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javac : command not found
...he OpenJDK Development Environment. You can install java-devel or java-1.6.0-openjdk-devel, which both include javac.
By the way: you can find out which package provides javac with a yum search, e.g.
su -c 'yum provides javac'
on more recent releases of CentOS e.g. 6 the command changes to
su -...
Oracle: If Table Exists
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+500
The best and most efficient way is to catch the "table not found" exception: this avoids the overhead of checking if the table exists...
Preferred Github workflow for updating a pull request after code review
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answered Oct 30 '11 at 19:45
AmberAmber
421k7070 gold badges575575 silver badges516516 bronze badges
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Is it intended by the C++ standards committee that in C++11 unordered_map destroys what it inserts?
...curious, I took a look at the g++-4.8 headers.
bits/stl_map.h, lines 598-603
template<typename _Pair, typename = typename
std::enable_if<std::is_constructible<value_type,
_Pair&&>::value>::type>
std::pair<...
How can I quantify difference between two images?
... img2 = to_grayscale(imread(file2).astype(float))
# compare
n_m, n_0 = compare_images(img1, img2)
print "Manhattan norm:", n_m, "/ per pixel:", n_m/img1.size
print "Zero norm:", n_0, "/ per pixel:", n_0*1.0/img1.size
How to compare. img1 and img2 are 2D SciPy arrays here:
def comp...
What is Full Text Search vs LIKE
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In general, there is a tradeoff between "precision" and "recall". High precision means that fewe...
What is the purpose of the “Prefer 32-bit” setting in Visual Studio and how does it actually work?
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edited May 30 '19 at 12:10
Sylvain Rodrigue
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How do I make a reference to a figure in markdown using pandoc?
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answered Apr 20 '12 at 21:42
N.N.N.N.
98266 silver badges33 bronze badges
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What exactly is Hot Module Replacement in Webpack?
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answered Jul 5 '14 at 15:09
Tobias K.Tobias K.
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Is there a way to change the spacing between legend items in ggplot2?
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ggplot2 v3.0.0 released in July 2018 has working options to modify legend.spacing.x, legend.spacing.y and legend.text.
Example: Increase horizontal spacing between legend keys
library(ggplot2)
ggplot(mtcars, aes(factor(cyl), fill ...