How to evaluate the performance by ANN

Hi,

I am working on ANN to recognize the characters. Here is the code. I want to know that how to evaluate the performance of trained network means accuracy of the network.

'trainingset' is the dataset for train the network and 'target' is shows the target vector of the trainingset.

close all; clear all;clc

load target;

%load train_1a;

% load trainingset

load trainingset

net = feedforwardnet([20 20], 'trainlm');

%net.performFcn = 'sse';

net.trainParam.lr=0.01;

net.trainParam.goal = 0.01;

net.trainParam.show = 20;

net.trainParam.epochs = 50;

%net.trainParam.mc = 0.95;

net.trainParam.min_grad =1e-15;

net.trainParam.max_fail =10;

net = train(net,trainingset,target);

Result = sim(net,trainingset) %sim it with dataset 'base'