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When is CRC more appropriate to use than MD5/SHA1?
...from network interference, line noise, distortion, etc.
CRC is computationally much less complex than MD5 or SHA1. Using a hash function like MD5 is probably overkill for random error detection. However, using CRC for any kind of security check would be much less secure than a more complex hashing ...
Stop Excel from automatically converting certain text values to dates
...string literal is the content of the string. Thus the quotation marks magically disappear. You can put =1+2+3 and get the value 6 after CSV import. The formula itself is not destroyed in the import process.
– lokori
Oct 8 '14 at 13:16
...
Undo part of unstaged changes in git
...ts you choose individual hunks from the diff between your working copy and index to revert. Likewise, git add -p allows you to choose hunks to add to the index, and git reset -p allows you to choose individual hunks from the diff between the index and HEAD to back out of the index.
$ git checkout -...
When should I use the HashSet type?
...id Clear();
bool Contains(T item);
void CopyTo(T[] array, int arrayIndex);
bool Remove(T item);
// Properties
int Count { get; }
bool IsReadOnly { get; }
}
A List<T> implements IList<T>, which extends the ICollection<T>
public interface IList<T> : IC...
Convert light frequency to RGB?
..._MAX)
return new byte[3];
len -= LEN_MIN;
var index = (int)Math.Floor(len / LEN_STEP);
var offset = len - LEN_STEP * index;
var x = Interpolate(X, index, offset);
var y = Interpolate(Y, index, offset);
var z = Interpolate(Z, index, offset...
Is Python strongly typed?
... takes a string and an int, when there are obviously other functions, like indexing, that do?
* Actually, in modern Python, that can be explained in terms of OO subtyping, since isinstance(2, numbers.Real) is true. I don't think there's any sense in which 2 is an instance of the string type in Perl...
How to style SVG with external CSS?
... want them to have different fill colors, this won't work, but if you want all your paths to be the same, this should work.
In your html file, you want something like this:
<style>
.fill-red { fill: red; }
.fill-blue { fill: blue; }
</style>
<a href="//www.example.com/">
&...
Creating a blurring overlay view
...e blur as the background of the view: view.insertSubview(blurEffectView, atIndex: 0)
– Michael Voccola
Apr 6 '15 at 22:52
2
...
What is the easiest way to push an element to the beginning of the array?
...1,2,3]
a.insert(0,'x')
=> ['x',1,2,3]
Where the first argument is the index to insert at and the second is the value.
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Adding a column to a data.frame
..." section of the relevant help text, [[.data.frame.
Data frames can be indexed in several modes. When [ and [[ are used with a single vector index (x[i] or x[[i]]), they index the data frame as if it were a list.
my.dataframe["new.col"] <- a.vector
my.dataframe[["new.col"]] <- a.vector
...