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How to convert a data frame column to numeric type?
...at has helped me: if you have ranges of variables to convert (or just more then one), you can use sapply.
A bit nonsensical but just for example:
data(cars)
cars[, 1:2] <- sapply(cars[, 1:2], as.factor)
Say columns 3, 6-15 and 37 of you dataframe need to be converted to numeric one could:
da...
WatiN or Selenium? [closed]
...spawn myself) is a big plus. I can fiddle around in an existing instance...then run a bit of script...then fiddle again etc. This is harder to do with Selenium, though I suppose "pauses" could be embedded in the script during which time I could fiddle directly with the browser.
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How to encode the filename parameter of Content-Disposition header in HTTP?
...the file correctly but keeps the .part extension (e.g foo,bar.pdf-1.part). Then, of course the file won't open correctly because the application is not associated with .part. Other ASCII chars seem to work OK.
– catchdave
Jan 11 '12 at 0:09
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Is inline assembly language slower than native C++ code?
... them all busy. If you write in C you may use PGO but in assembly you will then need a great knowledge of that specific architecture (and rethink and redo everything for another architecture). For small tasks the compiler usually does it better, and for complex tasks usually the work isn't repaid (a...
Tips for using Vim as a Java IDE? [closed]
...ymlink vi to vim.
You can get code completion with eclim
Or you can get vi functionality within Eclipse with viPlugin
Syntax highlighting is great with vim
Vim has good support for writing little macros like running ant/maven builds
Have fun :-)
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How can I get the executing assembly version?
... public static readonly Version Version = Reference.GetName().Version;
}
Then I can cleanly reference CoreAssembly.Version in my code as required.
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What is content-type and datatype in an AJAX request?
...thing like:
{"name":"John Doe"}
and expecting back:
{"success":true}
Then you should have:
var data = {"name":"John Doe"}
$.ajax({
dataType : "json",
contentType: "application/json; charset=utf-8",
data : JSON.stringify(data),
success : function(result) {
alert(result....
Why can't (or doesn't) the compiler optimize a predictable addition loop into a multiplication?
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then why does clang perform this kind of optimization?
– Jason S
Dec 31 '19 at 16:14
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Getting current directory in .NET web application
...g request:
http://www.example.com/shop/products/GetProduct.aspx?id=2342
then:
Server.MapPath(".") returns D:\WebApps\shop\products
Server.MapPath("..") returns D:\WebApps\shop
Server.MapPath("~") returns D:\WebApps\shop
Server.MapPath("/") returns C:\Inetpub\wwwroot
Server.MapPath("/shop") retur...
What is the difference between
...is just a normal <% with a Ruby comment # right after it.... Yeah, it's fun to think it's something special, but isn't it just an ERB idiom rather than a special syntactic construct?
– BalinKingOfMoria Reinstate CMs
Dec 9 '15 at 21:09
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