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How to design a product table for many kinds of product where each product has many parameters
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RabbitMQ and relationship between channel and connection
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What is the canonical way to check for errors using the CUDA runtime API?
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How to programmatically display version/build number of target in iOS app?
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There are 2 Numbers!
The marketing release number is for the customers, called version number. ...
How to clear variables in ipython?
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answered Apr 8 '14 at 10:27
aisbaaaisbaa
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What is pseudopolynomial time? How does it differ from polynomial time?
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To understand the difference between polynomial time and pseudopolynomial time, we need to start...
Apply a function to every row of a matrix or a data frame
...:6, nrow=3, byrow=TRUE)
R> M
[,1] [,2]
[1,] 1 2
[2,] 3 4
[3,] 5 6
R> apply(M, 1, function(x) 2*x[1]+x[2])
[1] 4 10 16
R>
This takes a matrix and applies a (silly) function to each row. You pass extra arguments to the function as fourth, fifth, ... arguments to app...