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How do I use NSTimer?
... can be done something like this:
[NSTimer scheduledTimerWithTimeInterval:2.0
target:self
selector:@selector(targetMethod:)
userInfo:nil
repeats:NO];
This will create a timer that is fired after 2.0 seconds and calls targetMethod: on self with one argument, which is a pointer to t...
break out of if and foreach
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624
if is not a loop structure, so you cannot "break out of it".
You can, however, break out of the...
How to create PDF files in Python [closed]
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drevicko
12.1k1111 gold badges6060 silver badges8484 bronze badges
answered Feb 12 '10 at 15:16
GeoGeo
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How to get different colored lines for different plots in a single figure?
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432
Matplotlib does this by default.
E.g.:
import matplotlib.pyplot as plt
import numpy as np
x =...
What does value & 0xff do in Java?
... a long. But not on byte. See the Java Language Specification, sections 15.22.1 and 5.6.2.
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Getting image dimensions without reading the entire file
...unc<BinaryReader, Size>>()
{
{ new byte[]{ 0x42, 0x4D }, DecodeBitmap},
{ new byte[]{ 0x47, 0x49, 0x46, 0x38, 0x37, 0x61 }, DecodeGif },
{ new byte[]{ 0x47, 0x49, 0x46, 0x38, 0x39, 0x61 }, DecodeGif },
{ new byte[]{ 0x89, 0x50, 0x4E, 0...
Removing X-Powered-By
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238
I think that is controlled by the expose_php setting in PHP.ini:
expose_php = off
Decide...
JavaScript by reference vs. by value [duplicate]
...e.log(x, y, z.first); // 4, ["eeny", "miny", "mo", "foo"], false
Example 2:
var a = ["1", "2", {foo:"bar"}];
var b = a[1]; // b is now "2";
var c = a[2]; // c now references {foo:"bar"}
a[1] = "4"; // a is now ["1", "4", {foo:"bar"}]; b still has the value
// it had at the time of...
Linux command: How to 'find' only text files?
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answered Dec 1 '12 at 13:27
crudcorecrudcore
2,63522 gold badges1515 silver badges1010 bronze badges
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To find whether a column exists in data frame or not
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202
Assuming that the name of your data frame is dat and that your column name to check is "d", yo...