Computes the exponential integral function for real arguments. The ei
function takes only a single argument
y = ei(x)
where x
is either a float
or double
array. The output
vector y
is the same size (and type) as x
.
The ei function is defined by the integral:
Here is a plot of the ei
function over the range [-5,5]
.
--> x = linspace(-5,5); --> y = ei(x); --> plot(x,y); xlabel('x'); ylabel('ei(x)');
which results in the following plot.