how to plot the graph y={1}/{1+10^{x/400}}

Im completely new to matlab. i want to plot the graph y={1}/{1+10^{x/400}} to show what happens when x tends to minus infinity and infinity is this possible.

Answer 1

[Ameer Hamza]

You can plot it over a large range to see the trend

x = linspace(-1000, 1000);
y = @(x) 1./(1+10.^(x/400));

plot(x, y(x))

You can also put the value at infinity

>> y(inf)
ans =
     0
>> y(-inf)
ans =
     1

If you have symbolic toolbox

syms x
y = 1/(1+10^(x/400));
fplot(y, [-1000 1000])

And find the limits

>> limit(y, x, inf)
ans =
0
>> limit(y, x, -inf)
ans =
1