3D Heart in Matlab

[saikumaryadavpappaka]

How did you find that equation brother?

[dieplamtuyet]

I wrote everything the same but matlab doesn't work, another shape got shown. Please help me. thanks (p/s I use matlab R2018a)
clear;
close all;
clc;
step=0.05;
[x, y, z]=meshgrid(-3:step:3, -3:step:3, -3:step:3);

p=patch(isosurface(x, y, z, F, 0));
set(p, 'facecolor', 'w', 'EdgeColor', 'r');
daspect([1 1 1 ]), view(3), axis tight, axis equal, grid on;
title('Red Heart');