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Why isn't sizeof for a struct equal to the sum of sizeof of each member?
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This is because of padding added to satisfy alignment constraints. Data structure alignment impacts both performance and correctness of programs:
Mis-aligned access might be a hard error (often SIGBUS).
Mis-aligned access might be a soft error.
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Different bash prompt for different vi editing mode?
When using vi mode (set -o vi) with Bash, it would be nice to have a prompt that depends on the mode you are currently in (insert or command). How does one find out this editing mode?
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Why does Lua have no “continue” statement?
I have been dealing a lot with Lua in the past few months, and I really like most of the features but I'm still missing something among those:
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Understanding slice notation
...ems start through the rest of the array
a[:stop] # items from the beginning through stop-1
a[:] # a copy of the whole array
There is also the step value, which can be used with any of the above:
a[start:stop:step] # start through not past stop, by step
The key point to remember ...
Split a vector into chunks in R
I have to split a vector into n chunks of equal size in R. I couldn't find any base function to do that. Also Google didn't get me anywhere. So here is what I came up with, hopefully it helps someone some where.
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What is Weak Head Normal Form?
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I'll try to give an explanation in simple terms. As others have pointed out, head normal form does not apply to Haskell, so I will not consider it here.
Normal form
An expression in normal form is fully evaluated, and no sub-expression could be evaluated ...
How can I delete one element from an array by value
I have an array of elements in Ruby
15 Answers
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CSS \9 in width property
What is the meaning of this? I am guessing it is a browser hack, but I have not been able to find what exactly it does.
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Find intersection of two nested lists?
I know how to get an intersection of two flat lists:
20 Answers
20
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Double Iteration in List Comprehension
In Python you can have multiple iterators in a list comprehension, like
10 Answers
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