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: SmoothStep.m
    path of file: ./repos/lc_toolbox/Modules/Identification/Signals
    
    the code of the file until where you have to start completion: % This file is part of LCToolbox.
% (c) Copyright 2018 - MECO Research Team, KU Leuven. 
%
% LCToolbox is free software: you can redistribute it and/or modify
% it under the terms of the GNU Lesser General Public License as published 
% by the Free Software Foundation, either version 3 of the License, or
% (at your option) any later version.
% 
% LCToolbox is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
% GNU Lesser General Public License for more details.
% 
% You should have received a copy of the GNU Lesser General Public License
% along with LCToolbox. If not, see <http://www.gnu.org/licenses/>.

classdef SmoothStep < TimeSignal
    %SMOOTHSTEP A 1-dimensional smooth step signal
    %   Detailed explanation goe
    
function self = SmoothStep1(self, label, fs, twindow, t0, risetime)
            
            % input parsing

            p = inputParser;
            addRequired(p,'label',@(x) assert(ischar(x),'Your label should be a string.'));
            addRequired(p,'fs',@(x) assert(isnumeric(x) && length(x)==1 && x > 0,'The sample frequency should be a positive numeric scalar.'));
            addRequired(p,'twindow',@(x) assert(isnumeric(x) && (~any(size(x) ~= [1 2]) || ~any(size(x) ~= [2 1])) && x(2) > x(1) && x(1) >= 0,'Your time window [tmin, tmax] should satisfy tmax > tmin > 0.'));
            addRequired(p,'t0',@(x) assert(isnumeric(x) && length(x)==1 && x >= 0,'t0 should be a positive numeric scalar.')); 
            addRequired(p,'risetime',@(x) assert(isnumeric(x) && length(x)==1 && x > 0,'The rise time should be a positive numeric scalar.'));
            parse(p,label,fs,twindow,t0,risetime);
            
            % assign properties
            
            self.label_ = p.Results.label;
            self.tmin_ = p.Results.twindow(1);
            self.tmax_ = p.Results.twindow(2);
            self.fs_ = p.Results.fs;
            self.t0_ = p.Results.t0;
            self.riseTime_ = p.Results.risetime;
            self.fmin_ = 0;
            self.fmax_ = fs/2;
            
            % additional 'inter-argument' checks
            
            if self.t0_ > self.tmax_ || self.tmin_ > self.t0_; error('t0 does not belong to your time window.'); end