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Warning message: In `…` : invalid factor level, NA generated
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If you are reading directly from CSV file then do like this.
myDataFrame <- read.csv("path/to/file.csv", header = TRUE, stringsAsFactors = FALSE)
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LINQPad [extension] methods [closed]
...ers.csv");
This will write the content of the table Customers to the CSV file c:\temp\customers.csv. You can also find a nice example how to use Util.WriteCsv and then display the CSV data in Linqpad's result window here.
Hints:
To get/create a CSV file which is in the same directory as the qu...
Difference between $.ajax() and $.get() and $.load()
...the situation that determines which one to use. Need to send the info to a file internally? Use .post (this would be most of the cases). Need to send the info in such a way that you could provide a link to the specific moment? Use .get. Both of them allow a callback where you can handle the response...
How to save a plot as image on the disk?
...he device using dev.off()
Some example code for saving the plot to a png file:
fit <- lm(some ~ model)
png(filename="your/file/location/name.png")
plot(fit)
dev.off()
This is described in the (combined) help page for the graphical formats ?png, ?bmp, ?jpeg and ?tiff as well as in the separa...
Ruby on Rails Server options [closed]
...servers.
Apache vs Nginx
They're both web servers. They can serve static files but - with the right modules - can also serve dynamic web apps e.g. those written in PHP. Apache is more popular and has more features, Nginx is smaller and faster and has less features.
Neither Apache nor Nginx can se...
Is there a code obfuscator for PHP? [closed]
...or very big projects. They can't handle variables that are included in one file and used in another, for instance.
10 Answe...
Remove duplicate elements from array in Ruby
...hat uniq takes a block, so if you have a have an array of keys:
["bucket1:file1", "bucket2:file1", "bucket3:file2", "bucket4:file2"]
and you want to know what the unique files are, you can find it out with:
a.uniq { |f| f[/\d+$/] }.map { |p| p.split(':').last }
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When would you use the different git merge strategies?
...en those branches. The branches are just merged and nothing is done to the files. If you want to merge in the other branch and every time there is the question "our file version or their version" you can use git merge -X ours)
Subtree
Subtree is useful when you want to merge in another project int...
How to do a safe join pathname in ruby?
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I recommend using File.join
>> File.join("path", "to", "join")
=> "path/to/join"
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How to add manifest permission to an application?
...ing to access HTTP link using HttpURLConnection in Android to download a file, but I am getting this warning in LogCat :
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