Fitting line through data points

I want to fit the three intermediate series data seriesI have so that I will have long time series data. Each of the data contain 26 values(total of 78) at different time and I want to extend (fit) these data upto hTime= 25000.

The three data I have, which contains 26 values are in equation form

i-2.327+0.6.*(1:25) %% starts at time , tni= 11707

ii-1.492+ 0.46.*(1:25) %% starts at time , tmi= 16400

iii-1.2+ 0.3.*(1:25) %% starts at time , tgi= 23200

Here is the script I tried to work upon and failed.

   hTime=linspace(1,1,25000);
   time=linspace(1,1,25);

for rr= 1:length(time);

   tni= 11707; tmi=16400; tgi=23200;

   tnii=tni:(tni+24);tmii=tmi:(tmi+24);tgi=tgi:(tgi+24);     
    p=polyfit([tnii  tmii  tgi],[(2.327+0.6.*(rr))  (1.492+ 0.46.*(rr)) (1.2+ 0.3.*(rr))]); 
   [cofp,sts]=polyval(p,1:length(hTime));

end

Any help is highly appreciated.