stdcor.m

功能： 功率谱分析 算法参考文献：黄嘉佑

function [std_r]=stdcor(xindu,num)
warning off MATLAB:divideByZero;
if xindu>0.5
    f_std=1./(finv(xindu,num-2,1));
else
    f_std=finv(1-xindu,1,num-2);
end
std_r=sqrt(1./(1+(num-2)./f_std));