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C++ SFINAE examples?
...st has not too many elements.
The syntax char(*)[C] means: Pointer to an array with element type char and size C. If C is false (0 here), then we get the invalid type char(*)[0], pointer to a zero sized array: SFINAE makes it so that the template will be ignored then.
Expressed with boost::enabl...
A generic list of anonymous class
...
@DHornpout: That would give an array, not a List<T>.
– Jon Skeet
Mar 4 '09 at 22:47
1
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Extract a substring from a string in Ruby using a regular expression
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String1.scan(/<([^>]*)>/).last.first
scan creates an array which, for each <item> in String1 contains the text between the < and the > in a one-element array (because when used with a regex containing capturing groups, scan creates an array containing the captures f...
How to get the last char of a string in PHP?
...nce code with these results:
substr() took 7.0334868431091seconds
array access took 2.3111131191254seconds
Direct string access (negative string offsets) took 1.7971360683441seconds
share
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How do I insert NULL values using PDO?
..., PDO has some (to me) unexpected behaviour.
If you use $stmt->execute(Array), you have to specify the literal NULL and cannot give NULL by variable reference.
So this won't work:
// $val is sometimes null, but sometimes an integer
$stmt->execute(array(
':param' => $val
));
// will ca...
How to list all methods for an object in Ruby?
...
Module#instance_methods
Returns an array containing the names of the public and protected instance methods in the receiver. For a module, these are the public and protected methods; for a class, they are the instance (not singleton) methods. With no argument, ...
Is there a library function for Root mean square error (RMSE) in python?
... return np.sqrt(((predictions - targets) ** 2).mean())
rmse_val = rmse(np.array(d), np.array(p))
print("rms error is: " + str(rmse_val))
Which prints:
d is: ['0.00000000', '0.16600000', '0.33300000']
p is: ['0.00000000', '0.25400000', '0.99800000']
rms error between lists d and p is: 0.387284994...
Creating multiline strings in JavaScript
...o keep oversight with complex or long multiline strings I sometimes use an array pattern:
var myString =
['<div id="someId">',
'some content<br />',
'<a href="#someRef">someRefTxt</a>',
'</div>'
].join('\n');
or the pattern anonymous already showed...
Appending the same string to a list of strings in Python
...lue='@',shape=len(lst1),dtype=object) #optional third list
result = np.array(lst1,dtype=object)+at+np.array(lst2,dtype=object)
Result:
array(['a@1', 'b@2', 'c@3', 'd@4', 'e@5'], dtype=object)
dtype odject may be further converted str
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Learn C first before learning Objective-C [closed]
...t of graphs. For storing the data necessary to paint the graphs, we used NSArray's. Actually NSMutableArray's, since the graph was animated. Result: Very slow graph animation. We replaced all NSArray's with normal C arrays, objects with structs (after all graph coordinate information is nothing you ...