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How can I read command line parameters from an R script?
...rgs(TRUE)
Then you can refer to the arguments passed as args[1], args[2] etc.
Then run
Rscript myscript.R arg1 arg2 arg3
If your args are strings with spaces in them, enclose within double quotes.
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Find rows that have the same value on a column in MySQL
...LECT email,
count(*) AS c
FROM TABLE
GROUP BY email
HAVING c > 1
ORDER BY c DESC
If you want the full rows:
select * from table where email in (
select email from table
group by email having count(*) > 1
)
...
Error Code: 2013. Lost connection to MySQL server during query
...
Add the following into /etc/mysql/cnf file:
innodb_buffer_pool_size = 64M
example:
key_buffer = 16M
max_allowed_packet = 16M
thread_stack = 192K
thread_cache_size = 8
innodb_buffer_pool_size = 64M
...
PDOException “could not find driver”
... get it working, you will need to restart your web-server:
Apache: sudo /etc/init.d/apache2 restart
Nginx: sudo /etc/init.d/nginx restart
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Python: Check if one dictionary is a subset of another larger dictionary
...;= d2.items() are actually comparing 2 lists of tuples, without particular order, so the final result will probably not reliable. For this reason, I switch to @blubberdiblub 's answer.
– RayLuo
Feb 17 '17 at 20:43
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SparseArray vs HashMap
...;
sparseArray.put(17, "pig");
Note that the int keys do not need to be in order. This can also be used to change the value at a particular int key.
Remove items
Use remove (or delete) to remove elements from the array.
sparseArray.remove(17); // "pig" removed
The int parameter is the integer key.
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Should I make HTML Anchors with 'name' or 'id'?
...hat has an ID exactly equal to fragid, then the first such element in tree order is the indicated part of the document; stop the algorithm here.
If there is an a element in the DOM that has a name attribute whose value is exactly equal to fragid, then the first such element in tree order is the...
Eclipse Workspaces: What for and why?
...onvenience of auto-complete and the view of your libraries (and docs ) in order to avoid syntax errors to say at least. In no circumstance you would jeopardize this functionality.
– Lazaros Kosmidis
May 7 '16 at 16:05
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Strengths of Shell Scripting compared to Python [closed]
... indispensable. Why do you think there are so many? bash, tcsh, csh, sh, etc., etc.,
Python is a shell. Not the one you'd use for running all commands, but for scripting, it's ideal.
Python is a more-or-less standard part of all Linux distro's.
The more traditional shells do too many things.
...
Tricky Google interview question
...st preserve duplicates coming from both its input sequences. See Data.List.Ordered package for related stuff.
– Will Ness
Apr 16 '12 at 15:37
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