jacquard | Split testing server | Runtime Evironment library

You need to do regex search along with $in operator :

To find distances within Class A and Class B, you can use DataFrame.groupby, (distance used is euclidean):

The issue is that your check in ifelse is only checking once -- it is just seeing if "ACCESS_WIFI_STATE" is present in any of the rows. Because it is only checking once, ifelse is returning a single value. In this case, the result for the first row just happens to be 0.

You need to change the call to ifelse to get it to check each row separately. Here, I am just using sapply to check each row and return TRUE/FALSE for each

The key that is generated when you call push() is a pure client-side operation. No call to the server is involved when you call push() without arguments. So the first two snippets of code you shared are equivalent.

In your last code snippet the push({...}) does call out to the server to write the object to the database. But here too the key for the new child node is generated in the client-side code.

For more on these push IDs, see the blog post: The 2^120 Ways to Ensure Unique Identifiers.

In js you have two same functions with passing different parametres, second function would not work as it has the same name, you can use same function for both and pass it just id name of the audio element as following:

It's possible that your file doesn't contain proper line end markers like your program expects but your code assumes that file just got numrecords end-of-line markers. Where that variable defined and how you get it is other question. Do not use static array here, use std::list, use list::reverse_iterator (can get value from list::rbegin(), iterate 10 times unless iterator becomes equal to list::rend()) to iterate through last 10 records, your code would be far simpler (actually, just few lines)