Array indices must be positive integers or logical values

When I try to save the "t" and "v" values into the x(i) and y(i) vectors, I keep getting th same mistake. "Array indices must be positive integers or logical values."

Im trying to save tha value of each itiretation so I can plot all of them, anyone got another solution for this?

clc;

clear;

clc;

h=.12

rtanque=.1

rsalida=.005

g=9.806;

for i = (h:-.01:.00001)

Vol=(pi.*rtanque.^2).*i;

v=(2.*g.*i).^(1/2)

Q=(2.*(pi.*rsalida.^2)).*v;

t=Vol/Q

x(i)=t

y(i)=v

end

plot(x,y);

xlabel('Tiempo en [s]')

ylabel('Velocidad en [m/s]')

title('Gráfica Velocidad vs Tiempo')

grid on;

hold on;

Answer 1

[VBBV]

clc;
clear;
clc;
h= linspace(0.00001,0.12,12)
rtanque=.1
rsalida=.005
g=9.806;
for i = 1:length(h)	
	Vol=(pi.*rtanque.^2).*i;	
	v=(2.*g.*i).^(1/2)	
	Q=(2.*(pi.*rsalida.^2)).*v;
	t=Vol/Q	
	x(i)=t
	y(i)=v	
end
plot(x,y);
xlabel('Tiempo en [s]')
ylabel('Velocidad en [m/s]')
title('Gráfica Velocidad vs Tiempo')
grid on;
hold on;

[Mikel Gonzalez Bribiesca]

Thank you so much!

Would there be a way to make the loop start from h until 0 (or almost 0). The program is supposed to measure the time it takes for a bucket of water to drain, so that would make a bit more sense. But thank you a lot.