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Implications of foldr vs. foldl (or foldl')
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The recursion for foldr f x ys where ys = [y1,y2,...,yk] looks like
f y1 (f y2 (... (f yk x) ...))
whereas the recursion for foldl f x ys looks like
f (... (f (f x y1) y2) ...) yk
An important difference here is that if the result of f x y can be computed using only...
Finding duplicates in O(n) time and O(1) space
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edited Nov 25 '15 at 9:44
answered Apr 21 '11 at 3:54
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Acronyms in CamelCase [closed]
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206
Some guidelines Microsoft has written about camelCase are:
When using acronyms, use Pascal...
Create unique constraint with null columns
..., menu_id, recipe_id)
WHERE menu_id IS NOT NULL;
CREATE UNIQUE INDEX favo_2col_uni_idx ON favorites (user_id, recipe_id)
WHERE menu_id IS NULL;
This way, there can only be one combination of (user_id, recipe_id) where menu_id IS NULL, effectively implementing the desired constraint.
Possible dra...
How to plot two columns of a pandas data frame using points?
...he plotted line when calling df.plot:
df.plot(x='col_name_1', y='col_name_2', style='o')
The style argument can also be a dict or list, e.g.:
import numpy as np
import pandas as pd
d = {'one' : np.random.rand(10),
'two' : np.random.rand(10)}
df = pd.DataFrame(d)
df.plot(style=['o','rx'])...
Adding up BigDecimals using Streams
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3.1. We supply an identity value for addition, namely BigDecimal.ZERO.
3.2. We specify the BinaryOperator<BigDecimal>, which adds two BigDecimal's, via a method reference BigDecimal::add.
Updated answer, after edit
I see that you have added new data, therefore the new answer will become:
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Check if directory mounted with bash
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answered Feb 23 '12 at 23:12
Christopher NeylanChristopher Neylan
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How to handle initializing and rendering subviews in Backbone.js?
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260
This is a great question. Backbone is great because of the lack of assumptions it makes, but i...
How to programmatically round corners and set random background colors
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213
Instead of setBackgroundColor, retrieve the background drawable and set its color:
v.setBackg...
How to convert a clojure keyword into a string?
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kotarakkotarak
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