---
title: Matlab
tags: Applied_math_method
GA: G-77TT93X4N1
---

# Matlab

## Chebfun

x = chebfun('x', [0 pi]);
eps = 0.01;
f = exp(eps*sin(x));
sum(f)

## Contour

x = linspace(-3, 1, 1000);
ep = linspace(-0.01, 0.01, 1000);
[X, E] = meshgrid(x, ep);
f = (X+1).^3 - E.*X;
mesh(X, E, f)
f(f>0)=1;
f(f<0)=-1;
mesh(X, E, f)
contour(X, E, f)