在Matlab中创建行级联矩阵

Question

如何在Matlab中创建一个级联矩阵，它会给出下面的结果？

[0.01 0.01 error1]
[0.01 0.03 error2]
...
[30 30 error64]

到目前为止，我尝试过的是下面的内容。

C =  [0.01, 0.03, 0.1, 0.3, 1, 3, 10, 30];
sigma =  [0.01, 0.03, 0.1, 0.3, 1, 3, 10, 30];

m = zeros(64,3);

for ci = C
for si = sigma
    train = svmTrain(X, y, ci, @(x1, x2) gaussianKernel(x1, x2, si));
    pred = svmPredict(train, X);
    error = mean(double(pred ~= y))    
    m = [m ; [C,sigma,error]];    
end
end

我期待64 X 3列矩阵。

Answer 1

您提供的代码似乎基本上就是这样。你应该从一个空矩阵开始。

m = []; % Initialize empty result matrix m 

for ci = C
    for si = sigma
        error = % Calculate error here
        m = [m ; [C,sigma,error]];  % concatenate new row onto m.
    end
end