what's wrong with this code?

Hi,i have an array named sumNy. the content of sumNy gives me Ny and the number of it's cells show me corresponding accelerations. now i have a specified Ny that is between two Ny s in my sumNy array, and i want to obtain it's corresponding acceleration.

i wrote this code but i dont know why it is not working and it gives me y=0 !

 for i=1:150
  if i==1
   y=0;
   elseif sumNy(1,i-1)<=(1/475) & sumNy(1,i)>=(1/475)
   y=(((1/475)-sumNy(1,i))/(sumNy(1,i-1)-sumNy(1,i)))*(i-1)+(1-(((1/475)- sumNy(1,i))/(sumNy(1,i-1)-sumNy(1,i))))*(i);
  end
 end

i must say that (1/475) is my specified Ny and there is two Ny s in my array that the specified Ny (1/475) place between them, so that is not why everytime i run this code it gives me y=0 !

please help me

Thanks

[Arman Kam]

and here is sumNy array

 sumNy=0.685079623000000  0.236606832000000  0.110267992000000  0.0572110040000000  0.0313797510000000  0.0180288710000000  0.0108257410000000  0.00677154700000000  0.00439156000000000  0.00293762700000000  0.00201682500000000  0.00141492900000000  0.00101064000000000  0.000732723000000000  0.000537897000000000  0.000399040000000000  0.000298677000000000  0.000225270000000000  0.000171029000000000  0.000130600000000000  0.000100237000000000  7.73000000000000e-05  5.98000000000000e-05  4.65000000000000e-05  3.62000000000000e-05  2.84000000000000e-05  2.22000000000000e-05  1.75000000000000e-05  1.38000000000000e-05  1.09000000000000e-05  8.65000000000000e-06  6.87000000000000e-06  5.47000000000000e-06  4.36000000000000e-06  3.48000000000000e-06  2.79000000000000e-06  2.24000000000000e-06  1.80000000000000e-06  1.45000000000000e-06  1.17000000000000e-06  9.44000000000000e-07  7.64000000000000e-07  6.20000000000000e-07  5.03000000000000e-07  4.09000000000000e-07  3.33000000000000e-07  2.72000000000000e-07  2.22000000000000e-07  1.82000000000000e-07  1.49000000000000e-07  1.22000000000000e-07  1.01000000000000e-07  8.27000000000000e-08  6.82000000000000e-08  5.62000000000000e-08  4.65000000000000e-08  3.84000000000000e-08  3.18000000000000e-08  2.64000000000000e-08  2.19000000000000e-08  1.82000000000000e-08  1.52000000000000e-08  1.27000000000000e-08  1.06000000000000e-08  8.82000000000000e-09  7.38000000000000e-09  6.18000000000000e-09  5.18000000000000e-09  4.34000000000000e-09  3.65000000000000e-09  3.07000000000000e-09  2.58000000000000e-09  2.18000000000000e-09  1.84000000000000e-09  1.55000000000000e-09  1.31000000000000e-09  1.11000000000000e-09  9.39000000000000e-10  7.96000000000000e-10  6.75000000000000e-10  5.73000000000000e-10  4.87000000000000e-10  4.15000000000000e-10  3.53000000000000e-10  3.01000000000000e-10  2.57000000000000e-10  2.19000000000000e-10  1.87000000000000e-10  1.60000000000000e-10  1.37000000000000e-10  1.17000000000000e-10  1.01000000000000e-10  8.64000000000000e-11  7.42000000000000e-11  6.38000000000000e-11  5.49000000000000e-11  4.72000000000000e-11  4.07000000000000e-11  3.51000000000000e-11  3.03000000000000e-11  2.61000000000000e-11  2.26000000000000e-11  1.95000000000000e-11  1.69000000000000e-11  1.46000000000000e-11  1.27000000000000e-11  1.10000000000000e-11  9.52000000000000e-12  8.27000000000000e-12  7.18000000000000e-12  6.25000000000000e-12  5.43000000000000e-12  4.73000000000000e-12  4.12000000000000e-12  3.59000000000000e-12  3.13000000000000e-12  2.73000000000000e-12  2.39000000000000e-12  2.08000000000000e-12  1.82000000000000e-12  1.59000000000000e-12  1.40000000000000e-12  1.22000000000000e-12  1.07000000000000e-12  9.39000000000000e-13  8.24000000000000e-13  7.23000000000000e-13  6.35000000000000e-13  5.58000000000000e-13  4.91000000000000e-13  4.32000000000000e-13  3.80000000000000e-13  3.35000000000000e-13  2.95000000000000e-13  2.60000000000000e-13  2.29000000000000e-13  2.02000000000000e-13  1.79000000000000e-13  1.58000000000000e-13  1.39000000000000e-13  1.23000000000000e-13  1.09000000000000e-13  9.65000000000000e-14  8.54000000000000e-14  7.57000000000000e-14  6.71000000000000e-14  5.95000000000000e-14  5.28000000000000e-14  4.68000000000000e-14  4.16000000000000e-14

[Arman Kam]

one can see (1/475) is between 10th and 11th value.

Answer 1

[Arman Kam]

sorry friends, i just find out my horrible mistake!

but still if you have a better way to do this please tell me