Problem with Graphs with MATLAB

I am very new to MATLAB, and am trying to plot a simple graph. I want MATLAB to integrate a function between 0 and an variable upper limit, and then plot the upper limit and value of integral on a graph. The programme works - I can see it generating the answers, but for some reason the graph doesn't plot. My very simple code is:

syms a f x y z

for x=0:0.1:1

func=a./(a.*0.3 + 8*10^-5 + (a.^4).*0.7)^0.5;

y=double(int(func,0,x))

plot(x, y,'r')

hold on

end

Obviously I am doing something wring, but cannot see what. Any help is gratefully received!

Mike

Answer 1

[KSSV]

syms a f x y z
x = 0:0.1:1 ;  % x values
y = zeros(size(x)) ;   % initialize y values
for i = 1:length(x)   % loop for each x 

func=a./(a.*0.3 + 8*10^-5 + (a.^4).*0.7)^0.5;

y(i) =double(int(func,0,x(i))) ;
end

plot(x, y,'r')

[mike halls]

Thanks very much for the very quick answer. I've made the changes, and get a graph. I can see what my error was. Thanks again.