Understanding function written in a book

Hi all,

I am new to optimization, and I pass through the following function (command) which is written in the book, but I do not understand...

can anyone explain more to me the following: which are the variables, which are constants?? and so on...and how the function work ??

clear all; 
clc; 
z= fzero( @( z) cdf( 'norm',z,0,1) -( 1-.95) ,0)

Answer 1

[Cris LaPierre]

These links should help get you started.

• https://www.mathworks.com/help/matlab/ref/fzero.html
• https://www.mathworks.com/help/stats/prob.normaldistribution.cdf.html
• https://www.mathworks.com/help/matlab/matlab_prog/anonymous-functions.html

Answer 2

[Jan]

z = fzero( @( z) cdf( 'norm',z,0,1) -( 1-.95) ,0)

% Simplify:
z0 = fzero(@(z) cdf('norm', z, 0, 1) - 0.05, 0)

fzero locates, where the given function is 0. The examined function is: cdf('norm', z, 0, 1) - 0.05, so you find out, where cdf() equals 0.05. You start the search at 0.

How fzero works is explained exhaustively in the documentation:

doc fzero