# Command: testsuite::test_iaf_ps_dc_t_accuracy

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Name:

    testsuite::test_iaf_ps_dc_t_accuracy - test of temporal accuracy of iaf_neuron subject to DC current

Synopsis:

    (test_iaf_ps_dc_t_accuracy) run ->  comparison with analytical solution

Description:

      A DC current is injected for a finite duration. The time of the first
      spike is compared to the theoretical value for different computation
      step sizes and interpolation orders.

      Computation step sizes are specified as base 2 values.

      The high accuracy of the neuron models is achieved by the use of
      Exact Integration [1] and an appropriate arrangement of the terms
      [2]. For small computation step sizes the accuracy at large
      simulation time decreases because of the accumulation of errors.

      The expected output is documented at the end of the script.
      Individual simulation results can be inspected by uncommented the
      call to function print_details.

Remarks:

      The script checks whether the simulator is appropriately configured.
      The script can be used to check whether the accuracy has survived optimization.

      In case the accuracy is higher than specified by IEEE arithmetics this might
      be due to the use of processor registers. The compiler option
      -ffloat-store of the gcc compiler ensures that doubles are not stored in
      registers.

References:

      [1] Rotter S & Diesmann M (1999) Exact simulation of time-invariant linear
      systems with applications to neuronal modeling. Biologial Cybernetics
      81:381-402.
      [2] Morrison A, Straube S, Plesser H E, & Diesmann M (2007) Exact Subthreshold
      Integration with Continuous Spike Times in Discrete Time Neural Network
      Simulations. Neural Computation 19:47--79

Author:

    March 2009, Diesmann

FirstVersion:

    May 2005

SeeAlso:

- iaf_psc_alpha_canon
- iaf_psc_alpha_presc
- iaf_psc_delta_canon
- testsuite::test_iaf_ps_dc_accuracy

Source:

    /opt/conda/conda-bld/nest_1512418773968/work/nest-2.14.0/testsuite/unittests/test_iaf_ps_dc_t_accuracy.sli

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