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Strange, unexpected behavior (disappearing/changing values) when using Hash default value, e.g. Hash
...s in the array, despite h[1] still giving us a value? Here’s a hint:
h[42] #=> ["a", "b"]
The array returned by each [] call is just the default value, which we’ve been mutating all this time so now contains our new values. Since << doesn’t assign to the hash (there can never be a...
Find column whose name contains a specific string
...exactly match it. I'm searching for 'spike' in column names like 'spike-2' , 'hey spike' , 'spiked-in' (the 'spike' part is always continuous).
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FIND_IN_SET() vs IN()
I have 2 tables in my database. One is for orders, and one is for companies.
6 Answers
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Splitting String with delimiter
I am currently trying to split a string 1128-2 so that I can have two separate values. For example, value1: 1128 and value2: 2, so that I can then use each value separately. I have tried split() but with no success. Is there a specific way Grails handles this, or a better way of doing it?
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Remove first element from $@ in bash [duplicate]
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answered Apr 23 '10 at 19:29
AmberAmber
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How to track down a “double free or corruption” error
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62
If you're using glibc, you can set the MALLOC_CHECK_ environment variable to 2, this will cause ...
Syntax for creating a two-dimensional array
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12 Answers
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How to decide font color in white or black depending on background color?
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22 Answers
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How to randomize (or permute) a dataframe rowwise and columnwise?
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234
Given the R data.frame:
> df1
a b c
1 1 1 0
2 1 0 0
3 0 1 0
4 0 0 0
Shuffle row-wise:
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How to use filter, map, and reduce in Python 3
filter , map , and reduce work perfectly in Python 2. Here is an example:
7 Answers
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