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Iterating over every two elements in a list
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You need a pairwise() (or grouped()) implementation.
For Python 2:
from itertools import izip
def pairwise(iterable):
"s -> (s0, s1), (s2, s3), (s4, s5), ..."
a = iter(iterable)
return izip(a, a)
for x, y in pairwise(l):
print "%d + %d = %d" % (x, y, x + y)
Or, more gen...
how to draw smooth curve through N points using javascript HTML5 canvas?
... With this algorithm is each successive curve meant to start from the previous curves end point?
– Lee Brindley
Dec 4 '13 at 5:31
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How to Loop through items returned by a function with ng-repeat?
...re processed if dirty == true $digest starts another depth-first traversal from $rootScope. $digest ends when dirty == false or number of traversals == 10. In the latter case, the error "10 $digest() iterations reached." will be logged.
Now about ngRepeat. For each watch.get call it stores objects ...
Histogram Matplotlib
...tlib solution to histograms, because the simple histogram_demo was removed from the matplotlib example gallery page.
Here is a solution, which doesn't require numpy to be imported. I only import numpy to generate the data x to be plotted. It relies on the function hist instead of the function bar a...
Can I stop 100% Width Text Boxes from extending beyond their containers?
...with the borders set on the div (that way you can remove the display:block from the input too). Something like:
<div style="border:1px solid gray;">
<input type="text" class="wide" />
</div>
Edit:
Another option is to, instead of removing the style from the input, compensate fo...
What are the options for storing hierarchical data in a relational database? [closed]
...he hierarchy.
The problem up until now has been that the coversion method from an Adjacecy List to Nested Sets has been frightfully slow because most people use the extreme RBAR method known as a "Push Stack" to do the conversion and has been considered to be way to expensive to reach the Nirvana o...
Fragment or Support Fragment?
I am developing an app that supports Android >= 4.0. It uses fragments from the android.app package. As I am facing problems with the older fragment implementation in 4.0, like this one , that are already fixed in the support library, I am considering switching back to the fragment implementation...
Heroku + node.js error (Web process failed to bind to $PORT within 60 seconds of launch)
...ort to a fixed number. Heroku adds the port to the env, so you can pull it from there. Switch your listen to this:
.listen(process.env.PORT || 5000)
That way it'll still listen to port 5000 when you test locally, but it will also work on Heroku.
You can check out the Heroku docs on Node.js here....
What is the difference between bottom-up and top-down?
...pically, you would perform a recursive call (or some iterative equivalent) from the root, and either hope you will get close to the optimal evaluation order, or obtain a proof that you will help you arrive at the optimal evaluation order. You would ensure that the recursive call never recomputes a s...
In Jinja2, how do you test if a variable is undefined?
Converting from Django, I'm used to doing something like this:
6 Answers
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