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How to remove last n characters from every element in the R vector
... an example of what I would do. I hope it's what you're looking for.
char_array = c("foo_bar","bar_foo","apple","beer")
a = data.frame("data"=char_array,"data2"=1:4)
a$data = substr(a$data,1,nchar(a$data)-3)
a should now contain:
data data2
1 foo_ 1
2 bar_ 2
3 ap 3
4 b 4
...
C＋＋模板的特化 - C/C++ - 清泛网 - 专注C/C++及内核技术
...ue;
}
};
混合型的：
template<typename T1, typename T2>
class X {...};
template<typename T>
class X<vector<T>, int&> {...}; //至于这里怎么都把T2搞没了变成只依赖一个模板参数T了的问题，大家别着急，我来告诉你个本质的东西，把我这么三点...
Fast permutation -> number -> permutation mapping algorithms
... In general, the k'th digit will have base b[k] = k + 2. The highest value allowed for digit k is h[k] = b[k] - 1 = k + 1.
Our rule about the weights w[k] of digits requires that the sum of h[i] * w[i], where i goes from i = 0 to i = k, is equal to 1 * w[k+1]. Stated recurrently, w[k+1] = w[k] + h[...
How can I draw vertical text with CSS cross-browser?
...lculate these)..
});
text.show(true);
This will work in IE6+ and all modern browsers, however, unfortunately I think you need at least FF3.0.
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Deserializing JSON to .NET object using Newtonsoft (or LINQ to JSON maybe?)
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ya I've actually done a bit more reading and testing...found this to be a nice way of doing it as well...Newtonsoft, pretty nice library, I'll post my example for others
– J Benjamin
Jan 20 '11 at 1...
Functional style of Java 8's Optional.ifPresent and if-not-Present?
... other components.
by the way now its name is more descriptive it is actually Consumer>
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Append values to query string
...Fixture]
public class UriExtensionsTests {
[Test]
public void Add_to_query_string_dictionary_when_url_contains_no_query_string_and_values_is_empty_should_return_url_without_changing_it() {
Uri url = new Uri("http://www.domain.com/test");
var values = new Dictionary<string, s...
Why is '+' not understood by Python sets?
...t int/long) define this operation across a sequence of boolean values and call it "bitwise or". In fact this operation is so similar to the set union that binary integers are sometimes also called "Bit sets", where the elements in the set are taken to be the natural numbers.
Because int already de...
How do I make python wait for a pressed key?
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@JonTirsen that's because Python 2.7 has a function called input which evaluates the string you input. To fix, use raw_input
– Samy Bencherif
Dec 3 '15 at 3:16
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What is the apply function in Scala?
...ling and verbing nouns ( an AddTwo class has an apply that adds two!) examples.
3 Answers
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