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How do you perform a left outer join using linq extension methods
... foo => foo.Foo_Id,
bar => bar.Foo_Id,
(x,y) => new { Foo = x, Bars = y })
.SelectMany(
x => x.Bars.DefaultIfEmpty(),
(x,y) => new { Foo=x.Foo, Bar=y});
...
Simple explanation of MapReduce?
...ry number, in this case, the function to "double every number" is function x = x * 2. And without mappings, I could write a simple loop, say
A = [1, 2, 3]
foreach (item in A) A[item] = A[item] * 2
and I'd have A = [2, 4, 6] but instead of writing loops, if I have a map function I could write
A =...
Why is lazy evaluation useful?
...g been wondering why lazy evaluation is useful. I have yet to have anyone explain to me in a way that makes sense; mostly it ends up boiling down to "trust me".
...
Placement of the asterisk in pointer declarations
...lly a death-trap then? Is there any specification or further reading that explains why int* test,test2 only makes the first variable a pointer?
– Michael Stum♦
Oct 7 '08 at 21:06
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Change x axes scale in matplotlib
...t:
import matplotlib.pyplot as plt
...
plt.ticklabel_format(style='sci', axis='x', scilimits=(0,0))
This applies scientific notation (i.e. a x 10^b) to your x-axis tickmarks
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How can I create an Asynchronous function in Javascript?
...provided natively, such as:
setInterval
setTimeout
requestAnimationFrame
XMLHttpRequest
WebSocket
Worker
Some HTML5 APIs such as the File API, Web Database API
Technologies that support onload
... many others
In fact, for the animation jQuery uses setInterval.
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Convert column classes in data.table
...oblem using data.table: How do I convert column classes? Here is a simple example: With data.frame I don't have a problem converting it, with data.table I just don't know how:
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Getting SyntaxError for print with keyword argument end=' '
...ave this python script where I need to run gdal_retile.py ,
but I get an exception on this line:
14 Answers
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How to take the first N items from a generator or list in Python? [duplicate]
...Slicing a list
top5 = array[:5]
To slice a list, there's a simple syntax: array[start:stop:step]
You can omit any parameter. These are all valid: array[start:], array[:stop], array[::step]
Slicing a generator
import itertools
top5 = itertools.islice(my_list, 5) # grab the first five element...
Drawing Isometric game worlds
... technique for mapping the tiles to the screen can be said that the tile's x and y coordinates are on the vertical and horizontal axes.
"Drawing in a diamond" approach:
By drawing an isometric map using "drawing in a diamond", which I believe refers to just rendering the map by using a nested for-...