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## org.neuroph.core.transfer
Class Sigmoid

    java.lang.Object
      org.neuroph.core.transfer.TransferFunction
          org.neuroph.core.transfer.Sigmoid

All Implemented Interfaces:
  java.io.Serializable

    public class Sigmoid

extends TransferFunction
implements java.io.Serializable

     Sigmoid neuron transfer function.

     output = 1/(1+ e^(-slope*input))

See Also:
  Serialized Form

Constructor Summary
`Sigmoid()` Creates an instance of Sigmoid neuron transfer function with default slope=1.
`Sigmoid(double slope)` Creates an instance of Sigmoid neuron transfer function with specified value for slope parametar.
`Sigmoid(java.util.Properties properties)` Creates an instance of Sigmoid neuron transfer function with the specified properties.

Method Summary
`double` | `getDerivative(double net)` Returns the first derivative of this function.
`double` | `getOutput(double net)` Returns the ouput of this function.
`double` | `getSlope()` Returns the slope parametar of this function
`void` | `setSlope(java.lang.Double slope)` Sets the slope parametar for this function

Methods inherited from class org.neuroph.core.transfer.TransferFunction
`toString`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Constructor Detail

### Sigmoid

    public Sigmoid()

  Creates an instance of Sigmoid neuron transfer function with default slope=1.

### Sigmoid

    public Sigmoid(double slope)

  Creates an instance of Sigmoid neuron transfer function with specified value for slope parametar.

  Parameters:
    `slope` - the slope parametar for the sigmoid function

### Sigmoid

    public Sigmoid(java.util.Properties properties)

  Creates an instance of Sigmoid neuron transfer function with the specified properties.

  Parameters:
    `properties` - properties of the sigmoid function

Method Detail

### getSlope

    public double getSlope()

  Returns the slope parametar of this function

  Returns:
    slope parametar of this function

### setSlope

    public void setSlope(java.lang.Double slope)

  Sets the slope parametar for this function

  Parameters:
    `slope` - value for the slope parametar

### getOutput

    public double getOutput(double net)

  Description copied from class: `TransferFunction`
  Returns the ouput of this function.

  Specified by:
    `getOutput` in class `TransferFunction`
  Parameters:
    `net` - net input

### getDerivative

    public double getDerivative(double net)

  Description copied from class: `TransferFunction`
  Returns the first derivative of this function.

  Overrides:
    `getDerivative` in class `TransferFunction`
  Parameters:
    `net` - net input

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