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What is the Scala annotation to ensure a tail recursive function is optimized?
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From the "Tail calls, @tailrec and trampolines" blog post:
In Scala 2.8, you will also be able to use the new @tailrec annotation to get information about which methods are optimised.
This annotation lets you mark specific methods that you hope th...
how to set textbox value in jquery
...ed from the Ajax into the specified element:
Load data from the server and place the returned HTML into the matched element.
You cannot set the value of a textbox with that method.
$(selector).load() returns the a jQuery object. By default an object is converted to [object Object] when treated...
How to return an array from JNI to Java?
I am attempting to use the android NDK.
4 Answers
4
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Left-pad printf with spaces
...nt exactly 40 spaces then some text, just save the 40 spaces in a constant and print them. If you need to print multiple lines, either use multiple printf statements like the one above, or do it in a loop, changing the value of ptr each time.
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Matplotlib (pyplot) savefig outputs blank image
...ould adjust the values I pass to plt.subplot(); maybe try values 131, 132, and 133, or values that depend whether or not T0 exists.
Second, after plt.show() is called, a new figure is created. To deal with this, you can
Call plt.savefig('tessstttyyy.png', dpi=100) before you call plt.show()
Save ...
Is it possible to include a file in your .gitconfig
...th = /path/to/file
See here for a detailed description of the git change and its edge cases.
By the way, a couple of subtleties worth pointing out:
Environment-variable expansion, e.g. $HOME, is not supported. (Expansion of ~ appeared in Git 1.7.10.2.)
If a relative path is specified, then it i...
How to write a cron that will run a script every day at midnight?
I have heard crontab is a good choice, but how do I write the line and where do I put it on the server?
6 Answers
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How to load/edit/run/save text files (.py) into an IPython notebook cell?
... individual cells of an open IPython notebook so that they can edited, run and then saved. Can this be done?
4 Answers
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PostgreSQL return result set as JSON array?
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TL;DR
SELECT json_agg(t) FROM t
for a JSON array of objects, and
SELECT
json_build_object(
'a', json_agg(t.a),
'b', json_agg(t.b)
)
FROM t
for a JSON object of arrays.
List of objects
This section describes how to generate a JSON array of objects, with eac...
A migration to add unique constraint to a combination of columns
...mns. i.e. for a people table, a combination of first_name , last_Name and Dob should be unique.
6 Answers
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