Hi guys: I have a program which is supposed to fit x- and y-data to a certain function and give me the optimum parameters. This is no problem. What I want to do though is to perform a for loop that allows me to plot the CHANGE in those parameters over time (as I conduct a real life experiment). The code is something like this (an example): for i=1:5 pause(1) execute_function; [estimates, model] = fitcurvedemo(xdata, ydata) end The output will give me five iterations of the fitted parameters (which I have a separately written program for which works), but I want to collect them into a single column and plot them against the time (i), which in this case is 1 second intervals. I hope this is clear. Thanks.