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--- manual:ras [2013/10/08 15:37] – created zenke
+++ manual:ras [2016/08/08 20:21] – Changes intro paragraph zenke
@@ Line 1: / Line 1: @@
-The file extension "RAS" is used for spiking data files created by the [[SpikeMonitor]]. The format is a space separated list containing "time  neuronnumber" pairs:
+====== ras file format definition ======
+The ras file format is a human readable ASCII file format to encode spiking activity from a population of numbered neurons. The format is a space separated list containing "time  neuronnumber" pairs, of which time is given in seconds and the neuron id is given as integer:
 <code>
@@ Line 9: / Line 11: @@
 .716600  1464
 </code>
+The neuron number refers to the [[NeuronID]] within a [[SpikingGroup]]. The suggested file extension "ras" and as it is used for created by the [[SpikeMonitor]].
-Time is as usual given in units of seconds. The neuron number refers to the [[NeuronID]] within a [[SpikingGroup]].
+===== Merging ras files from multiple ranks =====
+When [[parallel execution|running in parallel]] you will often encounter having to merge the ras files from multiple ranks (e.g. output.X.ras). This can be done efficiently using linux ''sort'' program
+<code shell>
+sort -g -m output.*.ras > output.ras
+</code>