how to save for loop data

I have a script that is calling from an excel file and interpolating the data in a for loop. The result is stored in the variable 'interamp' and i just need to know how to save the data with each iteration of the loop, before it is overwritten.

filename = 'sample file.xlsx';

data = xlsread(filename);

[rows, columns] = size(data);

dAmp = []; % holds amp for each trialFFTamp

dPhz = []; % holds phz for each trial

ctr = 1;

for col = 1 : 2 : columns

      x = data(:, col);
      y = data(:, col + 1);
      hold on;

[xData, yData] = prepareCurveData(x, y);

% Set up fittype and options.

ft = 'linearinterp';

% Fit model to data.

[fitresult, gof] = fit( xData, yData, ft );

InterAmp = fitresult(0:0.9765625:999);

end

Answer 1

[KSSV]

 I = 1:2:columns ;
 N = length(I);
iwant = cell(N,1) ;
 for i = 1:N
      col = I(I) ;
        x = data(:, col);
        y = data(:, col + 1);
        hold on;
  [xData, yData] = prepareCurveData(x, y);
  % Set up fittype and options.
  ft = 'linearinterp';
  % Fit model to data.
  [fitresult, gof] = fit( xData, yData, ft );
  InterAmp = fitresult(0:0.9765625:999);
iwant{i}= InterAmp;
  end