newkrystal

Thank you. As I want to show the the transition from non-linear to linear region, I want to plot the whole data. However, for the fit, I only want the fit to cover the specified range on the plot (like what we do in excel). I was wondering how we can do that.

Yes, the equation should be y=ax+b. we could not just set the intercept to be zero, which is not possible to fit the linear region in the data set. Also, when I make the plot, how can I plot the whole data set and the fit which is only from [800:*].? The range in the plot function applies to both the data and the fit. I could not specify the range for each of them. Thank you.

Thank you. I just have one more question. How can I plot the whole data set and plot the fitted line within a specific region? If I specify the range in the plot function, the range applies for both data set and the fit.

screenshot below

Hello, I want to do the linear fitting for my data within a specific range . So, I used f(x) = a*x fit [800:1400] f(x) "filename" using 1:2 via a. However, it seems to me that the fitting line does not fit well to the range that I specified. Could you help clarify this? I have attached the screenshot below. Thank you.