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How to succinctly write a formula with many variables from a data frame?
... <- lm(y ~ . - x3, data = d)
Technically, . means all variables not already mentioned in the formula. For example
lm(y ~ x1 * x2 + ., data = d)
where . would only reference x3 as x1 and x2 are already in the formula.
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Adding div element to body or document in JavaScript
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-1. This is an awful way to achieve this. If you are reading this, do not use this slow and dated solution. Look at the answer by @peter-t
– MacroMan
Jul 17 '17 at 15:50
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How do I preview emails in Rails?
...as in fact exactly the approach I had taken and just coded as I started to read your answer - thank you :)
– Peter Nixey
Aug 24 '11 at 13:27
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How to trigger event in JavaScript?
... @AngelPolitis: Because it was written after the previous one was already accepted and the person who wrote the question (@KoolKabin) probably didn't re-read the answers
– Dorian
Jul 16 '16 at 13:24
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Pointer arithmetic for void pointer in C
...who came to this question came to the wrong conclusion because they didn't read to the bottom of the answer. I've edited this to make it more obvious.
– Dietrich Epp
May 11 '13 at 2:37
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Create a .txt file if doesn't exist, and if it does append a new line
I would like to create a .txt file and write to it, and if the file already exists I just want to append some more lines:
1...
Find all records which have a count of an association greater than zero
... No, @KeithMattix, it should not be. It can be, however, if it reads better to you; it's a matter of preference. The count can be done with any field in the join table that is guaranteed to have a value in every row. Most meaningful candidates are projects.id, project_id, and vacancies.i...
Set UILabel line spacing
...h 'heading', and comes from the lead metal used decades ago). Leading is a read-only property of UIFont, which was deprecated in 4.0 and replaced by lineHeight. As far as I know, there's no way to create a font with a specific set of parameters such as lineHeight; you get the system fonts and any cu...
Split files using tar, gz, zip, or bzip2 [closed]
...y /b file1 + file2 + etc.. on Windows, then copy back to Linux and tar can read the reassembled tarball. I just tried it.
– Brian
Mar 13 '14 at 15:58
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How to replace list item in best way
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You could make it more readable and more efficient:
string oldValue = valueFieldValue.ToString();
string newValue = value.ToString();
int index = listofelements.IndexOf(oldValue);
if(index != -1)
listofelements[index] = newValue;
This asks o...