的运营手记：我做公众号已经两年多了 - 资讯 - 清泛网 - 专注C/C...
...览量在下降，那么下降的这些人去那里看东西了，肯定是手机端，移动端的阅读以后将会成为主流，那么微信朋友圈肯定是最受益的，所以通过朋友圈推广效果肯定不会差。既然选择了这个渠道，那么下面就是内容了，寻找好的...
convert '1' to '0001' in JavaScript [duplicate]
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KooiIncKooiInc
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Addition for BigDecimal
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Vincent RamdhanieVincent Ramdhanie
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如何查看Oracle用户的SQL执行历史记录？ - 数据库(内核) - 清泛网 - 专注C/...
...启supplemental logging，默认是没有开启的。
conn / as sysdba
--安装LOGMINER
SQL> @$ORACLE_HOME/rdbms/admin/dbmslmd.sql;
SQL> @$ORACLE_HOME/rdbms/admin/dbmslm.sql;
SQL> @$ORACLE_HOME/rdbms/admin/dbmslms.sql;
SQL> @$ORACLE_HOME/rdbms/admin/prvtlm.plb;
--开启附加日志
alter ...
Count all occurrences of a string in lots of files with grep
..."... my that curry was strong" * >> wc :)
– icc97
Mar 23 '16 at 16:03
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