XXX header in 1st column of connector data.frame

[zhihaozheng]

First column of the connector data.frame for neuron objects downloaded from CATMAID has variable name 'XXX' (unknown identifier). Also in 'connectors' documentation. I believe the number is 'treenode id'. If it is an outgoing connectors, the number is pre-synaptic treenode id; for incoming connectors, it is post-synaptic treenode id.

[jefferis]

Thanks @zhihaozheng. I've been meaning to fix that when I could check what it actually was. Can you give me some evidence that it is indeed the treenode id e.g. catmaid source, example results that you have cross checked etc. Many thanks, Greg.

[jefferis]

Thanks @zhihaozheng for sending more info privately. Just to clarify, is it your understanding that the treenode id always refers to the current skeleton rather than the partner?

[zhihaozheng]

Right. Say test_kc[[1]] is a neuron object. I used this one line code to test it.

all(test_kc[[1]]$connectors$XXX %in% test_kc[[1]]$d$PointNo)

Zhihao

On Feb 15, 2016, at 10:15 PM, Gregory Jefferis notifications@github.com wrote:

Thanks @zhihaozheng for sending more info privately. Just to clarify, is it your understanding that the treenode id always refers to the current skeleton rather than the partner?

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[jefferis]

Perfect. Thanks for confirming.