求助：matlab运行时出现??? Error using ==> chol

你好 我调整数据了还是不行 ，是跟我的数据中有负数有关系吗



9# lustboy

参考
http://www2.gsu.edu/~mkteer/npdmatri.html
http://answers.yahoo.com/question/index?qid=20080121033439AA90Ptg

According to 4# lustboy

Try changing the precision from double to single (matlab program has to initialize a matrix using the like statement :)
B = zeros(m,n)
By default B is of double precision, so to change it to single precision
A=single(B)

But this is not a generic method, even it could help getting arround your problem, it would possibly not work all the time.

Hessian 矩阵有很多种求法。可考虑用梯度方法计算一下。

跟数据中的负数没有关系，你可以尝试把各变量都除以其标准差，看看没有没改进。

richardma 发表于 2010-8-6 00:03
参考
http://www2.gsu.edu/~mkteer/npdmatri.html
http://answers.yahoo.com/question/index?qid=2008012 ...

you are right

改变一下矩阵的算法