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How can I plot two functions in the same graph?

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Íris
Íris 2014-9-17
评论： Raul Galdeano Pazos 2022-2-19
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?
  1 个评论
Raul Galdeano Pazos
Raul Galdeano Pazos 2022-2-19
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.

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采纳的回答

Mischa Kim
Mischa Kim 2014-9-17
Iris, use
x = -3:0.1:3;
f = x./10;
g = cos(x);
plot(x,f,x,g)
  4 个评论
显示 2更早的评论
Shubhashree Bal
Shubhashree Bal 2018-2-19
how can someone plot two graphs with different baseline on single graph plot?
rockstar49
rockstar49 2020-10-25
Using this way to plot multiple functions, how can you use the legend on function to differenitate between each line?

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更多回答（3 个）

Aayushii Goswami
Aayushii Goswami 2017-10-21
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?
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
Nilankan Pal
Nilankan Pal 2021-5-13
x = -3:0.1:3;
f = x./10;
g = cos(x);
plot(x,f,x,g)

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