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HashMap get/put complexity
We are used to saying that HashMap get/put operations are O(1). However it depends on the hash implementation. The default object hash is actually the internal address in the JVM heap. Are we sure it is good enough to claim that the get/put are O(1) ?
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How to filter Pandas dataframe using 'in' and 'not in' like in SQL
How can I achieve the equivalents of SQL's IN and NOT IN ?
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What is a stack trace, and how can I use it to debug my application errors?
Sometimes when I run my application it gives me an error that looks like:
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How to apply two CSS classes to a single element
Can i apply 2 classes to a single div or span or any html element? For example:
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Bootstrap 3 Navbar with Logo
I want to use the Bootstrap 3 default navbar with an image logo instead of text branding. What's the proper way of doing this without causing any issues with different screen sizes? I assume this a common requirement, but I haven't yet seen a good code sample. A key requirement other than having acc...
Convert string to a variable name
I am using R to parse a list of strings in the form:
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How can I print the contents of a hash in Perl?
I keep printing my hash as # of buckets / # allocated.
How do I print the contents of my hash?
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What is the relation between BLAS, LAPACK and ATLAS
I don't understand how BLAS, LAPACK and ATLAS are related and how I should use them together! I have been looking through all of their manuals and I have a general idea of BLAS and LAPACK and how to use them with the very few examples I find, but I can't find any actual examples using ATLAS to see h...
preventDefault() on an tag
I have some HTML and jQuery that slides a div up and down to show or hide` it when a link is clicked:
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How to use the “number_to_currency” helper method in the model rather than view?
I would like to use to_dollar method in my model like this:
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