You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: test_plotting.m
    path of file: ./repos/chebfun/tests/diskfunv
    
    the code of the file until where you have to start completion: function pass = test_plotting( pref )
% Check that the very basic plotting commands do not crash in diskfunv

F = grad(diskfun(@(x,y) x.*cos(y)));
try
    hold off
    quiver(F),         j = ishold;
    close all

    
function pass = test_plotting( pref )
% Check that the very basic plotting commands do not crash in diskfunv

F = grad(diskfun(@(x,y) x.*cos(y)));
try
    hold off
    quiver(F),         j = ishold;
    close all
    if ( j == 0 )
        pass(1) = 1;
    else
        pass(1) = 0;
    end