tribas

Triangular basis transfer function

Graph and Symbol

Triangular basis transfer function. The function returns 0 if input n is less than or equal to -1 or if n is greater than or equal to 1. When input n is between -1 and 1, the function takes the shape of a triangle, returning 1 when input n is 0.

Syntax

A = tribas(N,FP)

Description

tribas is a neural transfer function. Transfer functions calculate a layer’s output from its net input.

A = tribas(N,FP) takes N and optional function parameters,

N

S-by-Q matrix of net input (column) vectors

FP

Struct of function parameters (ignored)

and returns A, an S-by-Q matrix of the triangular basis function applied to each element of N.

info = tribas('code') can take the following forms to return specific information:

tribas('name') returns the name of this function.

tribas('output',FP) returns the [min max] output range.

tribas('active',FP) returns the [min max] active input range.

tribas('fullderiv') returns 1 or 0, depending on whether dA_dN is S-by-S-by-Q or S-by-Q.

tribas('fpnames') returns the names of the function parameters.

tribas('fpdefaults') returns the default function parameters.

Examples

Here you create a plot of the tribas transfer function.

n = -5:0.1:5;
a = tribas(n);
plot(n,a)

Assign this transfer function to layer i of a network.

net.layers{i}.transferFcn = 'tribas';

Algorithms

a = tribas(n) = 1 - abs(n), if -1 <= n <= 1
              = 0, otherwise

Version History

Introduced before R2006a

See Also

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