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What is a regular expression for a MAC Address?
... The second will incorrectly match strings which contain non-hex characters such as g.
– Binary Phile
Feb 25 '15 at 15:32
...
How to split data into training/testing sets using sample function
...101) # Set Seed so that same sample can be reproduced in future also
# Now Selecting 75% of data as sample from total 'n' rows of the data
sample <- sample.int(n = nrow(data), size = floor(.75*nrow(data)), replace = F)
train <- data[sample, ]
test <- data[-sample, ]
By using caTools pa...
Compare two files line by line and generate the difference in another file
... That does not do the job requested; it inserts a bunch of extra characters, even with the use of commandline switches suggested in other answers.
– xenocyon
Jan 26 '16 at 22:25
...
Insert picture/table in R Markdown [closed]
...explained fully here. Again, this function is intelligent in automatically selecting the correct formatting for the output selected.
```{r table}
knitr::kable(mtcars[1:5,, 1:5], caption = "A table caption")
```
If you want to make your own simple tables in R Markdown and are using R Studio, you c...
MySQL - Get row number on select
Can I run a select statement and get the row number if the items are sorted?
5 Answers
...
CSS triangle custom border color
...areful about copypasta out of JSFiddle, it added two invisible and invalid characters into my CSS file that caused validation/parse errors in that css file. Once I removed the invisible characters (the chars were zero width, so cursor wasn't showing them, but I was able to backspace) it worked wonde...
Regex: matching up to the first occurrence of a character
...pattern that matches everything until the first occurrence of a specific character, say a ";" - a semicolon .
13 Answers...
What is simplest way to read a file into String? [duplicate]
...one call to next().
There is a constructor that takes a File and a String charSetName (among many other overloads). These two constructor may throw FileNotFoundException, but like all Scanner methods, no IOException can be thrown beyond these constructors.
You can query the Scanner itself through ...
Check if an element is present in an array [duplicate]
...
!==-1 [extra chars]
– Francisc
Aug 7 '13 at 12:22
3
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Drawing an image from a data URL to a canvas
...
in javascript , using jquery for canvas id selection :
var Canvas2 = $("#canvas2")[0];
var Context2 = Canvas2.getContext("2d");
var image = new Image();
image.src = "images/eye.jpg";
Context2.drawImage(image, 0, 0);
html5:
<canv...