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Convert data.frame column to a vector?
I have a dataframe such as:
11 Answers
11
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Convert DataFrame column type from string to datetime, dd/mm/yyyy format
How can I convert a DataFrame column of strings (in dd/mm/yyyy format) to datetimes?
4 Answers
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twig: IF with multiple conditions
... Does the left expression equal the right expression?
+ Convert both arguments into a number and add them.
- Convert both arguments into a number and substract them.
* Convert both arguments into a number and multiply them.
/ Convert both arguments in...
RE error: illegal byte sequence on Mac OS X
...ermine which parts of the input cause the problem, try the following:
# Convert bytes in the 8-bit range (high bit set) to hex. representation.
# -> 'voil\x{e0}'
iconv -f ASCII --byte-subst='\x{%02x}' <<<$'voil\x{e0}'
The output will show you all bytes that have the high bit set (...
Create a matrix of scatterplots (pairs() equivalent) in ggplot2
...ykey = '.ykey', yvalue = '.yvalue',
na.rm = FALSE, convert = FALSE, factor_key = FALSE) {
vars <- quos(...)
xkey <- enquo(xkey)
xvalue <- enquo(xvalue)
ykey <- enquo(ykey)
yvalue <- enquo(yvalue)
data %>% {
cbind(gather(., key = !!xkey, valu...
Recommendation for compressing JPG files with ImageMagick
...ize of the jpeg.
Strip any comment or exif tag
in imagemagick should be
convert -strip -interlace Plane -gaussian-blur 0.05 -quality 85% source.jpg result.jpg
or in the newer version:
magick source.jpg -strip -interlace Plane -gaussian-blur 0.05 -quality 85% result.jpg
hope this be useful.
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How do you create a yes/no boolean field in SQL server?
...hat is the best practice for creating a yes/no i.e. Boolean field when converting from an access database or in general?
...
Moving matplotlib legend outside of the axis makes it cutoff by the figure box
...be M inches by N inches. Just play with this until it looks right for you. Convert it to a more scalable image format and use GIMP to edit if necessary, or just crop with the LaTeX viewport option when including graphics.
sh...
Measure the time it takes to execute a t-sql query
...ECLARE @SchemaName SYSNAME;
DECLARE @ProcName SYSNAME=N'TestProc';
SELECT CONVERT(TIME(3),DATEADD(ms,ROUND(last_elapsed_time/1000.0,0),0))
AS LastExecutionTime
FROM sys.dm_exec_procedure_stats
WHERE OBJECT_NAME(object_id,database_id)=@ProcName AND
(OBJECT_SCHEMA_NAME(object_id,databas...
Convert JsonNode into POJO
...
In Jackson 2.4, you can convert as follows:
MyClass newJsonNode = jsonObjectMapper.treeToValue(someJsonNode, MyClass.class);
where jsonObjectMapper is a Jackson ObjectMapper.
In older versions of Jackson, it would be
MyClass newJsonNode = jso...