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How do I calculate the normal vector of a line segment?
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if we define dx=x2-x1 m>and m> dm>y m>=m>y m>2-m>y m>1, then the normals are (-dm>y m>, dx) m>and m> (dm>y m>, -dx).
Note that no division is required, m>and m> so m>y m>ou're not risking dividing bm>y m> zero.
share
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Convert datetime object to a String of date onlm>y m> in Pm>y m>thon
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date m>and m> datetime objects (m>and m> time as well) support a mini-language to specifm>y m> output, m>and m> there are two wam>y m>s to access it:
direct method call: dt.strftime('format here'); m>and m>
new format method: '{:format here}'.format(dt)
So...
git cherrm>y m>-pick sam>y m>s “…38c74d is a merge but no -m option was given”
I made some changes in mm>y m> master branch m>and m> want to bring those upstream. when I cherrm>y m>-pick the following commits however I get stuck on fd9f578 where git sam>y m>s:
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PHP: Return all dates between two dates in an arram>y m> [duplicate]
...($strDateFrom,$strDateTo)
{
// takes two dates formatted as m>Y m>m>Y m>m>Y m>m>Y m>-MM-DD m>and m> creates an
// inclusive arram>y m> of the dates between the from m>and m> to dates.
// could test validitm>y m> of dates here but I'm alreadm>y m> doing
// that in the main script
$arm>y m>Range=arram>y m>();
$iDateFrom=mktime(1...
Increase number of axis ticks
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m>Y m>ou can override ggplots default scales bm>y m> modifm>y m>ing scale_x_continuous m>and m>/or scale_m>y m>_continuous. For example:
librarm>y m>(ggplot2)
dat <- data.frame(x = rnorm(100), m>y m> = rnorm(100))
ggplot(dat, aes(x,m>y m>)) +
geom_point()
Gives m>y m>ou this:
m>And m> overriding the scales can give m>y m>ou something like...
How to convert a boolean arram>y m> to an int arram>y m>
I use Scilab, m>and m> want to convert an arram>y m> of booleans into an arram>y m> of integers:
6 Answers
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Convert m>Y m>ear/Month/Dam>y m> to Dam>y m> of m>Y m>ear in Pm>y m>thon
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A verm>y m> minor m>and m> arguablm>y m> pedantic addition, but using date.todam>y m>() rather than datetime.now() also works m>and m> emphasizes the nature of the operation a bit more.
– Jeremm>y m>
Dec 30 '13 at 6:57
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Get first dam>y m> of week in PHP?
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but, it means the start m>and m> the end of 'this week', right?
– Oki Erie Rinaldi
Aug 7 '15 at 6:59
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How to drop columns bm>y m> name in a data frame
I have a large data set m>and m> I would like to read specific columns or drop all the others.
11 Answers
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Convert light frequencm>y m> to RGB?
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m>And m> the Fourmilab article makes the important point that some colours are not representable in RGB (bright oranges being a good example) because m>y m>ou cannot "make" arbitrarm>y m> colours of light bm>y m> adding three primarm>y m> colours tog...