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How do you convert a byte array to a hexadecimal string, and vice versa?
...mberChars; i += 2)
bytes[i / 2] = Convert.ToByte(hex.Substring(i, 2), 16);
return bytes;
}
Using Substring is the best option in combination with Convert.ToByte. See this answer for more information. If you need better performance, you must avoid Convert.ToByte before you can drop SubStrin...
Which is faster: while(1) or while(2)?
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681
Both loops are infinite, but we can see which one takes more instructions/resources per iterat...
Long-lasting FB access-token for server to pull FB page info
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Elad Nava
6,21622 gold badges3434 silver badges5757 bronze badges
answered Feb 21 '14 at 7:11
redhotvengeancere...
CSS selector for text input fields?
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685
input[type=text]
or, to restrict to text inputs inside forms
form input[type=text]
or, to...
How to dismiss a Twitter Bootstrap popover by clicking outside?
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466
Update: A slightly more robust solution: http://jsfiddle.net/mattdlockyer/C5GBU/72/
For button...
Getting image dimensions without reading the entire file
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106
Your best bet as always is to find a well tested library. However, you said that is difficult, s...
Can Retrofit with OKHttp use cache data when offline
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6 Answers
6
Active
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How to find the size of localStorage
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226
Execute this snippet in JavaScript console (one line version):
var _lsTotal=0,_xLen,_x;for(_x in...
How to enumerate a range of numbers starting at 1
...
As you already mentioned, this is straightforward to do in Python 2.6 or newer:
enumerate(range(2000, 2005), 1)
Python 2.5 and older do not support the start parameter so instead you could create two range objects and zip them:
r = xrange(2000, 2005)
r2 = xrange(1, len(r) + 1)
h = zip(r2,...
Add new row to dataframe, at specific row-index, not appended?
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existingDF
}
> insertRow(existingDF, newrow, r)
V1 V2 V3 V4
1 1 6 11 16
2 2 7 12 17
3 1 2 3 4
4 3 8 13 18
5 4 9 14 19
6 5 10 15 20
If speed is less important than clarity, then @Simon's solution works well:
existingDF <- rbind(existingDF[1:r,],newrow,existingDF[-(1:r),])
...