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Combine two or more columns in a dataframe into a new column with a new name
... already mentioned in comments by Uwe and UseR, a general solution in the tidyverse format would be to use the command unite:
library(tidyverse)
n = c(2, 3, 5)
s = c("aa", "bb", "cc")
b = c(TRUE, FALSE, TRUE)
df = data.frame(n, s, b) %>%
unite(x, c(n, s), sep = " ", remove = FALSE)
...
Video auto play is not working in Safari and Chrome desktop browser
I spent quite a lot of time trying to figure out why video embedded like here:
21 Answers
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jQuery - select all text from a textarea
How can I make it so when you click inside a textarea, its entire content gets selected?
6 Answers
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How can I kill a process by name instead of PID?
...
A bit longer alternative:
kill `pidof firefox`
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Brew doctor says: “Warning: /usr/local/include isn't writable.”
... @WillemLabu one less process fork? whoami is effective user id and as the man page says is obsolete :) bash is default shell on OSX and somewhere USER is getting set.
– jrwren
Mar 5 '14 at 18:54
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Visual Studio debugger - Displaying integer values in Hex
...d also in the immediate window. I guess I must have hit a shortcut key accidently or something.
7 Answers
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How to replace a string in a SQL Server Table Column
... edited Nov 12 '14 at 19:47
qualidafial
5,78622 gold badges2424 silver badges3434 bronze badges
answered May 2 '09 at 9:45
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Cannot use a CONTAINS or FREETEXT predicate on table or indexed view because it is not full-text ind
...escription(Description)
key index PK_ProductDescription_ProductDescriptionID
Before you create the index, make sure:
- you don't already have full-text search index on the table as only one full-text search index allowed on a table
- a unique index exists on the table. The index must be...
How to sort a collection by date in MongoDB?
...back. Whatever you want to do with the query result, you put that logic inside your callback. You can read more on what callbacks are and how they work to learn event based programming.
– Sushant Gupta
Nov 17 '15 at 14:20
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req.body empty on posts
...ntent type select "X-www-form-urlencoded" and it should work.
Also to get rid of error message replace:
app.use(bodyParser.urlencoded())
With:
app.use(bodyParser.urlencoded({
extended: true
}));
See https://github.com/expressjs/body-parser
The 'body-parser' middleware only handles JSON and urlen...