How can I create a single column

load('Bob05.mat');
for i=87:9:613
    Type=Bob05.cycle(i).type;
    if strcmp(Type,'impedance')==1
         Temperature_measured=Bob05.cycle(i).data.Temperature_measured;
         plot(Bob05.cycle(i).data.Temperature_measured);
         hold on;
    end

end

i have 600 cycles of battery now i have to plot graph (x, y) but i have y axis data i.e. "Bob05.cycle(i).data.Temperature_measured" now for x axis i have to calculate it by formula and that output i wanna plot how to do that?