Hello all,
I am a material engineering student and we have to analyse x-ray diffraction data. What happens with this type of analysis is that the data have a baseline, that must be removed for correct analysis. The image below demonstrates such line (all above zero and a slight upwards shift on left side...though sometimes can be a lot worse!).
What we do is, in Microsoft Excel, just select various points throughout the data (NOT ON ANY OF THE PEAKS, just the "flat" parts) and plot a graph with those selected points, determine it's function by trendline (whatever fits best...polynomial, power function...), create a column with f(x) values and subtract from our original y values.
Once this function is determined, we plot the "new" y values
As you can see, no more baseline (flat parts are at approximately zero, and no upward tendency towards the left).
I want to be able to plot using MATLAB, and have no difficulties doing such. However, when it comes to removing the baseline, I still have to use MS Excel to find a suitable fuction in MATLAB...is there anyway I could do that directly in MATLAB? Or is it easier to carry on doing in Excel, and just copying the function? Any help is greatly appreciated and I can clarify any confusion, thanks.
