No rules fired for Output 1. Defuzzified output value set to its mean range value 2.3873.

Someone knows the cause of this warning? and how to solve it?

Warning: No rules fired for Output 1. Defuzzified output value set to its mean range value 2.3873.

> In throwWarning (line 18)

In evalfis (line 93)

Here is my code,

subset = xlsread ('entrenamientoDrastic.csv', 1, 'A1:G420660');

nit = xlsread('nt2006.csv', 1, 'A1:WQ684');

nit = transpose(nit);

nit = reshape(nit,[], 1);

subset(:,7) = ((subset(:, 7)).*nit)/145;

subset = [subset nit];

[subset, ia, ic] = unique(subset,'rows','stable');

%rng('default');

% Cross varidation (train: 70%, test: 30%)

cv = cvpartition(size(subset,1),'HoldOut',0.3);

idx = cv.test;

% Separate to training and test data

train = subset(~idx,:);

test = subset(idx,:);

train_input = train(:, 1:6);

train_output = train(:,7);

test_input = test(:, 1:6);

test_output = test(:, 7);

opt = genfisOptions('FCMClustering','FISType','mamdani');

opt.NumClusters = 10;

opt.Exponent = 8.5;

%opt.Verbose = 2.1;

opt.MaxNumIteration = 100;

opt.MinImprovement = 1e-5;

fis = genfis(train_input,train_output,opt);

% Evaluate FIS

nit = test(:,8);

actY = evalfis(test_input,fis);

% Calculate RMSE

del = actY - test_output;

rmse = sqrt(mean(del.^2));

[rho,pval] = corr(nit,actY,'Type','Spearman');

The rmse gives an Inf value.