Double complex-Error using quadprog

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noramalina mohd hatta
回答： Walter Roberson 2016-4-28
Hi, I am converting data type of double since it has a big number to a normalize form. When i used the normalized data for SVM Classification, it turns out the accuracy is very low. So I decided to use log base 2 and then I put on SVM Classification I've got these answer
Error using quadprog (line 318) All inputs to QUADPROG must be real.
Error in svmtrain (line 528) [alpha, ~, exitflag, output] = quadprog(H,-ones(nPoints,1),[],[],...
How do I solve this?

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回答（1 个）

Walter Roberson
Walter Roberson 2016-4-28
Whatever values you are taking log2() of, appears to have some negative values, so the log2 is imaginary.

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