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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...
Set selected item of spinner programmatically
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calling SetSelection() just after setAdapter() seem to display the 1st item always (Android 2.3), even the good one is selected in the dropView. adding view.post() (@Marco Hernaiz Cao answer) fix it for me.
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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 onCreate or onStartCommand for starting service
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onCreate() is called when the Service object is instantiated (ie: when the service is created). You should do things in this method that you need to do only once (ie: initialize some variables, etc.). onCreate() will only ever be called on...
Horizontal ListView in Android?
...lery view, but the selected item comes to the center of the screen automatically. I don't want the selected item at the same spot I clicked. How can I rectify this problem? My idea was to set the ListView with a horizontal scroll. Share your idea?
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What is the relationship between UIView's setNeedsLayout, layoutIfNeeded and layoutSubviews?
...iew that marks it as needing layout. That will force layoutSubviews to be called on the view before the next redraw happens. Note that in many cases you don't need to call this explicitly, because of the autoresizesSubviews property. If that's set (which it is by default) then any change to a vie...
Oracle SQL Query for listing all Schemas in a DB
...t. However, there can be a semantic distinction where people only want to call something a schema if it actually owns at least one object so that the hundreds of user accounts that will never own any objects are excluded. In that case
SELECT username
FROM dba_users u
WHERE EXISTS (
SELECT ...
Parsing JSON giving “unexpected token o” error [duplicate]
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Just calling JSON.stringify will do nothing with your data, the function actually returns your now serialized data.
– Tom Hofman
Aug 15 '17 at 11:08
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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...
Completion handler for UINavigationController “pushViewController:animated”?
...wController:animated: returns -- thus, the completion handler will not get called until the newly-triggered animations have finished.
– Matt H.
Nov 20 '14 at 22:15
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