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How to pass optional arguments to a method in C++?
...e of passing mode as optional parameter
void myfunc(int blah, int mode = 0)
{
if (mode == 0)
do_something();
else
do_something_else();
}
you can call myfunc in both ways and both are valid
myfunc(10); // Mode will be set to default 0
myfunc(10, 1); // Mode will be ...
Is there a way to measure how sorted a list is?
...onsider the example sequence 9, 5, 7, 6. This sequence has the inversions (0,1), (0,2), (0,3), (2,3) and the inversion number 4.
If you want a value between 0 and 1, you can divide the inversion number by N choose 2.
To actually create an algorithm to compute this score for how sorted a list is, you...
Group by multiple columns in dplyr, using string vector input
...
data = data.frame(
asihckhdoydkhxiydfgfTgdsx = sample(LETTERS[1:3], 100, replace=TRUE),
a30mvxigxkghc5cdsvxvyv0ja = sample(LETTERS[1:3], 100, replace=TRUE),
value = rnorm(100)
)
# get the columns we want to average within
columns = names(data)[-3]
library(dplyr)
df1 <- data %>%...
CGContextDrawImage draws image upside down when passed UIImage.CGImage
...
Instead of
CGContextDrawImage(context, CGRectMake(0, 0, 145, 15), image.CGImage);
Use
[image drawInRect:CGRectMake(0, 0, 145, 15)];
In the middle of your begin/end CGcontext methods.
This will draw the image with the correct orientation into your current image context...
MySQL root access from all hosts
...t way is to comment out the line in your my.cnf file:
#bind-address = 127.0.0.1
and restart mysql
service mysql restart
By default it binds only to localhost, but if you comment the line it binds to all interfaces it finds. Commenting out the line is equivalent to bind-address=*.
To check wh...
How to find the sum of an array of numbers
... how can I find the sum of its elements? (In this case, the sum would be 10 .)
43 Answers
...
Is there an expression for an infinite generator?
...gument iter = zero-argument callable + sentinel value
int() always returns 0
Therefore, iter(int, 1) is an infinite iterator. There are obviously a huge number of variations on this particular theme (especially once you add lambda into the mix). One variant of particular note is iter(f, object()),...
Changing font size and direction of axes text in ggplot2
...
301
Use theme():
d <- data.frame(x=gl(10, 1, 10, labels=paste("long text label ", letters[1:10]...
Drawable image on a canvas
...|
edited Dec 15 '18 at 12:07
answered Apr 8 '14 at 8:36
Gá...
Java optional parameters
...
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edited May 20 '11 at 10:27
WarFox
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