Drawing a line to divide two parts of a curve

Hello,

How can I draw a vertical line in a curve to divide two parts of the curve and color the first part?

Thanks in advance,

Answer 1

[Star Strider]

Try this —

x = linspace(0, 20);
y = (1-exp(-0.1*x));
xq = 10;
yq = interp1(x,y,xq)

yq = 0.6321

figure
plot(x, y)
hold on
plot([1 1]*xq, [0 yq])                                                                  % Vertical Line
Lv = x<=xq;
patch([x(Lv) fliplr(x(Lv))], [zeros(1,nnz(Lv)) fliplr(y(Lv))], 'g', 'FaceAlpha',0.5)    % Shaded ARea
hold off

Experiment with my code and your data

.

Answer 2

[Dave B]

You can draw a vertical line very easily with xline

area works well for filling a part of the curve

x=linspace(-3,3,100);
y=exp(-x.^2);
hold on
cutoff=.35;
area(x(x<cutoff),y(x<cutoff),'FaceAlpha',.2,'EdgeColor','none')
plot(x,y,'LineWidth',2)
xline(cutoff,'LineWidth',2,'Label',"The Value is " + cutoff,'LabelOrientation','horizontal')

Answer 3

[Nour BS]

THANK YOU VERY MUCH !! =D