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What is the proper declaration of main?
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5 Answers
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Active
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Determine the data types of a data frame's columns
...is makes the example exactly reproducible
my.data <- data.frame(y=rnorm(5),
x1=c(1:5),
x2=c(TRUE, TRUE, FALSE, FALSE, FALSE),
X3=letters[1:5])
@Wilmer E Henao H's solution is very streamlined:
sapply(my.data, class)
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Pointers vs. values in parameters and return values
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twotwotwotwotwotwo
21.2k55 gold badges5959 silver badges5151 bronze badges
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Python csv string to array
... StringIO
import csv
scsv = """text,with,Polish,non-Latin,letters
1,2,3,4,5,6
a,b,c,d,e,f
gęś,zółty,wąż,idzie,wąską,dróżką,
"""
f = StringIO(scsv)
reader = csv.reader(f, delimiter=',')
for row in reader:
print('\t'.join(row))
simpler version with split() on newlines:
reader = csv...
in iPhone App How to detect the screen resolution of the device
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350
CGRect screenBounds = [[UIScreen mainScreen] bounds];
That will give you the entire screen's ...
Is it possible to implement a Python for range loop without an iterator variable?
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for i in xrange(n): f()
loop(lambda: <insert expression here>, 5)
But I think you can just live with the extra i variable.
Here is the option to use the _ variable, which in reality, is just another variable.
for _ in range(n):
do_something()
Note that _ is assigned the last re...
how to return index of a sorted list? [duplicate]
...ed items in the list. For example, if the list I want to sort is [2,3,1,4,5] , I need [2,0,1,3,4] to be returned.
7 Ans...
Java recursive Fibonacci sequence
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165
In fibonacci sequence each item is the sum of the previous two. So, you wrote a recursive algori...
Best way to add comments in erb
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357
Use the <%# %> sequence, e.g.
<%# This is a great comment! %>
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How can I convert my device token (NSData) into an NSString?
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answered Feb 21 '12 at 5:52
kulsskulss
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