plotting - field from a structure

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I have the following code in which I fill a structure and then try to plot one of the fields of the structure.

returnProfile = struct('totalReturn',{});
j =0;
for i = 16:8:104
    j = j+1;
    returnProfile(j,1) = maLong(i/2,i,i/8,i/4);
    y(j,1) = i;
end
plot(returnProfile(:).totalReturn,y(:,1));

#*The plot doesn't show anything. am not sure why?* y is an array should "returnProfile(:).totalReturn" be an array i dont see any reason why the plot should not work. all elements are generated as:

   y(:,1)
ans =
      16
      24
      32
      40
      48
      56
      64
      72
      80
      88
      96
     104
  >> returnProfile(:).totalReturn
ans =
      1.6862
ans =
     -8.8583
ans =
      3.3551
ans =
     -4.0201
ans =
     -5.0018
ans =
    -25.9340
ans =
     15.1983
ans =
    -10.6162
ans =
     15.5172
ans =
      4.4779
ans =
    -11.4196
ans =
    -23.1088