How to convert a TChain to an array in root_numpy? - rootpy

What is the best way to convert a TChain to an array in root_numpy?
The function tree2array only works with trees, and it would be nice to not have to manually loop over every file and make a tree for each separate file.
Thanks in advance!

Related

Explode from a txt file

I use explode in my php code to load the strings from a txt file into an array. The strings are loaded into array with no problem, however, the first element has an index 0 but I want it to have an index 1. How do I achieve that?
I appreciate any help cause I've tried so many things and nothing seems to be working and I feel I got stuck.
You can use array_unshift to insert dummy element then remove it using unset as follows :
$ex_array = array("PHP","JAVA","C#","Python", "Javascript", "C");
array_unshift($ex_array,"");
unset($ex_array[0]);

Is it possible to convert a image to an Array?

I want to be able to input an image and get out an Array such as {{55,132,97},{55,125,97},} for an image, 1 Array per pixel
what I need help with is how would I go about this? I would prefer lua but I could also use C# and python
also what libraries or whatever they are called would I need?

Logstash: Copy array field into another

I would like to know if there is any simple way in logstash to copy all the elements of one field array to another. Put another way, is there a way to copy all the nested fields of a top-level field to another top-level field?
I'm having this problem because I'm dealing with a nonstandard multiline log format which is not necessarily thread-safe. So in order to make sure I get all the data I need and in the right order, I'm currently on planning on throwing every relevant value of each type into an array, and then sorting them out later. The problem I'm having is that logstash doesn't seem to support too much array manipulation. If you think my approach just won't work at all in logstash, any suggestions as to what I could do instead would be greatly appreciated.
Thanks!
As this question almost shows: LogStash: How to make a copy of the #timestamp field while maintaining the same time format? you can use the ruby filter to copy an array.
filter {
ruby {
code => "event['another_top_level_field'] = event['top_level_field']"
}
}

unsure of the best data type to use

I am creating a Sudoku project in vb.net, to such an end I need to store a list of all the possibilities for each square where the squares are indexed by one number. for example the computer needs to know that for square [8] the numbers {1,3,5,9} are possible etc... I began by using a jagged array however there is no apparent 'remove' method which needs to be called a lot. this makes my code looks ugly with all the redim statements in it and so I was curious as to whether a list or arraylist would be best suited to my purposes? I have discovered arraylists have a remove method but I have also read that array lists are all but deprecated and i want to know if there is a nicer solution to this.

VBA modifying inside array

I am sure this is a very simple question but what's the best way to multiply everything in an array with say 100, or take square root of everything inside an array, without copying it or a for loop?
Thanks!
There is no way to do that in VBA.

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