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Update a column value, replacing part of a string
...ensures that you're only replacing parts of strings that begin with http://etc/etc/ or string_to_be_replaced. For example, in the given answer, http://domain1.com/images/this/is/a/test would be affected, but foobar/http://domain1.com/images/ would not.
– Kyle Challis
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How Do I Choose Between a Hash Table and a Trie (Prefix Tree)?
...ickly look up prefixes of keys, enumerate all entries with a given prefix, etc.
Advantages of linked structure:
If there are many common prefixes, the space they require is shared.
Immutable tries can share structure. Instead of updating a trie in place, you can build a new one that's different ...
How to permanently add a private key with ssh-add on Ubuntu? [closed]
...If you want all users on the computer to use the key put these lines into /etc/ssh/ssh_config and the key in a folder accessible to all.
Additionally if you want to set the key specific to one host, you can do the following in your ~/.ssh/config :
Host github.com
User git
IdentityFile ~/.s...
Simple and fast method to compare images for similarity
...hreshold. It is also very sensitive to color changes (brightness, contrast etc.). You can combine it with the previous two.
Detectors of salient points/areas - such as MSER (Maximally Stable Extremal Regions), SURF or SIFT. These are very robust algorithms and they might be too complicated for your ...
How do I iterate through each element in an n-dimensional matrix in MATLAB?
...eral to any array in matlab. So you can use it on structures, cell arrays, etc. The only problem with the linear index is when they get too large. MATLAB uses a 32 bit integer to store these indexes. So if your array has more then a total of 2^32 elements in it, the linear index will fail. It is rea...
How to run a shell script in OS X by double-clicking?
...w may need to be changed to tab if that is your terminal default behavior, etc.).
– l'L'l
Jan 13 '16 at 1:12
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How to place two divs next to each other?
...ng issue: since divs are made inline you have to keep no spaces, new lines etc between them in your HTML. Otherwise, browsers will render a space between them. See this Fiddle: you can't manage to keep both divs on the same line unless you put theirs tags without anything in between.
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Why does the order of the loops affect performance when iterating over a 2D array?
...2]
x[0][3]
x[1][0] etc...
Meaning that you're hitting them all in order. Now look at the 1st version. You're doing:
x[0][0]
x[1][0]
x[2][0]
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Method can be made static, but should it?
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Performance, namespace pollution etc are all secondary in my view. Ask yourself what is logical. Is the method logically operating on an instance of the type, or is it related to the type itself? If it's the latter, make it a static method. Only move it into...
Workflow for statistical analysis and report writing
...nction. It's completely self-contained, including all the analysis, data, etc. And you can version control the whole file.
I use the StatET plugin for Eclipse for developing the reports, and Sweave is integrated (Eclipse recognizes latex formating, etc). On Windows, it's easy to use MikTEX.
I w...