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Difference between array_map, array_walk and array_filter
...ray_filter . What I could see from documentation is that you could pass a callback function to perform an action on the supplied array. But I don't seem to find any particular difference between them.
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Call apply-like function on each row of dataframe with multiple arguments from each row
...ataframe with multiple columns. For each row in the dataframe, I want to call a function on the row, and the input of the function is using multiple columns from that row. For example, let's say I have this data and this testFunc which accepts two args:
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How to reorder data.table columns (without copying)
... 2 2
# [3,] 0.3297416 1 3
From ?setcolorder:
In data.table parlance, all set* functions change their input by reference. That is, no copy is made at all, other than temporary working memory, which is as large as one column.
so should be pretty efficient. See ?setcolorder for details.
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Operator precedence with Javascript Ternary operator
...it also leaves a blank space at the beginning of the string if it was initially empty. I believe the point of the ternary operation is to produce a clean-looking string.
– JMTyler
Jun 21 '11 at 22:15
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What is “with (nolock)” in SQL Server?
...ly write new rows, you never update them.
– Jonathan Allen
Mar 26 '09 at 17:56
49
@Grauenwolf- An...
UITableViewCell show white background and cannot be modified on iOS7
...ull said, "...there seems to be a bug in interface builder...", I'm not totally sure whether it does have the bug, but seems so cause his comment got several up votes. So there might something wrong if you use IB. :)
share
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Designing function f(f(n)) == -n
...turn n - 1
else:
return -1 * (n + 1)
Python automatically promotes integers to arbitrary length longs. In other languages the largest positive integer will overflow, so it will work for all integers except that one.
To make it work for real numbers you need to replace the n ...
Visual Studio opens the default browser instead of Internet Explorer
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For MVC2+ I just add a .htm file, usually named Starter.htm and the upper solution works fine. I usually also just add it to the solution instead of a project. It makes more sense that way for especially if I have a multi-web-project solution. Oh and you don't h...
Disable time in bootstrap date time picker
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I tried all of the solutions posted here but none of them worked for me. I managed to disable the time by using this line of code in my jQuery:
$('#datetimepicker4').datetimepicker({
format: 'YYYY-MM-DD'
});
This set the forma...
How do you access a website running on localhost from iPhone browser
...ever port your website is running on) in the inbound security of your firewall if you are running one.
Note: don't forget the app's port if what you want is to debug the app in
your iPhone's browser like: http://192.168.0.102:3000. In this example 3000 is the default port used by ReactJS.
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