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Techniques for Tracing Constraints
...s could not deduce x ~ y for some x and y . You can usually throw GHC a bone and simply add the isomorphism to the function constraints, but this is a bad idea for several reasons:
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Regular Expression For Duplicate Words
I'm a regular expression newbie, and I can't quite figure out how to write a single regular expression that would "match" any duplicate consecutive words such as:
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Difference between single and double square brackets in Bash
I'm reading bash examples about if but some examples are written with single square brackets:
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How does the Comma Operator work
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It would be equal to b.
The comma operator has a lower precedence than assignment.
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Return multiple values to a method caller
I read the C++ version of this question but didn't really understand it.
27 Answers
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Sorting an array of objects by property values
I've got the following objects using AJAX and stored them in an array:
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How can I verify if one list is a subset of another?
I need to verify if a list is a subset of another - a boolean return is all I seek.
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Scala: Abstract types vs generics
I was reading A Tour of Scala: Abstract Types . When is it better to use abstract types?
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Laravel 4 Eloquent Query Using WHERE with OR AND OR?
How do I say WHERE (a = 1 OR b =1 ) AND (c = 1 OR d = 1)
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Split delimited strings in a column and insert as new rows [duplicate]
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Here is another way of doing it..
df <- read.table(textConnection("1|a,b,c\n2|a,c\n3|b,d\n4|e,f"), header = F, sep = "|", stringsAsFactors = F)
df
## V1 V2
## 1 1 a,b,c
## 2 2 a,c
## 3 3 b,d
## 4 4 e,f
s <- strsplit(df$V2, split = ",")
data.frame(V1 = ...