收到此错误“未为常量Zdata呈现警告轮廓”

Question

我使用以下代码收到此错误。谁能帮助我了解我为什么会遇到此错误。 min（）正常工作在八度。

results = eye(64,3);
count = 0;

for C_test = [0.01 0.03 0.1 0.3 1 3 10 30]
    for sigma_test = [0.01 0.03 0.1 0.3 1 3 10 30]
        count = count + 1;
        model = svmTrain(X, y, C_test, @(x1, x2) gaussianKernel(x1, x2, sigma_test));
        predictions = svmPredict(model, Xval);
        prediction_error = mean(double(predictions ~= yval));

        results(coun,:) = [C_test, sigma_test, prediction_error];     
    end
end

opt=min(results);
C = opt(1);
sigma = opt(2);