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From: Berend on 30 May 2010 15:45
"Mathew Thomas" <mathew99(a)gmail.com> wrote in message <htuecg$lc2$1(a)fred.mathworks.com>...
> Hey,
>
> I meant:
> All the sample points that lie 'exactly' on the line between these two given points. Hope this makes it clear.
>
> Thanks,
>
> Mathew

a very crude code to get the ones that exactly lie on this line is:

a=[200,80];
b=[220,110];

x=[a(1) b(1)];
y=[a(2) b(2)];

X=a(1):b(1);
Y=interp1(x,y,X)
r=round(Y);
t=Y./r-1;
v=find(t==0);
X=X(v)
Y=Y(v)
From: Matt J on 30 May 2010 15:55
"Mathew Thomas" <mathew99(a)gmail.com> wrote in message <htuen7$cjv$1(a)fred.mathworks.com>...
> Thats exactly what I needed.
>

If you mean that the solution provided by Bernd was what you needed, that's good, but that solution does not givethe points that lie *exacly* on the line. You seem to be requesting contradictory things.
From: Matt J on 30 May 2010 16:03
"Mathew Thomas" <mathew99(a)gmail.com> wrote in message <htuecg$lc2$1(a)fred.mathworks.com>...
> Hey,
>
> I meant:
> All the sample points that lie 'exactly' on the line between these two given points.
=================

If you really do mean "exactly", then something like this is what you want

a=[0;0];
b=[10;6];

dX=b(1)-a(1);
dY=b(2)-a(2);

G=gcd(dX,dY);

dxy=round([dX;dY]/G);

AllPoints=round( bsxfun(@plus,a,dxy*(0:G)) );
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