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How to avoid warning when introducing NAs by coercion
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answered Feb 20 '13 at 16:38
AndrieAndrie
157k3636 gold badges403403 silver badges464464 bronze badges
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Django connection to PostgreSQL: “Peer authentication failed”
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edited Sep 18 '17 at 11:05
answered Nov 22 '11 at 18:39
T...
How to create json by JavaScript for loop?
...ID"); // this works too
var status = document.getElementsByName("status")[0];
var jsonArr = [];
for (var i = 0; i < status.options.length; i++) {
jsonArr.push({
id: status.options[i].text,
optionValue: status.options[i].value
});
}
</script>
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Purge Kafka Topic
...;zkhost>:2181 --alter --topic <topic name> --config retention.ms=1000
And in newer Kafka releases, you can also do it with kafka-configs --entity-type topics
kafka-configs.sh --zookeeper <zkhost>:2181 --entity-type topics --alter --entity-name <topic name> --add-config retent...
How do I convert a hexadecimal color to rgba with the Less compiler?
...e absolute opacity % (higher value means less transparent):
fade(@color, 50%); // Return @color with 50% opacity in rgba
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How to get element by classname or id
... to access the DOM reference instead of the the jqLite reference - element[0] instead of element:
link: function (scope, element, attrs) {
var elementResult = element[0].getElementsByClassName('multi-files');
}
Alternatively you can use the document.querySelector function (need the period here...
Which terminal command to get just IP address and nothing else?
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You can write a script that only return the IP like:
/sbin/ifconfig eth0 | grep 'inet addr' | cut -d: -f2 | awk '{print $1}'
For MAC:
ifconfig | grep "inet " | grep -v 127.0.0.1 | cut -d\ -f2
Or for linux system
hostname -i | awk '{print $3}' # Ubuntu
hostname -i # Debian
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Intersection of two lists in Bash
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answered Apr 23 '10 at 3:58
ghostdog74ghostdog74
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Argmax of numpy array returning non-flat indices
...) on the result of numpy.argmax():
>>> a = numpy.random.random((10, 10))
>>> numpy.unravel_index(a.argmax(), a.shape)
(6, 7)
>>> a[6, 7] == a.max()
True
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