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Selecting only numeric columns from a data frame
...de
## nums <- sapply(x, is.numeric)
For a more idiomatic modern R I'd now recommend
x[ , purrr::map_lgl(x, is.numeric)]
Less codey, less reflecting R's particular quirks, and more straightforward, and robust to use on database-back-ended tibbles:
dplyr::select_if(x, is.numeric)
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Nearest neighbors in high-dimensional data?
...back on how to find the nearest neighbors for a given vector. My vector is now 21 dimensions and before I proceed further, because I am not from the domain of Machine Learning nor Math, I am beginning to ask myself some fundamental questions:
...
Can you detect “dragging” in jQuery?
...n threshold on mouseup jsfiddle.net/W7tvD/1649 Works like a charm for me now, thanks!
– halfbit
Feb 26 '16 at 12:30
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What's the opposite of chr() in Ruby?
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Now that Ruby 1.9 has changed the meaning of 'A'[0], this is the more portable method.
– AShelly
Nov 22 '08 at 1:11
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How to remove unused imports from Eclipse
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I know this is a very old thread. I found this way very helpful for me:
Go to Window → Preferences → Java → Editor → Save Actions.
Check the option "Perform the selected actions on save".
Check the option "Organize imp...
Is volatile expensive?
...e of this and actually share the cached reference to the requesting CPU - now the request CPU has a copy of that memory in its CPU cache. (It never had to look in main memory for the reference)
There is quite a bit more of protocol involved but this gives an idea of what is going on. Also to answ...
Changing default shell in Linux [closed]
...l prompt you to enter your password.
Your default login shell is /bin/bash now. You must log out and log back in to see this change.
The following is quoted from man page:
The chsh command changes the user login shell. This determines the
name
of the users initial login command. A no...
Razor comment syntax
... Actually, it's still correct but they added a new @* * syntax. So now there are three ways to comment. Not just the one by JarretV.
– Buildstarted
Nov 15 '10 at 17:26
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How can I check the extension of a file?
...rmalise it to lowercase.
ext = os.path.splitext(fp)[-1].lower()
# Now we can simply use == to check for equality, no need for wildcards.
if ext == ".mp3":
print fp, "is an mp3!"
elif ext == ".flac":
print fp, "is a flac file!"
else:
print fp, "is an unkno...
Error : The service is invalid
...to clear the DerivedData as @AminNegm-Awad mentioned. I restarted IDE too, now it's all fine. Superb answer and comments!
– Vijay Kumar Kanta
Apr 10 '19 at 12:25
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