You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: struct_sqrt.m
    path of file: ./repos/mtt/libs/tensorlab
    
    the code of the file until where you have to start completion: function [x,state] = struct_sqrt(z,task)
%STRUCT_SQRT Square root.
%   [x,state] = struct_sqrt(z,[]) computes x as sqrt(z). The structure
%   state stores information which is reused in computing the right and

    
function [x,state] = struct_sqrt(z,task)
%STRUCT_SQRT Square root.
%   [x,state] = struct_sqrt(z,[]) computes x as sqrt(z). The structure
%   state stores information which is reused in computing the right and
%   left Jacobian-vector products.
%
%   struct_sqrt(z,task) computes the right or left Jacobian-vector product
%   of this transformation, depend