Project - Data Handling and Interpolation

fileID = fopen('interpolation.txt','w');        % Open the text file to write the output

x = ImAmp;                                      % defining a variable x from excel file
y = VVolt;                                      % defining a variable y from excel file
xq = [-17.3:0.1:0.9];                           % defining the range for interpolation
xq1 = interp1(y,x,xq);                          % interpolation 
figure(1);
plot(x,y,'o',xq,xq1,':');                       % plotting the interpolation
grid;

fprintf(fileID,'%f','xq1');