Examples of ca.nengo.model.impl.ProbeableOrigin

ca.nengo.model.impl.ProbeableOrigin
An Origin that obtains output from an underlying Probeable object.

As an example of use, suppose a Neuron has a SynapticIntegrator with a complex dendritic morphology, and that it is desired to model a gap junction between one of these dendrites and a dendrite on another Neuron. If the SynapticIntegrator can provide gap-junctional Origins, there is no problem. But it might not (for example the implementor of the SynapticIntegrator may not have anticipated this usage). However, if the SynapticIntegrator is Probeable and can be probed for the appropriate state variables, eg ion concentrations in the compartment of interest, then this class (ProbeableOrigin) provides a convenient way to model an Origin that outputs the probed information.

For a Neuron, if multi-dimensional state is to be output, it is generally better to create multiple one-dimensional Outputs than to creat one multi-dimensional Output. Reasons for this include the following:
- As with all Origins, all the output values at a given instant have the same units. So, if you want to output states with different units, you must use separate Origins.
- Ensembles may combine identically-named Ouputs of different Neurons into a single Ensemble-level Output (with the same dimension as the number of Neurons that have that Output). This doesn't work well with multi-dimensional Neuron Outputs. So, if your Neurons will be grouped into an Ensemble, it's better to stick with 1-D Outputs. The other option (which seems more convoluted) is to make sure that each Neuron's n-D Output has a distinct name (ie distinct from the names of the correspoding Outputs of other Neurons in the same Ensemble). Incorporating a number into the name is one way to do this.

  /*
   * Test method for 'ca.bpt.cn.model.impl.ProbeableOrigin.getName()'
   */
  public void testGetName() throws StructuralException {
    String name = "test";
    ProbeableOrigin origin = new ProbeableOrigin(null, new MockProbeable(new float[0]), "x", 0, name);
    assertEquals(name, origin.getName());
  }

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  /*
   * Test method for 'ca.bpt.cn.model.impl.ProbeableOrigin.getDimensions()'
   */
  public void testGetDimensions() throws StructuralException {
    ProbeableOrigin origin = new ProbeableOrigin(null, new MockProbeable(new float[0]), "x", 0, "test");
    assertEquals(1, origin.getDimensions());
  }

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//      fail("Should have thrown exception because state x TimeSeries has length 0");
//    } catch (SimulationException e) {} //exception is expected
    
    //test that last TimeSeries value is returned, etc.
    MockProbeable p = new MockProbeable(new float[]{-1f, 1f});
    ProbeableOrigin origin = new ProbeableOrigin(null, p, "x", 0, "test");
    
    assertEquals(Units.UNK, origin.getValues().getUnits());
    assertTrue(origin.getValues() instanceof RealOutput);
    assertEquals(1, ((RealOutput) origin.getValues()).getDimension());
    assertTrue(((RealOutput) origin.getValues()).getValues()[0] > 0);
  }

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    assertTrue(((RealOutput) origin.getValues()).getValues()[0] > 0);
  }
  
  public void testConstructor() {
    try {
      new ProbeableOrigin(null, new MockProbeable(new float[0]), "y", 0, "test");
      fail("Should have thrown exception because state y doesn't exist");
    } catch (StructuralException e) {} //exception is expected
  }

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Related Classes of ca.nengo.model.impl.ProbeableOrigin

ca.nengo.model.impl.ProbeableOriginTest

ca.nengo.model.StructuralException

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