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How do I delete rows in a data frame?
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The key idea is you form a set of the rows you want to remove, and keep the complement of that set.
In R, the complement of a set is given by the '-' operator.
So, assuming the data.frame is called myData:
myData[-c(2, 4, 6), ] # notice the -
Of course, don't forget to "reassign" ...
Checking for a null int value from a Java ResultSet
...) {
iVal = rs.getInt("ID_PARENT");
if (rs.wasNull()) {
// handle NULL field value
}
}
(Edited as @martin comments below; the OP code as written would not compile because iVal is not initialised)
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Get records with max value for each group of grouped SQL results
...alue for.
You avoid complicated subqueries that try to find the max() etc, and also the problems of returning multiple rows when there are more than one with the same maximum value (as the other answers would do)
Note: This is a mysql-only solution. All other databases I know will throw an SQL synta...
How to use ArrayAdapter
I have created row.xml in layouts, but don't know how to show both reason and long_val in the ListView using ArrayAdapter.
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Shared-memory objects in multiprocessing
...r array), place that in shared memory, wrap it with multiprocessing.Array, and pass that to your functions. This answer shows how to do that.
If you want a writeable shared object, then you will need to wrap it with some kind of synchronization or locking. multiprocessing provides two methods of do...
Jquery change background color
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});
});
The .queue() function waits for running animations to run out and then fires whatever's in the supplied function.
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Data Modeling with Kafka? Topics and Partitions
...type of consumer so in the example above, I would just have a single topic and if you´ll decide to push some other kind of data through Kafka, you can add a new topic for that later.
Topics are registered in ZooKeeper which means that you might run into issues if trying to add too many of them, e....
PreparedStatement with list of parameters in a IN clause [duplicate]
...( builder.length() -1 ).toString() + ")";
PreparedStatement pstmt = ...
And then happily set the params
int index = 1;
for( Object o : possibleValue ) {
pstmt.setObject( index++, o ); // or whatever it applies
}
sh...
How to Set focus to first text input in a bootstrap modal after shown
I load a dynamic bootstrap modal and it contains few text inputs. The issue i face that i want the cursor to focus on the first input in this modal, and this is not happening by default.
So i wrote this code to do it:
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Live character count for EditText
...g what the best way to do a live character count of an edit-text box is in Android. I was looking at this but I couldn't seem to make any sense of it.
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