In [4]:
using Plots

This cell is just raw text! You can type whatever you want. It's a good way to insert documentation and explain what is going on.

In this code,

In [5]:
""" Create the hilbert matrix, which is a highly ill-conditioned matrix. """
function hilb(n)
    A = zeros(n,n)
    for i=1:n
        for j=1:n
            A[i,j] = 1./(i+j-1.)
        end
    end
    return A
end
Out[5]:
hilb (generic function with 1 method)
In [6]:
N = 10
condnums = zeros(N)
for n=1:N
    condnums[n] = cond(hilb(n))
end
In [7]:
# plot(condnums) # the start
plot(condnums)
yaxis!(:log10)
xlabel!("Matrix size: n")
ylabel!("Condition number")
title!("The condition number of the Hilbert matrix")
[Plots.jl] Initializing backend: pyplot
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Out[7]:

In [9]:
savefig("hilb-cond.pdf")