??? Attempted to access vv(:,1); index out of bounds because size(vv)=[0,0] - Help?

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Chris Corbett 2012-12-7

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Hi,I was hoping somebody would be able to help.

I keep getting this error when running this small program and I have absolutely no idea why:

??? Attempted to access vv(:,1); index out of bounds because size(vv)=[0,0].

Error in ==> interpstreamspeed at 104 spdi = interp2(x,y,spd,vv(:,1), vv(:,2));

if true
  % x and y values;
clc;
clear all;
x = -19.5:1:19.5;
y = 0.5:1:14.5;
[xgrid ygrid] = meshgrid(x,y);
A = 1;
sx = [-20:1:20];
sy =linspace(10,10,41)
% x Component;
u = A.*(xgrid);
% y Component;
v = A.*(-ygrid);
% Plotting Streamlines;
verts = stream2(xgrid,ygrid,u,v,sx,sy);
streamline(verts)
hold all;
% Plot straight thick lines;
h = plot(x,0,'*k');
set(h,'linewidth',2);
% Animate particles along streamlines;
iverts = interpstreamspeed(xgrid, ygrid, u, v, verts,0.01);
streamparticles(iverts,20,'Animate',2,'FrameRate',100);
end