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About Android image and asset sizes
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mdpi is the reference density -- that is, 1 px on an mdpi display is equal to 1 dip. The ratio for asset scaling is:
ldpi | mdpi | tvdpi | hdpi | xhdpi | xxhdpi | xxxhdpi
0.75 | 1 | 1.33 | 1.5 | 2 | 3 | 4
Although you don't really need to worry about tv...
Generate all permutations of a list without adjacent equal elements
...lgorithm returns optimal solutions, by the following logic. We call a prefix (partial solution) safe if it extends to an optimal solution. Clearly the empty prefix is safe, and if a safe prefix is a whole solution then that solution is optimal. It suffices to show inductively that each greedy step m...
What is the difference between map and flatMap and a good use case for each?
Can someone explain to me the difference between map and flatMap and what is a good use case for each?
16 Answers
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Getting hold of the outer class object from the inner class object
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Within the inner class itself, you can use OuterClass.this. This expression, which allows to refer to any lexically enclosing instance, is described in the JLS as Qualified this.
I don't think there's a way to get the instance from outside the code of the inner class though. Of course, you...
Optional Parameters with C++ Macros
...e to a bug in the MSVC compiler which they have acknowledged but haven't fixed in nearly a decade. However, workarounds are available.
– BeeOnRope
Nov 22 '17 at 19:45
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Why is @font-face throwing a 404 error on woff files?
I'm using @font-face on my company's site and it works/looks great. Except Firefox and Chrome will throw a 404 error on the .woff file. IE does not throw the error. I have the fonts located at the root but I've tried with the fonts in the css folder and even giving the entire url for the font. I...
Convert List into Comma-Separated String
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In .NET 3.5 and below you have to explicitly convert your list to array with lst.ToArray(), as there is no direct overload there yet.
– Anton
Dec 15 '13 at 11:09
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Fluent and Query Expression — Is there any benefit(s) of one over other?
...and it saves me tons of time, and lines of code. However, the fluent syntax seems to come much more natural to me than the query expression syntax.
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GroupBy pandas DataFrame and select most common value
...: ['NY','New','Spb','NY']})
source.groupby(['Country','City']).agg(lambda x:x.value_counts().index[0])
In case you are wondering about performing other agg functions in the .agg()
try this.
# Let's add a new col, account
source['account'] = [1,2,3,3]
source.groupby(['Country','City']).agg(mod ...