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PHP Warning: PHP Startup: Unable to load dynamic library
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3. or install the missing expected extension
– Andrew
May 3 '17 at 12:58
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How to specify jackson to only use fields - preferably globally
...eatorVisibility(JsonAutoDetect.Visibility.NONE));
If you want it set globally, I usually access a configured mapper through a wrapper class.
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How does one reorder columns in a data frame?
... has four columns like so df[,c(1,2,3,4)].
Note the first comma means keep all the rows, and the 1,2,3,4 refers to the columns.
To change the order as in the above question do df2[,c(1,3,2,4)]
If you want to output this file as a csv, do write.csv(df2, file="somedf.csv")
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Difference between Activity Context and Application Context
...nformation about the current activity that is necessary to complete those calls. If you show the exact error message, might be able to point to what exactly it needs.
But in general, use the activity context unless you have a good reason not to.
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How to test which port MySQL is running on and whether it can be connected to?
I have installed MySQL and even logged in there as a user.
13 Answers
13
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Remove file extension from a file name string
...s file path
– lemon
Oct 2 '15 at 22:01
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This is a better answer as it preserves the path
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Find all storage devices attached to a Linux machine [closed]
I have a need to find all of the writable storage devices attached to a given machine, whether or not they are mounted.
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Can you find all classes in a package using reflection?
Is it possible to find all classes or interfaces in a given package? (Quickly looking at e.g. Package , it would seem like no.)
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sass --watch with automatic minify?
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All of the output styles are listed here (nested, expanded, compact, and compressed)
– allicarn
Aug 20 '13 at 14:59
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How to close this ssh tunnel? [closed]
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passphrases, but the user wants it in the background.
Essentially, send ssh to background once you've entered any passwords to establish the connection; it gives the shell prompt back to you at localhost rather than logging you in to remote-host.
user@mysql-server.com: the remote serv...