plot and then plot the same graph with filled area

Greetings all,

I am working on developing a code to polt a curve then plot another code for the same curve with area underneath filled. my cose is as follow:

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

the first plot is OK but the second is not

Answer 1

[KSSV]

x = linspace(0,2*pi) ; 
w = @(x) x.*exp(-x).*cos(x) ; 
y = w(x) ; 
figure
plot(x ,y)

figure;
area(x,y)