How can I plot two functions in the same graph?

I have to show that the functions f(x)=x/10 and g(x)=cos(x) intersect at least twice the range [-3,3]. Can anybody help me?

[Raul Galdeano Pazos]

Hi Íris!

In my view, there are two ways of tackling this problem. Firstly, doing this;

%------------------------------------------------------------------------------------------------------------------------------------------------------------

x = -3:0.1:3;

y1 = x/10;

y2 = cos(x);

%Firstly, just plot one single function;

figure(1)

plot(x,y1,"r-","Linewidth",2);

hold on

%Then, plot the rest of the functions;

plot(x,y2,"b-","Linewidth",2);

I think this way of plotting, despite having more lines of code, works too!

I hope this could help you!

R.G.

Answer 1

[Mischa Kim]

Iris, use

 x = -3:0.1:3;
 f = x./10;
 g = cos(x);
 plot(x,f,x,g)

[Íris]

Thanks that helped!

[Marios Levi]

a smile sent your way :)

[Shubhashree Bal]

how can someone plot two graphs with different baseline on single graph plot?

[rockstar49]

Using this way to plot multiple functions, how can you use the legend on function to differenitate between each line?

Answer 2

[Aayushii Goswami]

I have to sketch the graph of y^2=8x and x^2=8y on the same axis system and shade the bounded area.can anyone pls help me?

Answer 3

[Realeboha Ramoeletsi]

t=linspace(0.2,50,100);

alpha=0.5;

c1=2;

r=0.2;

sigma=0.25;

Nt=1600;

Ns=160;

Smax=20;

Smin=0;

T=1.;

E=10;

dt=(T/Nt);

ds=(Smax-Smin)/Ns;

V(1:Ns+1,1:Nt+1)=0.0;

S=Smin+(0:Ns)*ds;

tau=(0:Nt)*dt;

V(1:Ns+1,1)=max(S-E,0);

V(1,1:Nt+1)=0;

V(Ns+1,1:Nt+1)=Smax-E*exp(-r*tau);

y1=C(t,alpha,c1);

figure(1)

plot (S,V(:,1),'r-',S,V(:,round(Nt/2)),'g-',S,V(:,Nt+1),'b-');

plot(t,y1,'-r')

xlabel('S')

ylabel('V(S,tau)')

for j=1:Nt

for n=2:Ns

V(n,j+1)=0.5*dt*(sigma*sigma*n*n-r*n)*V(n-1,j)+(1-dt*(sigma*sigma*n*n+r))*V(n,j)+0.5*dt*(sigma*sigma*n*n+r*n)*V(n+1,j);

end

end

function y=C(t,alpha,c1)

if ~all(t>0)

error(" t values must be positive")

end

if alpha<0 || alpha>1

error("alpha must be in the range (0,1) excluding both ends")

end

y=c1*t.^(alpha-1)./gamma(alpha);

end

i have two functions y and V and i did plot them separately one on its plot, so i am having a problem on ploting the same fuctions in one figure, can someone help me please. thank you.

i have attached .m file

Answer 4

[Nilankan Pal]

 x = -3:0.1:3;
 f = x./10;
 g = cos(x);
 plot(x,f,x,g)