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How to show math equations in general github's markdown(not github's blog)
...line items use HTML ampersand entity codes. An example that combines this idea with subscript text in markdown is: hθ(x) = θo x + θ1x, the code for which follows.
h<sub>&theta;</sub>(x) = &theta;<sub>o</sub> x + &theta;<sub>1</sub>x
HTML amp...
Dynamic constant assignment
... mis-steps -- these should either be fully immutable, or dump the constant idea altogether. From a coder's perspective, a constant is declarative and intentional, a signal to other that "this value is truly unchangeable once declared/assigned."
But sometimes an "obvious declaration" actually forec...
Rails: What's a good way to validate links (URLs)?
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Following Simone's idea, you can easily create you own validator.
class UrlValidator < ActiveModel::EachValidator
def validate_each(record, attribute, value)
return if value.blank?
begin
uri = URI.parse(value)
resp = u...
Does the ternary operator exist in R?
...e the ? operator to (almost) work like the ternary operator (THIS IS A BAD IDEA):
`?` <- function(x, y) { y <-substitute(y); if(x) eval(y[[2]], parent.frame()) else eval(y[[3]], parent.frame()) }
x <- 1:3
length(x) ? (x*2) : 0
x <- numeric(0)
length(x) ? (x*2) : 0
for(i in 1:5) cat(i,...
How to count total lines changed by a specific author in a Git repository?
...ons, but what are the numbers telling me? There are two rows and I have no idea what they are telling me. Lines chenged and added?
– Informatic0re
Aug 7 '15 at 12:58
2
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Where should Rails 3 custom validators be stored?
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Good idea but your code needs some cleanup: config.autoload_paths += %W(#{config.root}/lib/validators/)
– aNoble
May 26 '11 at 20:46
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emacs zoom in/zoom out
...ork for me, even with (setq w32-pass-extra-mouse-buttons-to-system t). Any ideas? (I'm on Windows 7.)
– Brady Trainor
Sep 26 '14 at 3:34
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Can I delete a git commit but keep the changes?
...sh apply
In your case you moved around branches a bit more, but the same idea still applies.
Hope this helps.
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Should I use char** argv or char* argv[]?
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Had no idea this one exists: *argv[static 1]
– superlukas
Mar 1 '15 at 3:33
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Random row from Linq to Sql
...fetch every element unless you get the count.
What you can do is keep the idea of a "current" value and the current count. When you fetch the next value, take a random number and replace the "current" with "new" with a probability of 1/n where n is the count.
So when you read the first value, you ...