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Numpy: Get random set of rows from 2D array
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This is a similar answer to the one Hezi Rasheff provided, but simplified so newer python users understand what's going on (I noticed many new datascience students fetch random samples in the weirdest ways because they don't know what they are doing in pyth...
MVVM: Tutorial from start to finish?
...son Dolinger's awesome video. Although I have found many, I have not found one that takes me from start to finish. What I really want is a tutorial that doesn't assume any previous WPF knowledge.
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What is the purpose of shuffling and sorting phase in the reducer in Map Reduce Programming?
...nce the reducers get data from many mappers).
Partitioning, that you mentioned in one of the answers, is a different process. It determines in which reducer a (key, value) pair, output of the map phase, will be sent. The default Partitioner uses a hashing on the keys to distribute them to the reduc...
Convert string date to timestamp in Python
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it assumes midnight 01/12/2011 in local timezone. If input is in UTC; you could use calendar.timegm() or .toordinal()
– jfs
Nov 17 '13 at 19:56
55
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Trying to fix line-endings with git filter-branch, but having no luck
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The easiest way to fix this is to make one commit that fixes all the line endings. Assuming that you don't have any modified files, then you can do this as follows.
# From the root of your repository remove everything from the index
git rm --cached -r .
# Change...
What reason is there to use null instead of undefined in JavaScript?
...s in the conventions of how you use them in your system. As some have mentioned, some people use null for meaning "no object" where you might sometimes get an object while undefined means that no object was expected (or that there was an error). My problem with that is its completely arbitrary, and ...
DateTimePicker: pick both date and time
...tomFormat = date + " " + time You also can constrain, say, the time component manually: Dim date As String = CultureInfo...ShortDatePattern Dim time As String = CultureInfo...ShortTimePattern dtpThing.Format = DateTimePickerFormat.Custom dtpThingEnd.CustomFormat = date + " HH:mm"
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Why can't I use background image and color together?
...u use the composite style background to set both separately, only the last one will be used, that's one possible reason why your color is not visible:
background: green; /* will be ignored */
background: url(images/shadow.gif) right no-repeat;
There is no way to specifically limit the background ...
What is private bytes, virtual bytes, working set?
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The short answer to this question is that none of these values are a reliable indicator of how much memory an executable is actually using, and none of them are really appropriate for debugging a memory leak.
Private Bytes refer to the amount of memory that the proce...
How to implement a rule engine?
...ring, string> {
{ "greater_than", "GreaterThan" },
{ "hasAtLeastOne", "Contains" }
};
The code uses the type User for simplicity. You can replace User with a generic type T to have a generic Rule compiler for any types of objects. Also, the code should handle errors, like unknown operato...