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Count number of occurences for each unique value
...able)
# Generate a data table object, which draws a number 10^7 times
# from 1 to 10 with replacement
DT<-data.table(x=sample(1:10,1E7,TRUE))
# Count Frequency of each factor level
DT[,.N,by=x]
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Creating an Android trial application that expires after a fixed time period
...on't know the reason my device is running android lollipop, when i set day from dashboard, then day shows in negative value after few minutes, it says trial expired, even though i have many days still in dashboard. I also tested on nougat device, seems to be working fine on naugat. maybe it has some...
How to initialize an array in one step using Ruby?
... was a really long expression, you might want to put it on a separate line from the array creation.
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When should I mock?
...ying to test some logic in your unit of code but you need to get something from another object and what is returned from this dependency might affect what you are trying to test - mock that object.
A great podcast on the topic can be found here
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XmlSerializer: remove unnecessary xsi and xsd namespaces
...ng an object in .NET, I have updated this post and repeated my answer here from the afore-mentioned link. The example used in this answer is the same example used for the other question. What follows is copied, verbatim.
After reading Microsoft's documentation and several solutions online, I have...
JPG vs. JPEG image formats
... application use, and .jpeg , with which Image Capture saves the images from scanning with my Canon MX455 printer. LaTeX doesn't seem to distinguish, as I gave it a .jpeg with the extension changed to .jpg and the result seems to be the same as if it had been a .jpg right from the start...
Parse DateTime string in JavaScript
... dates at all, it just tests if the Date constructor can make a valid date from the input. The two aren't the same thing.
– RobG
Mar 17 '16 at 23:01
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How to print a linebreak in a python function?
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@user3527975, I mean backwards in the sense of reversed from how it should be.
– Winston Ewert
Mar 1 '16 at 17:52
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Visual Studio (2008) 'Clean Solution' Option
What does this option do? It is accessible from the Build menu.
7 Answers
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Python element-wise tuple operations like sum
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from numpy import array
a = array( [1,2,3] )
b = array( [3,2,1] )
print a + b
gives array([4,4,4]).
See http://www.scipy.org/Tentative_NumPy_Tutorial
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