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Algorithm to calculate the number of divisors of a given number
...ms in the list instead of returning them however.
Here's a Dr. Math that explains what exactly it is you need to do mathematically.
Essentially it boils down to if your number n is:
n = a^x * b^y * c^z
(where a, b, and c are n's prime divisors and x, y, and z are the number of times that divisor ...
How to index characters in a Golang string?
... be printed as characters instead of numbers, you need to use Printf("%c", x). The %c format specification works for any integer type.
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Reorder levels of a factor without changing order of values
.... But this works: reorder(df$letters, seq(4,1))
– Alex Holcombe
Aug 29 '15 at 22:05
1
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Group by in LINQ
... select new { PersonId = g.Key, Cars = g.ToList() };
Or as a non-query expression:
var results = persons.GroupBy(
p => p.PersonId,
p => p.car,
(key, g) => new { PersonId = key, Cars = g.ToList() });
Basically the contents of the group (when viewed as an IEnumerable<T&g...
Coffeescript — How to create a self-initiating anonymous function?
...most common use of do is capturing variables in a loop. For instance,
for x in [1..3]
do (x) ->
setTimeout (-> console.log x), 1
Without the do, you'd just be printing the value of x after the loop 3 times.
sh...
Android Center text on canvas
I'm trying to display a text using the code below.
The problem is that the text is not centered horizontally.
When I set the coordinates for drawText , it sets the bottom of the text at this position. I would like the text to be drawn so that the text is centered also horizontally.
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Join a list of items with different types as string in Python
...d only convert the integers to strings when you need to display them. For example, if you have a list of integers then you can convert them one by one in a for-loop and join them with ,:
print(','.join(str(x) for x in list_of_ints))
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How to store a command in a variable in a shell script?
...
Use eval:
x="ls | wc"
eval "$x"
y=$(eval "$x")
echo "$y"
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Scala Doubles, and Precision
...nance can require rounding and also performance.
– Rex Kerr
Jun 19 '12 at 20:33
28
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Change all files and folders permissions of a directory to 644/755
...change all files to 644 and all folders to 755 using chmod from the linux command prompt? (Terminal)
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