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Installing older version of R package
...all yesterday's version of checkpoint, by date
install.dates('checkpoint', Sys.Date() - 1)
# install earlier versions of checkpoint and devtools
install.versions(c('checkpoint', 'devtools'), c('0.3.3', '1.6.1'))
That has the advantage of not requiring Rtools to install binary packages on Windows,...
How to convert PascalCase to pascal_case?
...y you're checking if string matches all-caps string? What's the benefit of converting just the first character to lowercase (as opposed to all characters)?
– Josh
Sep 23 '15 at 17:17
...
How do I use installed packages in PyCharm?
... need to modify the path directly, either through environment variables or sys.path. Whether you use the os (ex. apt-get), or pip in a virtualenv, packages will be installed to a location already on the path.
In your example, GNU Radio is installed to the system Python 2's standard site-packages l...
How to select rows that have current day's timestamp?
...sed to select the rows. But the whole index is scanned (and all values are converted with DATE() to evaluate the condition) with your query. I'll update my answer with a better example.
– ypercubeᵀᴹ
Feb 8 '13 at 12:43
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Replacing blank values (white space) with NaN in pandas
...lso changed + to * to include the empty string "" in the list of things to convert to NaN
– Master Yogurt
Nov 18 '16 at 17:36
...
Getting an object from an NSSet
...ect to test for membership, use anyObject to get a member (not random), or convert it to an array (in no particular order) with allObjects.
A set is appropriate when you don't want duplicates, don't care about order, and want fast membership testing.
...
Merge / convert multiple PDF files into one PDF
How could I merge / convert multiple PDF files into one large PDF file?
18 Answers
18
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How do I get a Cron like scheduler in Python? [closed]
...ent
# Some utility classes / functions first
def conv_to_set(obj):
"""Converts to set allowing single integer to be provided"""
if isinstance(obj, (int, long)):
return set([obj]) # Single item
if not isinstance(obj, set):
obj = set(obj)
return obj
class AllMatch(s...
How do I convert datetime to ISO 8601 in PHP
How do I convert my time from 2010-12-30 23:21:46 to ISO 8601 date format? (-_-;)
6 Answers
...
Converting string into datetime
... tm_wday=2, tm_yday=152, tm_isdst=-1)
timestamp = time.mktime(my_time)
# convert time object to datetime
from datetime import datetime
my_datetime = datetime.fromtimestamp(timestamp)
# convert time object to date
from datetime import date
my_date = date.fromtimestamp(timestamp)
...