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: DEMO_febio_0078_actuator_perfect_osmometer_01.m
    path of file: ./repos/GIBBON/docs
    
    the code of the file until where you have to start completion: %% DEMO_febio_0078_actuator_perfect_osmometer_01
% Below is a demonstration for:
% 
% * Building geometry for a cube with hexahedral elements
% * Defining the boundary conditions 
% * Coding the febio structure
% * Running the model
% * Importing and visualizing the displacement and stress results

%% Keywords
%
% * febio_spec version 4.0
% * febio, FEBio
% * perfect osmometer
% * hexahedral elements, hex8
% * cube, box, rectangular
% * static, solid
% * displacement logfile
% * stress logfile

%%

clear; close all; clc;

%% Plot settings
fontSize=20;
faceAlpha1=0.8;
markerSize=40;
markerSize2=25;
lineWidth=3;
cMap=spectral(250); %colormap 

%% Control parameters

% Path names
defaultFolder = fileparts(fileparts(mfilename('fullpath'))); 
savePath=fullfile(defaultFolder,'data','temp');

% Defining file names
febioFebFileNamePart='tempModel';
febioFebFileName=fullfile(savePath,[febioFebFileNamePart,'.feb']); %FEB file name
febioLogFileName=[febioFebFileNamePart,'.txt']; %FEBio log file name
f
    
function offers the boundary faces with
% seperate labels for the top, bottom, left, right, front, and back sides.
% As such these can be used to define boundary conditions on the exterior. 

% Create a box with hexahedral elements
cubeDimensions=[sampleWidth sampleThickness sampleHeight]; %Dimensions
cubeElementNumbers=[numElementsWidth numElementsThickness numElementsHeight]; %Number of elements
outputStructType=2; %A structure compatible with mesh view
[meshStruct]=hexMeshBox(cubeDimensions,cubeElementNumbers,outputStructType);

%Access elements, nodes, and faces from the structure
E=meshStruct.elements; %The elements 
V=meshStruct.nodes; %The nodes (vertices)
Fb=meshStruct.facesBoundary; %The boundary faces
Cb=meshStruct.boundaryMarker; %The "colors" or labels for the boundary faces
elementMaterialIndices=ones(size(E,1),1); %Element material indices

%%

VE=patchCentre(E,V);
logicSide=VE(:,1)<0;
E1=E(logicSide,:); %First set
E2=E(~logicSide,:); %Second set
E=[E1;E2]; %Reorder full set

%% 
% Plotting model boundary surfaces and a cut view

hFig=cFigure; 

subplot(1,2,1); hold on; 
title('Model boundary surfaces and labels','FontSize',fontSize);
gpatch(Fb,V,Cb,'k',faceAlpha1); 
colormap(gjet(6)); icolorbar;
axisGeom(gca,fontSize);

hs=subplot(1,2,2); hold on; 
title('Cut view of solid mesh','FontSize',fontSize);
optionStruct.hFig=[hFig hs];
meshView(meshStruct,optionStruct);
axisGeom(gca,fontSize);

drawnow;

%% Defining the boundary conditions
% The visualization of the model boundary shows colors for each side of the
% cube. These labels can be used to define boundary conditions. 

%Prescribed displacement nodes
bcSupportList=unique(Fb(Cb==5,:)); %Node set for selected face

%% 
% Visualizing boundary conditions. Markers plotted on the semi-transparent
% model denote the nodes in the various boundary condition lists. 

hf=cFigure;
title('Boundary conditions','FontSize',fontSize);
xlabel('X','FontSize',fontSize); ylabel('Y','FontSize',fontSize); zlabel('Z','FontSize',fontSize);
hold on;

gpatch(Fb,V,'kw','k',0.5);

hl(1)=plotV(V(bcSupportList,:),'k.','MarkerSize',markerSize);

legend