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: ProjectedGdFista.m
    path of file: ./repos/StackExchangeCodes/Mathematics/Q3872982
    
    the code of the file until where you have to start completion: function [ vX, vV, mX ] = ProjectedGdFista( vX, vV, hG, hP, numIterations, stepSize )
% ----------------------------------------------------------------------------------------------- %
% [ vX, vV, mX ] = ProjectedGdFista( vX, vV, hG, hP, numIterations, stepSize )
% Solves an objective function by the Projected Gradient Descent /

    
function [ vX, vV, mX ] = ProjectedGdFista( vX, vV, hG, hP, numIterations, stepSize )
% ----------------------------------------------------------------------------------------------- %
% [ vX, vV, mX ] = ProjectedGdFista( vX, vV, hG, hP, numIterations, stepSize )
% Solves an objective function by the Projected Gradient Descent /
% Projected Gradient Method (PGM) with FISTA Acceleration.
% Input:
%   - vX                -   Input Vector.
%                           The starting point for the gradient iterations.
%                           Structure: Vector (numElements x 1).
%                           Type: 'Single' / 'Double'.
%                           Range: (-inf, inf).
%   - vV                -   Acceleration Vector.
%                           The buffer to hold the accelerated direction
%                           vector.
%                           Structure: Vector (numElements x 1).
%                           Type: 'Single' / 'Double'.
%                           Range: (-inf, inf).
%   - hG                -   Gradient Function Handler.
%                           A function handler which accepts a vector of
%                           size (numElements x 1) and returns the gradient
%                           in the form of a vector (numElements x 1).
%                           Structure: Function Handler.
%                           Type: NA.
%                           Range: NA.
%   - hP                -   Gradient Function Handler.
%                           A function handler which accepts a vector of
%                           size (numElements x 1) and returns the gradient
%                           in the form of a vector (numElements x 1).
%                           Structure: Function Handler.
%                           Type: NA.
%                           Range: NA.
%   - numIterations     -   Number of Iterations.
%                           Sets the number of iterations of the gradient
%                           descent.
%                           Structure: Scalar.
%                           Type: 'Single' / 'Double'.
%                           Range: {1, 2, 3, ...}.
%   - stepSize          -   Step Size.
%                           Sets the step size of the Gradient step.
%                           Structure: Scalar.
%                           Type: 'Single' / 'Double'.
%                           Range: (0, inf).
% Output:
%   - vX                -   Output Vector.
%                           The end