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Compare two data.frames to find the rows in data.frame 1 that are not present in data.frame 2
...for me, but it seems to only work as shown above if one set contains identically matching rows of the other set. Consider this case: a2 <- data.frame(a = c(1:3, 1), b = c(letters[1:3], "c")). Leave a1 the same. Now try the comparison. It's not clear to me even in reading the options what the prop...
Difference between Role and GrantedAuthority in Spring Security
...tion of the hasAuthority() method in SecurityExpressionRoot - which simply calls hasRole()). With Spring Security 4, the treatment of roles is more consistent and code that deals with "roles" (like the RoleVoter, the hasRole expression etc.) always adds the ROLE_ prefix for you. So hasAuthority('ROL...
Android ListView not refreshing after notifyDataSetChanged
...
adapter.notifyDataSetChanged();
}
what you just have updated before calling notifyDataSetChanged() is not the adapter's field private List<Item> items; but the identically declared field of the fragment. The adapter still stores a reference to list of items you passed when you created t...
How to save an image to localStorage and display it on the next page?
So, basically, I need to upload a single image, save it to localStorage, then display it on the next page.
7 Answers
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What do you call the -> operator in Ruby?
...("Methods, Procs, Lambdas, and Closures"), a lambda defined using -> is called lambda literal.
succ = ->(x){ x+1 }
succ.call(2)
The code is equivalent to the following one.
succ = lambda { |x| x + 1 }
succ.call(2)
Informally, I have heard it being called stabby lambda or stabby literal...
How to create a jQuery function (a new jQuery method or plugin)?
... @candide at which point $('my_div').myfunction(); will be call
– Nikhil G
Jun 25 '15 at 6:10
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What is the (best) way to manage permissions for Docker shared volumes?
...the host and editing it there, create a new container to do that job. Lets call it some/graphitetools. Lets also create the appropriate user/group, just like the some/graphite image.
FROM debian:jessie
# add our user and group first to make sure their IDs get assigned consistently, regardless of ot...
How to call C from Swift?
Is there a way to call C routines from Swift?
6 Answers
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How do I disable a Pylint warning?
...d of having to remember all those code numbers. E.g.:
# pylint: disable=locally-disabled, multiple-statements, fixme, line-too-long
This style is more instructive than cryptic error codes, and also more practical since newer versions of Pylint only output the symbolic name, not the error code.
T...
An expression tree may not contain a call or invocation that uses optional arguments
...ault values at compile time (hard-coded), because the CLR does not support calling methods with optional arguments either when the arguments are not provided explicitly.
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