Update Plot frame from slider call back

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I am trying to update an animated plot with a slider. Such that the value of the slider changes the plot to that frame in the animation. My code for the movie is:
plot(x,y,'--r','LineWidth',3); % original position
xlabel('Beam Length (in.)','Color','g');
ylabel(bstr,'Color','g');
ylim([-(Beam.y(10)) max(Beam.y)]);
title(astr,'Color','y','fontweight','b');
set(S.ax,'YDir','reverse');
set(S.ax,'XGrid','on');
set(S.ax,'YGrid','on');
xZero =0;
yZero = 0;
hold on % hold the orginal position plot and the axes properties
M(100) = struct('cdata',[], 'colormap', []); % preinitialization
ht = plot(xZero,yZero,'-b','linewidth',2); % new position
for i = 1:100 % Plots each new position on the graph animating the process
if i == 1
set(ht ,'XDataSource','Beam.x')
set(ht,'YDataSource','Beam.y')
end
set(ht,'XData',Beam.x(1:i))
set(ht,'YData',Beam.y(1:i))
M(i) = getframe(gcf);
end
legend('Without Deflection','With Deflection');
hold off
I then have a slider call back to gather all of the info. _Every time_ I use the slider though I get the error: Undefined function of variable 'ht' The code for my call back is:
function [] = sl_call_video(varargin)
%%%%%%%%%%%%%%Callback for the edit box and slider. %%%%%%%%%%%%%%%%%%%%%%
[h,S] = varargin{[1,3]}; % Get calling handle and structure.
SL = get(S.sl,{'min','value','max'}); % Get the slider's info.
E = str2double(get(h,'string')); % Numerical edit string.
%%%%%%%%%%%%%%%%%%%%%%%%%Actual Process %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
switch h % Who called?
case S.ed(2)
if E >= SL{1} && E <= SL{3}
set(S.sl,'value',E) % E falls within range of slider.
else
set(S.ed(2),'string',SL{2}) % User tried to set slider out of range.
end
case S.sl
set(S.ed(2),'string',round(SL{2}))% Set edit to current slider.
set(ht,'XData',Beam.x(1:SL{2}))
set(ht,'YData',Beam.y(1:SL{2}))
refreshdata
drawnow
otherwise
end
end

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