大约有 40,000 项符合查询结果（耗时：0.0435秒） [XML]
Ignoring time zones altogether in Rails and PostgreSQL
...e preferred type in the date/time family, literally. It has typispreferred set in pg_type, which can be relevant:
Generating time series between two dates in PostgreSQL
Internal storage and epoch
Internally, timestamps occupy 8 bytes of storage on disk and in RAM. It is an integer value representi...
Change R default library path using .libPaths in Rprofile.site fails to work
...hics functions. It works via side-effect. The functions Sys.getenv and Sys.setenv that report and alter the R environment variables have been split apart but .libPaths can either report or alter its target.
The information about the R startup process can be read at ?Startup help page and there is ...
Is it safe to remove selected keys from map within a range loop?
...ap source code. It looks like on a call to delete(k, v), it basically just sets a flag (as well as changing the count value) instead of actually deleting the value:
b->tophash[i] = Empty;
(Empty is a constant for the value 0)
What the map appears to actually be doing is allocating a set numbe...
CSS table column autowidth
... This solution works well without table-layout: fixed that is set in the css in the question jsfiddle.net/hCkch/1
– David Sherret
Jul 8 '13 at 19:34
1
...
Force R to stop plotting abbreviated axis labels - e.g. 1e+00 in ggplot2
...
This works by setting a higher penalty for deciding to use scientific notation. More explanation in this answer: stackoverflow.com/a/18600721/1080804
– ecoe
Jul 4 '16 at 14:09
...
Is there an equivalent of CSS max-width that works in HTML emails?
... equivalent of a centered div with max-width of 350px. You create a table, set the width to 100%. The table has three cells in a row. Set the width of the center TD to 350 (using the HTML width attribute, not CSS), and there you go.
If you want your content aligned left instead of centered, just l...
How to convert index of a pandas dataframe into a column?
...
either:
df['index1'] = df.index
or, .reset_index:
df.reset_index(level=0, inplace=True)
so, if you have a multi-index frame with 3 levels of index, like:
>>> df
val
tick tag obs
2016-02-26 C 2 0.0139
2016-02...
what is .netrwhist?
...
In addition, if one sets g:netrw_dirhistmax to zero, netrw will save no history or bookmarks:
:let g:netrw_dirhistmax = 0
Doing this will not cause any prior .netrwhist or .netrwbook files to be deleted, however.
...
Difference between JVM and HotSpot?
...lates what a real machine does. Like a real machine, it has an instruction set, a virtual computer architecture and an execution model. It is capable of running code written with this virtual instruction set, pretty much like a real machine can run machine code.
HotSpot is an an implementation of t...
How to add semicolon after method call when inside parameter list in IntelliJ IDEA?
...y making the voyage back to IntelliJ via Eclipse. Currently my Eclipse is set up so that if I currently have a statement such as this (where ^ denotes where my cursor currently sits):
...