How to find the slope of regression between two sets of data and save the scatter plot as fig

a=load(a) S=load(S) T=load(T)

aa= find(a>=0 & a <0.2); x1 = S(aa); y1 = TB(aa); scatter(x1,y1,'MarkerFaceColor','g','MarkerEdgeColor','g');

bb= find (a>=0.2 & a <0.4); x2 = S(bb); y2 = T(bb); figure; hold on; scatter(x2,y2,'MarkerFaceColor','b','MarkerEdgeColor','b');

Answer 1

[Star Strider]

Use the polyfit function. Since you mention ‘slope’, you would need to use a linear (first-degree polynomial).

Assuming you want to do a regression between ‘x2’ and ‘y2’, this will work:

p = polyfit(x2, y2, 1);
slope = p(1);

Here ‘p’ is the parameter vector.

[Hana]

Thanks for your reply.How can i save the scatterplot as fig?

[Star Strider]

My pleasure.

Use the savefig function.