ataias

module Poisson
#This is used to solve the system Ax = b in step 2
export poissonNeumannSparseSolver, getANeumannSparse, testPoissonNeumannSparse

function getANeumannSparse(n)
    spn = (n-2)*(n-2) #sparse n
    #Definir matriz A
    A = 4*speye(spn, spn)
    
    k=0

ataias

\ProvidesPackage{pgraphics}

\newcommand{\domainOne}[0]{
\begin{center}
\tikzstyle{help lines}+=[dashed]% 
\begin{tikzpicture}
%axes
\draw[->] (0,5) -- (xyz cs:y=6);
\draw (0,6.3) node {$y(j)$};
\draw[->] (5,0) -- (xyz cs:x=6);