
From:  Brett Green 
Subject:  Re: Plotting an ELU function with GNU Octave 
Date:  Thu, 4 Feb 2021 14:43:00 0500 
Hello,
I am trying to create plots for an ELU (Exponential Liniear Unit)
funciton. The function is defined as follows:
function e = elu(z, alpha)
if z >= 0
e = z
else
e = alpha * ((exp(z))  1)
endif
endfunction
So this is pretty simple so far (alpha is a constant of values 0.01),
and I can test to evaluate it in the interpreter and everything is
working as expected.
However, I want to plot the values of elu(x), where x belongs to the
interval (5, 5).
function plot_elu
x = 5:0.01:5
y = elu(x, 0.01)
plot(x, y, "linewidth", 5)
set(gca,"fontsize", 25)
axis([6, 6, 1.2, 1.2])
grid on;
endfunction
This is where the plot goes wrong: it creates the plot as if the values
for elu are all going on the second branch of the ifthenelse
statement.
I have attached what the plot looks like. Any help in this direction is appreciated.

Alexandru Munteanu
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