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Which is the correct shorthand - “regex” or “regexp” [closed]
...mmers are pretty obsessed about correct terminology. I certainly am, especially because sometimes changing just one character in a word can drastically change its meaning.
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Getting and removing the first character of a string
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x <- 'hello stackoverflow'
substring(x, 2, nchar(x))
Idea is select all characters starting from 2 to number of characters in x. This is important when you have unequal number of characters in word or phrase.
Selecting the first letter is trivial as previous answers:
substring(x,1,1)
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HTML / CSS How to add image icon to input type=“button”?
...right>;
padding-<left|right>: <width of image>px;
It's usually a little easier to use a button with an img inside:
<button type="submit"><img> Text</button>
However the browser implementations of button for submitting are inconsistent, as well as the fact that a...
What is the most efficient way to create a dictionary of two pandas Dataframe columns?
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I found a faster way to solve the problem, at least on realistically large datasets using:
df.set_index(KEY).to_dict()[VALUE]
Proof on 50,000 rows:
df = pd.DataFrame(np.random.randint(32, 120, 100000).reshape(50000,2),columns=list('AB'))
df['A'] = df['A'].apply(chr)
%timeit dict(zip(df...
How to invoke a Linux shell command from Java
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Thank you. This worked. Actually I used "sh" instead of "csh".
– Farshid
Jun 2 '12 at 11:12
5
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Operator overloading : member function vs. non-member function?
...use it can have only one parameter and the other parameter passed automatically is the this pointer. So no standard exists to compare them. On the other hand, overloaded operator declared as a friend is symmetric because we pass two arguments of the same type and hence, they can be compared.
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Do we still need end slashes in HTML5?
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@FreeRadical is correct. This answer is technically incorrect, because it confuses an ending slash with an end tag, and thus misunderstands the spec paragraphs that it quotes. This leads to @YannisDran's confusion. @minitech correctly states what is true.
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Static fields on a null reference in Java
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@JonofAllTrades I think this is obvious: it is reasonable to not throw any exceptions when calling on a null reference because it doesn't matter since the method is static.
– Malcolm
Jul 20 '1...
How do I auto-submit an upload form when a file is selected?
I have a simple file upload form. How do I make it submit automatically when a file has been selected? I don't want the user to have to click the Submit button.
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How to delete the contents of a folder?
...se an other filter in you path, for example : /YOU/PATH/*.txt for removing all text files in a directory.
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