dmae (Neural Network Toolbox)

Neural Network Toolbox

dmae

Mean absolute error performance derivative function

Syntax

dPerf_dE = dmae('e',E,X,PERF,PP)

dPerf_dX = dmae('x',E,X,PERF,PP)

Description

dmae is the derivative function for mae.

dmae('d',E,X,PERF,PP) takes these arguments,

E -- Matrix or cell array of error vector(s)

X -- Vector of all weight and bias values

perf -- Network performance (ignored)

PP -- Performance parameters (ignored)

and returns the derivative dPerf/dE.

dmae('x',E,X,PERF,PP) returns the derivative dPerf/dX.

Examples

Here we define E and X for a network with one 3-element output and six weight and bias values.

E = {[1; -2; 0.5]};
X = [0; 0.2; -2.2; 4.1; 0.1; -0.2];

Here we calculate the network's mean absolute error performance, and derivatives of performance.

perf = mae(E)
dPerf_dE = dmae('e',E,X)
dPerf_dX = dmae('x',E,X)

Note that mae can be called with only one argument and dmae with only three arguments because the other arguments are ignored. The other arguments exist so that mae and dmae conform to standard performance function argument lists.

See Also

mae

dlogsig dmse