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How to round a number to n decimal places in Java
...double values. That is fine if you don't care much whether it rounds up or down. But if you want accurate rounding, then you need to take the expected accuracy of the values into account. Floating point values have a binary representation internally. That means that a value like 2.7735 does not actu...
Does Python have a package/module management system?
...download and publish packages. Python has the Python Package Index, PyPI. https://pypi.python.org/pypi
Let's compare its pages with those of RubyGems and Npm (the Node package manager).
https://rubygems.org/gems/rails RubyGems page for the package rails
https://www.npmjs.org/package/express Np...
SQL query to find record with ID not in another table
... pk do not exist in B.
Old but still gold, specific to PostgreSQL though: https://explainextended.com/2009/09/16/not-in-vs-not-exists-vs-left-join-is-null-postgresql/
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How to scale down a range of numbers with a known min and max value
...m trying to figure out how to take a range of numbers and scale the values down to fit a range. The reason for wanting to do this is that I am trying to draw ellipses in a java swing jpanel. I want the height and width of each ellipse to be in a range of say 1-30. I have methods that find the min...
Using IoC for Unit Testing
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Android TextWatcher.afterTextChanged vs TextWatcher.onTextChanged
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Why Collections.sort uses merge sort instead of quicksort?
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“continue” in cursor.forEach()
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How to round up a number to nearest 10?
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floor() will go down.
ceil() will go up.
round() will go to nearest by default.
Divide by 10, do the ceil, then multiply by 10 to reduce the significant digits.
$number = ceil($input / 10) * 10;
Edit: I've been doing it this way fo...
How to do a recursive find/replace of a string with awk or sed?
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For me the easiest solution to remember is https://stackoverflow.com/a/2113224/565525, i.e.:
sed -i '' -e 's/subdomainA/subdomainB/g' $(find /home/www/ -type f)
NOTE: -i '' solves OSX problem sed: 1: "...": invalid command code .
NOTE: If there are too many files ...