plot not displaying figure

how can i plot func between the interval below , i don't have an image of the function anymore but the exact way the function was given was sin(3*x^2) , i'm not receiving any errors just a blank figure

x=-23:.1:23;

func=sin(3*x.^2);

plot(x,func);grid on;axis tight;

[Bob Thompson]

The code you posted worked fine for me. Is there some additional code you have with this? Perhaps the issues lies there.

Answer 1

[madhan ravi]

shg % at the end perhaps?

[Opariuc Andrei]

%% function s=sin(3*x^2)

x=-23:.1:23;

func=sin(3*x.^2);

plot(x,func);grid on;axis tight;

subplot(2,2,1);title('func=sin(3*x^2)')

%% circle

t=0:.01:2*pi; x=3*cos(t); y=3*sin(t);

subplot(2,2,2);plot(x,y);grid on; title('r=3');hold on;

%% cone

R =10; r=5;H =5;

N = 500;

[x, y, z] = cylinder([r R], N);

subplot(2, 2 ,3)

meshc(x, y, H*z);title('con mesh');xlabel('x');ylabel('y');zlabel('z/H');

%% triangle

t=[-30*pi/180 pi/2 210*pi/180 -30*pi/180];

xt=20/sqrt(3)*cos(t); yt=4/sqrt(3)*sin(t);

subplot(2,2,4);plot(xt,yt);grid on;axis tight;title(' triunghi cu l=20');

this is the entire plotting requirement , 3/4 work fine but the function isn't displaying anything

[Bob Thompson]

You need to switch the order of your subplot call out, and the plot of func.

subplot(2,2,1);title('func=sin(3*x^2)')
plot(x,func);grid on;axis tight; 

The way you have it, it's creating the plot first in Fig(1), then overwriting with the 2x2 subplot.

[Opariuc Andrei]

also how do i use shg ? i use it in command window ?

[Opariuc Andrei]

ok so i did it without the subplot and it works ,but the figure is supposed to be there in the top left corner , it's a requirement , i tweaked it's position to (2,2,2/3/4) and still no display , how can i make it function ?

[Opariuc Andrei]

ok so i moved the subplot 2 lines up and put it before the plot and got it to work

x=-23:.1:23;

func=sin(3*x.^2);

subplot(2,2,1);

plot(x,func);grid on;axis tight;

title('func=sin(3*x^2)');