求助高手来！！！看下我程序的问题！！！！！！！！！

zhq179275581

data=(1:99)/100;
[mu,sigma]=lognfit(data)

运行结果：

mu =

   -0.9776    0.9276


sigma =

   -1.1626    0.8139
   -0.7925    1.0784

为什么MU有两个值啊 SIGMA有4个值啊

应该mu,sigma各只有一个值的啊！！！！！！！！！！！！！！！！！！！！！！！！

ChaChing

from matlab help

parmhat = lognfit(data) returns a vector of maximum likelihood estimates parmhat(1) = mu and parmhat(2) = sigma of parameters for a lognormal distribution fitting data. mu and sigma are the mean and standard deviation, respectively, of the associated normal distribution.

[parmhat,parmci] = lognfit(data) returns 95% confidence intervals for the parameter estimates mu and sigma in the 2-by-2 matrix parmci. The first column of the matrix contains the lower and upper confidence bounds for parameter mu, and the second column contains the confidence bounds for parameter sigma.