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Check if the number is integer
...reliable way:
check.integer <- function(N){
!grepl("[^[:digit:]]", format(N, digits = 20, scientific = FALSE))
}
check.integer(3243)
#TRUE
check.integer(3243.34)
#FALSE
check.integer("sdfds")
#FALSE
This solution also allows for integers in scientific notation:
> check.integer(222e3)...
Moving decimal places over in a double
...Decimal(x));
prints:
0.100000000000000005551115123125782702118158340454101562
12.339999999999999857891452847979962825775146484375
In short, rounding is unavoidable for sensible answers in floating point whether you are doing this explicitly or not.
Note: x / 100 and x * 0.01 are not exactly ...
How can I wrap text in a label using WPF?
... to set Padding="5" to match the padding in my other Label controls on the form. See Rajesh's answer below.
– Bob Kaufman
Jul 21 '18 at 18:34
...
Is there an easy way to request a URL in python and NOT follow redirects?
... @Hamish requests allows you to access headers both in the canonical form and in lowercase. See docs.python-requests.org/en/master/user/quickstart/…
– Marian
May 12 '17 at 7:21
...
jQuery disable/enable submit button
...ummary
To [...] change DOM properties such as the [...] disabled state of form elements, use the .prop() method.
(http://api.jquery.com/attr/)
As for the disable on change part of the question: There is an event called "input", but browser support is limited and it's not a jQuery event, so jQue...
Android Webview - Completely Clear the Cache
... }
}
catch(Exception e) {
Log.e(TAG, String.format("Failed to clean the cache, error %s", e.getMessage()));
}
}
return deletedFiles;
}
/*
* Delete the files older than numDays days from the application cache
* 0 means all files.
*/
public static voi...
What is boilerplate code?
...eces that were syndicated were sent out to subscribing
newspapers in the form of a mat (i.e. a matrix). Once received,
boiling lead was poured into this mat to create the plate used to
print the piece, hence the name boilerplate. As the article printed
on a boilerplate could not be altered...
What is referential transparency?
...l since 1999 and that capital is Edinburgh.
This sentence cannot be transformed to a nutty one. Problem solved! The point of Quine was to say that natural language is messy, or at least complicated, because it is made to be convenient for practical use, but philosophers and logicians should brin...
How to mock the Request on Controller in ASP.Net MVC?
...ink doesn't work, but the following seems to work _request.Setup(o => o.Form).Returns(new NameValueCollection());
– Vdex
May 31 '12 at 11:26
add a comment
...
How to randomize (or permute) a dataframe rowwise and columnwise?
...
Random Samples and Permutations ina dataframe
If it is in matrix form convert into data.frame
use the sample function from the base package
indexes = sample(1:nrow(df1), size=1*nrow(df1))
Random Samples and Permutations