MATLAB: Index exceeds the number of array elements (1).

compressed sensingreconsrtuction error

Can anybody please help why I am getting this error. I am unable to figure out what I am doing wrong in this code.
I am getting this error [ndex exceeds the number of array elements (1).
Error in trial (line 132)
    xhat(i)= d1+d2*x_rec(i-1)+d3*y_rec(i-1)+d4*x_rec(i-1)*y_rec(i-1)+d5*x_rec(i-1)^2+d6*y_rec(i-1)^2+d7*x_rec(i-1)^2*y_rec(i-1)^2+d8*x_rec(i-1)^2*y_rec(i-1)+d9*x_rec(i-1)*y_rec(i-1)^2+d10*x_rec(i-1)^3+d11*y_rec(i-1)^3+d12*x_rec(i-1)^3*y_rec(i-1)+d13*x_rec(i-1)*y_rec(i-1)^3+d14*x_rec(i-1)^3*y_rec(i-1)^2+d15*x_rec(i-1)^2*y_rec(i-1)^3+d16*x_rec(i-1)^3*y_rec(i-1)^3; 
>> ]

Best Answer

Repalce with this the for loop. 
for i=2:length(x_rec)
    xhat(i)= d1+d2*x_rec(i-1)+d3*y_rec(i-1)+d4*x_rec(i-1)*y_rec(i-1)+d5*x_rec(i-1)^2+d6*y_rec(i-1)^2+d7*x_rec(i-1)^2*y_rec(i-1)^2+d8*x_rec(i-1)^2*y_rec(i-1)+d9*x_rec(i-1)*y_rec(i-1)^2+d10*x_rec(i-1)^3+d11*y_rec(i-1)^3+d12*x_rec(i-1)^3*y_rec(i-1)+d13*x_rec(i-1)*y_rec(i-1)^3+d14*x_rec(i-1)^3*y_rec(i-1)^2+d15*x_rec(i-1)^2*y_rec(i-1)^3+d16*x_rec(i-1)^3*y_rec(i-1)^3;
end
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