Help plot

Hello,
I would like plot a vector and want to specify the Xticks which will be
displayed.  Is it possible ?
For example, suppose that x is a vector of length 3. I just want the
Xticks (and the corresponding labels)
for 1 2 and 3 to be displayed ( and not 1, 1.5, 2,2.5, ....) .

Thanks

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Olivier MARTIN
PhD student                  phone: (33) 04 76 61 53 55
Projet IS2                               06 08 67 93 42
INRIA Rhone-Alpes            fax  : (33) 04 76 61 54 77
655, Av. de l'Europe
Montbonnot                   e-mail:olivier.martin at inrialpes.fr
38334 Saint Ismier cedex
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