how to do pitch modification?

i have recorded a sentence at three different levels normal,fast,slow.i have found the average pitch of these suppose for normal it is 146.84 ,fast 151.9811 and slow 141.5205 .i need 2 convert the normal to fast and slow and c how naturally it is converted when compared to originally recorded fast and slow.for this i divided 151.9811 by 146.84 which gives 1.034 which is the factor by which i need 2 convert normal to fast .now any1 pls help me with matlab code for converting the normal to fast using this factor of 1.034