# How do I get the equation and display on the graph for line of best fit?

5 views (last 30 days)
Sujala Swaminathan on 2 Jul 2020
Edited: Ameer Hamza on 2 Jul 2020
x=[0.200 0.100 0.067 0.050 0.040 0.033 0.025];
y=[0.214 0.158 0.130 0.125 0.136 0.115 0.107];
axis([0 0.025 0 0.025]);
plot(x,y,'x');
hold on
title('lineweaver-burk plot');
xlabel('1/S');
ylabel('1/Vo ');
figure(2)
scatter(x,y);
%Plotting the line of best fit
p=polyfit(x,y,1);
x1=linspace(min(x), max(x), 100);
y1=polyval(p,x1);
plot(x1,y1,'r-', 'LineWidth',3);
X_int = roots (p);
y_int = p(2);
hold off

Ameer Hamza on 2 Jul 2020
Edited: Ameer Hamza on 2 Jul 2020
Try this
x=[0.200 0.100 0.067 0.050 0.040 0.033 0.025];
y=[0.214 0.158 0.130 0.125 0.136 0.115 0.107];
axis([0 0.025 0 0.025]);
plot(x,y,'x');
hold on
title('lineweaver-burk plot');
xlabel('1/S');
ylabel('1/Vo ');
fig = figure(2);
ax = axes();
scatter(x,y);
%Plotting the line of best fit
p=polyfit(x,y,1);
x1=linspace(min(x), max(x), 100);
y1=polyval(p,x1);
plot(x1,y1,'r-', 'LineWidth',3);
X_int = roots (p);
y_int = p(2);
eq_str = sprintf('y = %.2fx + %.2f', p);
text(min(x)+0.02, max(y)-0.01, eq_str, ... % An example of setting the position
'FontSize', 16)