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When converting a project to use ARC what does “switch case is in protected scope” mean?
...t fixed the compile problem:
NSDate *from; /* <----------- */
switch (index) {
....
case 2:
from = [NSDate dateWithTimeIntervalSince1970:1388552400];
[self refreshContents:from toDate:[NSDate date]];
break;
}
...
Drop columns whose name contains a specific string from pandas DataFrame
....contains
In recent versions of pandas, you can use string methods on the index and columns. Here, str.startswith seems like a good fit.
To remove all columns starting with a given substring:
df.columns.str.startswith('Test')
# array([ True, False, False, False])
df.loc[:,~df.columns.str.startsw...
Using Java with Nvidia GPUs (CUDA)
...nslated into OpenCL kernels.
Language extensions
http://www.ateji.com/px/index.html : A language extension for Java that allows parallel constructs (e.g. parallel for loops, OpenMP style) which are then executed on the GPU with OpenCL. Unfortunately, this very promising project is no longer mainta...
How many characters can a Java String have?
...o 2^31-1 characters, as they are held by an internal array, and arrays are indexed by integers in Java.
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Only variables should be passed by reference
...
Just as you can't index the array immediately, you can't call end on it either. Assign it to a variable first, then call end.
$basenameAndExtension = explode('.', $file_name);
$ext = end($basenameAndExtension);
...
Opacity of background-color, but not the text [duplicate]
...}
div::before
{
content: "";
display: block;
position: absolute;
z-index: -1;
width: 100%;
height: 100%;
background:red;
opacity: .2;
}
Demo at http://jsfiddle.net/KVyFH/172/
It will work on any modern browser
...
When does a process get SIGABRT (signal 6)?
...
In my case, it was due to an input in an array at an index equal to the length of the array.
string x[5];
for(int i=1; i<=5; i++){
cin>>x[i];
}
x[5] is being accessed which is not present.
...
How do I find duplicate values in a table in Oracle?
..._NAME
AND ROWID < A.ROWID
)
Works fine (quick enough) when there is index on column_name. And it's better way to delete or update duplicate rows.
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MySQL select where column is not empty
...nd another plus over the COALESCE() and IFNULL() functions is that this is index friendly, since you're not comparing the output of a function on a field to anything.
Test cases:
SELECT if(NULL > '','true','false');-- false
SELECT if('' > '','true','false');-- false
SELECT if(' ' > '','tr...
How to get the filename without the extension from a path in Python?
...elp deal with the multiple dots problem. The answer below about using the index will not work if the path is './foo.tar.gz'
– William Allcock
Feb 12 at 22:51
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