How I can separate the data points by line?

I have made this cross plot between resistivity and porosity and color-coded by gas hydrate saturation. I need to separate the data points with a hydrate saturation of less than 20% by line.

[Star Strider]

How does ‘hydrate saturation’ relate to the data in the plot?

Answer 1

[Matt J]

You could use fitclinear. To illustrate, I will use fabricated data:

%synthetic data
N=500;
Resistivity=rand(N,1);
Porosity=rand(N,1);
Saturation=vecnorm([Porosity,Resistivity],2,2);


%classify
labels=Saturation<0.2;
mdl=fitclinear([Porosity,Resistivity],labels);


%plot
scatter(Porosity,Resistivity,50, Saturation,'filled'); colormap cool; colorbar
ax=axis;
hold on;
  fimplicit(@(x,y)x*mdl.Beta(1)+y*mdl.Beta(2)-mdl.Bias,'LineWidth',3,'Color','k');
hold off
axis(ax*1.2-0.1)