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Append value to empty vector in R?
...appending for larger vectors.
set.seed(21)
values <- sample(letters, 1e4, TRUE)
vector <- character(0)
# slow
system.time( for (i in 1:length(values)) vector[i] <- values[i] )
# user system elapsed
# 0.340 0.000 0.343
vector <- character(length(values))
# fast(er)
system.time(...
Onclick javascript to make browser go back to previous page?
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460
Add this in your input element
<input
action="action"
onclick="window.history.go(-...
Print multiple arguments in Python
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edited Jun 1 '18 at 4:17
answered Mar 8 '13 at 3:52
B...
MySQL - force not to use cache for testing speed of query
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RJ Anoop
7311414 silver badges2525 bronze badges
answered Oct 8 '08 at 9:09
Jarod ElliottJarod Elliott
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NSDate beginning of day and end of day
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edited Jan 10 '18 at 22:54
shim
6,41999 gold badges5656 silver badges9292 bronze badges
answered Nov 10...
Passing data to Master Page in ASP.NET MVC
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answered Apr 14 '09 at 1:33
Generic ErrorGeneric Error
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What is the easiest way to make a C++ program crash?
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14
Note that a crash through abort() doesn't call any destructors or atexit functions, though that will likely not matter here.
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Why is my program slow when looping over exactly 8192 elements?
... on large powers-of-two.
Core i7 920 @ 3.5 GHz
Original code:
8191: 1.499 seconds
8192: 2.122 seconds
8193: 1.582 seconds
Interchanged Outer-Loops:
8191: 0.376 seconds
8192: 0.357 seconds
8193: 0.351 seconds
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How do I “decompile” Java class files? [closed]
...r features of J2SE 5.0 (Java SE 5), has been published on September 30, 2004.
The lastest Java version supported by JAD, the famous Java decompiler written by Mr. Pavel Kouznetsov, is JDK 1.3.
Most of the Java decompilers downloadable today from the Internet, such as “DJ Java Decompiler” or “C...
Tools for JPEG optimization? [closed]
...ment? For PNGs I'm currently using PNGOUT , and it generally saves around 40% bandwidth/image size.
14 Answers
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