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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...
What is pseudopolynomial time? How does it differ from polynomial time?
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254
To understand the difference between polynomial time and pseudopolynomial time, we need to start...
How to Correctly Use Lists in R?
...Why do these two expressions not return the same result?
x = list(1, 2, 3, 4); x2 = list(1:4)
A list can contain any other class as each element. So you can have a list where the first element is a character vector, the second is a data frame, etc. In this case, you have created two different lis...
Reference: Comparing PHP's print and echo
... PRINT ~3 ~2
4 FREE ~3
5 > RETURN 1
The very first opcode that gets generated is that corresponding to the 'print ...
What is the correct way of using C++11's range-based for?
...
4 Answers
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Choosing a file in Python with simple Dialog
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edited Aug 26 at 20:40
Try431
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answered Aug 26 '10 at 21:22
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What GRANT USAGE ON SCHEMA exactly do?
...05
J_H
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answered Jun 27 '13 at 23:45
Craig RingerCraig R...
Getting name of the class from an instance
...g the need.
– Gleno
Aug 3 '13 at 18:41
2
Remember to #import <objc/objc-runtime.h> to able ...