MATLAB: Finding the Y value corresponding to X value in a parametric plot

parametricplot

how do i find the value of Y when X= 1360 for every loop? X and Y gives a matrix. s is a random number for each loop
smax=0.4;
smin=0.1;
S=smin+rand(1,n)*(smax-smin);
S_cumulative=cumsum(S);
  n= 3200;
  R=200.04;
  V=30;                  
  v=20000;  
  i=1;
   while i<n
       t= linspace (0,50,100000);
         X=R*sind((v*t/(R))+(V*(t))+S_cumulative(i);
         Y=-R*cosd((v*t/R));
    end
    i=i+1;

Best Answer

If all your curves have the same timestep and same number of measurements why not put them all together in a matrix and then find the minimum? For example,
allY = rand(10,4); %say, you have 4 curves with 10 values (random data in this example)
X = (1:10)';
data_summary = [X allY] %put them together
intvl = 3:6; %in your case 1360 to 1400
minVals = min(data_summary(intvl,2:end))
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