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Subset of rows containing NA (missing) values in a chosen column of a data frame
...NULL" strings as is).
If using read.table() or read.csv(), you should consider the "na.strings" argument to do clean data import, and always work with real R NA values.
An example, working in both cases "NULL" and "NA" cells :
DF <- read.csv("file.csv", na.strings=c("NA", "NULL"))
new_DF <-...
Installing Apple's Network Link Conditioner Tool
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Excellent answer - I really didn't want to install Xcode since I don't do native iOS or Mac development. This was the only answer I've found that lets me install Network Link Conditioner without a multi-gigabyte download of Xcode.
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How to find an element by matching exact text of the element in Capybara
...rue instead of exact_text will show you a msg that exact option is only valid for XPATH.
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How do I merge a git tag onto a branch
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@learner a Tag identifies a specific commit. You can't merge into a specific commit so you'd need to move the tag to the commit you want. This would address the how on that: stackoverflow.com/questions/8044583/…
– Jo...
Why can I type alias functions and use them without casting?
...by reading the relevant part of the spec:
http://golang.org/ref/spec#Type_identity
The relevant distinction that I was unaware of was that of named and unnamed types.
Named types are types with a name, such as int, int64, float, string, bool. In addition, any type you create using 'type' is a nam...
Loop through each row of a range in Excel
...answered Sep 22 '09 at 23:58
David AndresDavid Andres
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Java: What is the difference between and ?
... var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled...
Does a break statement break from a switch/select?
..."crunching..")
break
default:
fmt.Println("idling..")
}
}
}
0idling..
1start
2idling..
3crunching..
4crunching..
5stop
Program exited.
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Lowercase JSON key names with JSON Marshal in Go
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I've just started to curse the go language - how stupid is this, why would they make the fields with lowercase letters in the generated JSON etc, etc. Then I came across this thread and thought "OMG That's brilliant!!!". I even jumped and explained my girlfriend why I am so exc...
Why are Docker container images so large?
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As @rexposadas said, images include all the layers and each layer includes all the dependencies for what you installed. It is also important to note that the base images (like fedora:latest tend to be very bare-bones. You may be surprised by ...