Area fill under a curve

Greetings all,

I created a code to plot the function w = x*e^x*cos(x) in the domin (0.2pi). I have to create two plots. one by using the function fplot, and then another graph with fill in under the curve. my code is as follow:

w = @(x) x.*exp(-x).*cos(x) , [0,2*pi];

fplot(w , [0,2*pi])

figure

area(w)

what is wrong here?

regards

Answer 1

[Simon Chan]

Check the MATLAB documentation about area.

w is a function handle and it is not supported.

Try the following:

x=linspace(0,2*pi,100);
y=x.*exp(-x).*cos(x);
figure
area(x,y)

Answer 2

[Star Strider]

For the fill plot, use the data that fplot has already created —

w = @(x) x.*exp(-x).*cos(x);

hfp = fplot(w , [0,2*pi]);                                                  % Return Object Handle

figure
area(hfp.XData, hfp.YData)                                                  % Access Properties

.