Error in matlab code for best c and gamma using svmtrain()
6 次查看(过去 30 天)
显示 更早的评论
In the following code snippet:
for i=1:numel(C)
cv_acc(i) = svmtrain(labels, data, sprintf('-c %f -g %f -v %d ', 2^C(i), 2^gamma(i), folds));
end
I get the Error: label vector and instance matrix must be double In an assignment A(I) = B, the number of elements in B and I must be the same.
Please advise.
0 个评论
回答(1 个)
Walter Roberson
2017-1-20
It looks to me that you are using libsvm syntax. However I suspect that you are getting the svmtrain that is part of the Statistics toolbox which uses a different syntax.
Your code assumes that you will get back a single value each time. We cannot tell whether it expecting a numeric value or a structure member or a cell array. Whatever it expected, it is not getting back exactly one of whatever is being returned. That can happen if a routine returns an empty variable rather than a single value.
If you were expecting a single numeric value returned then you are probably not calling the routine correctly.
2 个评论
Walter Roberson
2017-1-21
Use
which svmtrain
I suspect you will find you are using svmtrain from the Statistics toolbox
另请参阅
类别
在 Help Center 和 File Exchange 中查找有关 Statistics and Machine Learning Toolbox 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!