Code display blank plot

My code is calculating a non-linear equation system with Newton-Rhapson method, and I'm trying to show a plot of "iterration"(i) as function of "error vector"(h1).

Maybe because i is scalar and h1 is a vector?

How can i fix the code for making a plot like i want?

syms x y z

u = (x*y)-z^3-2;
v = (x*y*z)-x^2+y^2-4;
w = exp(x)-exp(y)+cos(z)-6;
xo = 1;yo = 1;zo = 1;
k = 10;
i = 0;
a = jacobian([u;v;w],[x,y,z]);

while i<k	
	j=subs(a,[x,y,z],[xo,yo,zo]);
	j_i=j^-1;
	
	uo=subs(u,[x,y,z],[xo,yo,zo]);
	vo=subs(v,[x,y,z],[xo,yo,zo]);
	wo=subs(w,[x,y,z],[xo,yo,zo]);
	
	sol=[xo;yo;zo]-j_i*[uo;vo;wo];
	sol=double(sol);
	
	x1=sol(1,1);
	
	h1=j_i*[uo;vo;wo];
	
	xo=sol(1,1);
	yo=sol(2,1);
	zo=sol(3,1);
	
	i=i+1;
	
	plot(i,h1,'r');
	hold on
	xlabel('Error Vector')
	ylabel('Iterration')
end

X=xo;
Y=yo;
Z=zo;

X,Y,Z

[dpb]

Probably just that a single pixel is too small to show up on the screen...try

plot(i,h1,'rx','markersize',3);

[Omer Yaish Maman]

Thank you very musch that was helpful

Answer 1

[Image Analyst]

Try this:

plot(1 : length(h1), h1, 'r.', 'MarkerSize', 15);
grid on;
hold on
drawnow;

or simply

plot(h1, 'r.', 'MarkerSize', 15);
grid on;
hold on
drawnow;

[Image Analyst]

Glad changing the markersize fixed it for you.