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Where can I learn how to write C code to speed up slow R functions? [closed]
...for learning how to write C code for use with R? I know about the system and foreign language interfaces section of R extensions, but I find it pretty hard going. What are good resources (both online and offline) for writing C code for use with R?
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HashSet vs. List performance
...be better off using a List<T>.
I did a test for this on my machine, and, well, it has to be very very small to get an advantage from List<T>. For a list of short strings, the advantage went away after size 5, for objects after size 20.
1 item LIST strs time: 617ms
1 item HASHSET strs t...
Getting the last element of a list
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some_list[-1] is the shortest and most Pythonic.
In fact, you can do much more with this syntax. The some_list[-n] syntax gets the nth-to-last element. So some_list[-1] gets the last element, some_list[-2] gets the second to last, etc, all the way down t...
Rails: How to get the model class name based on the controller class name?
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If your controller and model are in the same namespace, then what you want is
controller_path.classify
controller_path gives you the namespace; controller_name doesn't.
For example, if your controller is
Admin::RolesController
then:
con...
Laravel orderBy on a relationship
...ed this, it doesn't work. Here's my case : I have two table (appointments and schedules), the query is simple : get appointments order by schedules.datetime descending. I have solution by adding new column in table appointments to store datetime from table schedules. And now I only need to order by...
How can I get the length of text entered in a textbox using jQuery?
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For me its not text box its a span tag and this worked for me.
var len = $("span").text().length;
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Store print_r result into a variable as a string or text
... displayed,
To save the data , so a simple thing, just declare a variable and assign the data to it..
for example you are printing some array like this..
print_r(myArray);
to save this, you just have to add an option , set Return to TRUE and assign it to a variable
$myVariable=print_r(myArray...
AWS S3: how do I see how much disk space is using
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AWS Cloudwatch now has a metric for bucket size and number of objects that is updated daily. About time! aws.amazon.com/blogs/aws/…
– cudds
Jul 28 '15 at 23:13
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How to remove unreferenced blobs from my git repo
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... and without further ado, may I present to you this useful command, "git-gc-all", guaranteed to remove all your git garbage until they might come up extra config variables:
git -c gc.reflogExpire=0 -c gc.reflogExpireUnreachab...
Interpolating a string into a regex
...o}/
then the periods in your match text are treated as regexp wildcards, and "0.0.0.0" will match "0a0b0c0".
Note also that if you really just want to check for a substring match, you can simply do
if goo.include?(foo)
which doesn't require an additional quoting or worrying about special chara...