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How to combine multiple conditions to subset a data-frame using “OR”?
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filter(df, v1 < 0.5 | v2 == "g")
Using sqldf:
library(sqldf)
sqldf('SELECT *
FROM df
WHERE v1 < 0.5 OR v2 = "g"')
Output for the above options:
v1 v2
1 0.26550866 a
2 0.37212390 b
3 0.20168193 e
4 0.94467527 g
5 0.06178627 j
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ThreadStart with parameters
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+1: Even though the currently selected answer is absolutely correct, this one by JaredPar is the better one. It simply is the best solution for most practical cases.
– galaktor
Oct 10 '09 at 10:27
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How do I check if an HTML element is empty using jQuery?
...or more info see http://api.jquery.com/is/ and http://api.jquery.com/empty-selector/
EDIT:
As some have pointed, the browser interpretation of an empty element can vary. If you would like to ignore invisible elements such as spaces and line breaks and make the implementation more consistent you ca...
How do you comment out code in PowerShell?
...hin PowerShell ISE you can hit Ctrl+J to open the Start Snipping menu and select Comment block:
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How to remove the default link color of the html hyperlink 'a' tag?
...essing it, add inside the a tag: <A STYLE="text-decoration:none; color=[select your favorite...]" HREF="link.html"> test link</A>
– wiztrail
Mar 29 '12 at 22:29
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How to disable scrolling in UITableView table when the content fits on the screen
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You can set enable/disable bounce or scrolling the tableview by selecting/deselecting these in the Scroll View area
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WPF chart controls [closed]
...orts the touch mode. Various zoom types are supported (mouse wheel, pinch, selection).
Full Disclosure: I have been heavily involved in development of Visiblox, hence I know that library in much more detail than the others.
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How do you change the datatype of a column in SQL Server?
... was Altering (after running the script and right-clicking on the Table to select "Design") it still showed the old Data Types! It was only after closing ALL of my Tabs in Management Studio and opening the Design View again that it finally showed the updated DataType. Very scary, so be careful (it...
Create a matrix of scatterplots (pairs() equivalent) in ggplot2
... na.rm = na.rm, convert = convert, factor_key = factor_key),
select(., !!!vars))
} %>% gather(., key = !!ykey, value = !!yvalue, !!!vars,
na.rm = na.rm, convert = convert, factor_key = factor_key)
}
iris %>%
gatherpairs(Sepal.Length, Sepal.Width, Petal.Lengt...
Where can I find WcfTestClient.exe (part of Visual Studio)
...udio Installer, click on Modify, choose Individual components tab and then select (see below screenshot):
☑ Windows Communication Foundation
Click on Modify and voilà, application will be on your disk.
If you want to use WcfTestClient with no Visual Studio, see answer(s) on: How can the ...