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Drop rows with all zeros in pandas data frame
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12 Answers
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How exactly does tail recursion work?
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169
The compiler is simply able to transform this
int fac_times (int n, int acc) {
if (n == 0...
How do I compare version numbers in Python?
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10 Answers
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Determine the data types of a data frame's columns
...se ?str(). To explore some examples, let's make some data:
set.seed(3221) # this makes the example exactly reproducible
my.data <- data.frame(y=rnorm(5),
x1=c(1:5),
x2=c(TRUE, TRUE, FALSE, FALSE, FALSE),
X3=letters[1:5])
@...
Format number to always show 2 decimal places
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1197
(Math.round(num * 100) / 100).toFixed(2);
Live Demo
var num1 = "1";
document.getEleme...
How to split a column into two columns?
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11 Answers
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Generate a random number in the range 1 - 10
...here a way to tell pg's random() function to get me only numbers between 1 and 10?
7 Answers
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Numpy: Divide each row by a vector element
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187
Here you go. You just need to use None (or alternatively np.newaxis) combined with broadcastin...
xkcd style graphs in MATLAB
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119
I see two ways to solve this: The first way is to add some jitter to the x/y coordinates of th...
Does the ternary operator exist in R?
... returns the latest evaluation, if-else is equivalent to ?:.
> a <- 1
> x <- if(a==1) 1 else 2
> x
[1] 1
> x <- if(a==2) 1 else 2
> x
[1] 2
The power of R is vectorization. The vectorization of the ternary operator is ifelse:
> a <- c(1, 2, 1)
> x <- ifelse(a=...