Linear fit of the points

Hello, I got a plot (attached). Suppose the plot is simply from:

plot (x,y);

How can I get a linear least squares fit for these three points (they are actually not on one line) and then get the specific x values on the fit when I give certain y values, for example:

2.5:0.025:2.55

Thank you very much!

Answer 1

[Star Strider]

Probably the easiest way is to use polyfit and polyval. Use an order 1 polynomial to get a straight-line fit.

EDIT— To get the x-values for y-values using polyfit for a straight-line fit, this will work:

b = polyfit(x, y, 1);
x = (y-b(2))/b(1);

[James Lorringer]

Thank you!

[Star Strider]

My pleasure!