# Command: Connect

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Name:

    Connect - Establish a connection between two nodes or lists of nodes.

Synopsis:

      source target	 Connect
      source target	 syn_model Connect
      source target weight delay	 Connect
      source target weight delay syn_model Connect
      source target params	 Connect
      source target params	 syn_model Connect

      sources targets	 Connect
      sources targets conn_rule	 Connect
      sources targets conn_spec	 Connect
      sources targets conn_rule syn_model  Connect
      sources targets conn_spec syn_model  Connect
      sources targets conn_rule syn_spec   Connect
      sources targets conn_spec syn_spec   Connect

Description:

      Connects sources to targets according to the given connectivity
      specification conn_spec. Some connection rules impose requirements.
      E.g. /one_to_one requires that sources and targets have the same
      number of elements. Others may have additional parameters,
      e.g. connection probability /p for /pairwise_binomial.

      The variants with two global ids as arguments implicitly connect
      the two neurons using the all_to_all rule. If given, weight, delay,
      syn_model, and params are used for the connection.

      The variants with only literal arguments /conn_rule or /syn_model
      are shorthand for the corresponding calls with a connectivity or
      synapse specification dictionaries as explained in the Options
      section.  The literals are expanded to << /rule /conn_rule >> and
      << /model /syn_model >>, respectively.

      Parameters for connectivity rules must have fixed values.

      Parameters for synapses may be fixed single values and random deviate
      specifications.

Parameters:

      source	 integer 	- the GID of the source
      target	 integer 	- the GID of the target
      weight	 double  	- the weight of the connection
      delay	 double  	- the delay of the connection
      params	 dict		- dictionary with synapse parameters

      sources   array/intvector/gidcollection 	- the GIDs of the sources
      targets   array/intvector/gidcollection 	- the GIDs of the targets
      syn_model  literal 	- the name of the synapse model, see synapsedict
      syn_spec   dict		- dictionary with synapse model specification (see Options)
      conn_rule  literal 	- the name of the connection rule, see connruledict
      conn_spec  dict		- dictionary with connectivity specification (see Options)

Options:

      /conn_spec	- dictionary with connectivity specification, must at least contain /rule

      The following options may be given for all connection rules;
      not all rules support all options and many rules add rule-specific options.

      autapses	 bool 	- allow self-connections (default: true)
      multapses	 bool 	- allow multiple connections between pairs
      of neurons (default: true)
      symmetric	 bool 	- also create connection in opposite direction to
      obtain symmetric connections (default: false)

      /syn_spec 	- dictionary with synapse specification, must at least contain /model

Author:

    Hannah Bos, Hans Ekkehard Plesser, Jochen Martin Eppler

FirstVersion:

    January 2014

SeeAlso:

- synapsedict
- connruledict
- cvgidcollection

Source:

    /opt/conda/conda-bld/nest_1510212701067/work/nest-2.14.0/lib/sli/nest-init.sli

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