How do you plot two graphs on the same figure with a loop?

I am trying to plot the original mesh versus the deformed mesh on the same plot. I have used this loop to plot the original mesh earlier. I am trying to use it with some additonal code to plot both figures on the same graph. My displacement matrix is in the form of [ux1 uy1 ux2 uy2...etc.]. Currently I can only see one figure and it is green.

Thank you in advance.

%plots undeformed and deformed structure 
function PlotMeshonMesh(coordinates,nodes,displacement)

nel = length(nodes); %number of elements
nnode = length(coordinates); %total number of nodes in system
nnel = size(nodes,2); %number of nodes per element
% 
% empty required matrices
X = zeros(nnel,nel);
Y = zeros(nnel,nel);
Z = zeros(nnel,nel);
scalefactor=100;
%
for iel=1:nel   
     for i=1:nnel
     nd(i)=nodes(iel,i); %extract connected node for (iel)-th element
     X(i,iel)=coordinates(nd(i),1); %extract x value of the node
     Y(i,iel)=coordinates(nd(i),2);%extract y value of the node
     uX(i,iel)=coordinates(nd(i),1)+displacement(2*nnel-1,1)*scalefactor; %extract x value of the node with displacement
     uY(i,iel)=coordinates(nd(i),2)+displacement(2*nnel,1)*scalefactor; %extract y value of the node with displacement 
     end
     
end 

%Plotting the FEM mesh and profile of the given component
     f4 = figure ;
     set(f4,'name','Postprocessing','numbertitle','off') ;
     plot(X,Y,'k',uX,uY,'g')
     
end

[TADA]

what about

hold on;

[Monique Embury]

%plots undeformed and deformed structure 
function PlotMeshonMesh(coordinates,nodes,displacement)

nel=length(nodes); %number of elements
nnel=size(nodes,2); %number of nodes per element
nnode=length(coordinates); %number of nodes
% 
% empty required matrices
X=zeros(nnel,nel);
Y=zeros(nnel,nel);
ux=zeros(nnel,nel);
uy=zeros(nnel,nel);
scalefactor=10^6;
%
for iel=1:nel   
     for i=1:nnel
     nd(i)=nodes(iel,i); %extract connected node for (iel)-th element
     X(i,iel)=coordinates(nd(i),1); %extract x value of the node
     Y(i,iel)=coordinates(nd(i),2); %extract y value of the node
        for p=1:nnode
        ux(i,iel)=displacement(2*p-1,1)*scalefactor %extract x value of the node with displacement
        uy(i,iel)=displacement(2*p,1)*scalefactor %extract y value of the node with displacement 
        end
     end 
end 

hold on;
%Plotting the FEM mesh and profile of the given component
     f4 = figure ;
     %set(f4,'name','Postprocessing','numbertitle','off') ;
     plot(ux,uy,'r')
     hold on
     plot(X,Y,'k')
     hold off
   
     
end 

I have tried that. I think my problem has become finding the correct values for ux and uy.

[Adam Danz]

Maybe the values of ux and uy (which are shown on the plot in green) are much larger than x and Y (which do not appear on the plot). In other words, maybe X and Y are so tiny that you can't see them. Another possiblity is that they are empty. Yet another possibility is that they are exactly the same as ux and uy so they are plotted under the green lines.

[Monique Embury]

Thank you Adam. It seems as though the loop is not gathering the values calculated from my displacement command earlier.