Plotting function with differenting constant

Hi,

I'm pretty unexperienced with Matlab so pls bear with me:

I'm trying to plot the function

y=a/(x+1)-(a-x)^2+x/(x+a)

when a is a vector of

a=[1,2,3,50,300]

so I put it in the loop:

for i=1:length(a)

ai=a(i);

y{i}=@(x) (ai/(x+1)-(ai-x)^2+x/(x+ai));

fplot(y{i});

end

but I get just one graph (of ai=300) and tons of yellow warnings..

any comments?

Answer 1

[Voss]

a=[1,2,3];%,50,300];                            % using just the first 3 a values, for this demonstration
for i=1:length(a)
    ai=a(i);
%     y{i}=@(x) (ai/(x+1)-(ai-x)^2+x/(x+ai));
    y{i}=@(x) (ai./(x+1)-(ai-x).^2+x./(x+ai));  % using element-wise operations (./ and .^) to vectorize
    fplot(y{i});
    hold on                                     % using hold on to show multiple lines at once
end

[Efrat Hazan Elimelech]

thanks a lot!

[Voss]

You're welcome!

Answer 2

[Torsten]

Include the command

hold on

after the line

fplot(y{i});

such that preceeding graphs are not overwritten.