update visualize.Rmd

git-svn-id: http://wwwadmrep6.rap.raftel/cmn/010_PEUnit/010_%E6%8A%80%E8%A1%93%E6%94%AF%E6%8F%B4/070_%E3%83%87%E3%83%BC%E3%82%BF%E9%9B%86%E8%A8%88%E5%9F%BA%E7%9B%A4%E3%83%97%E3%83%AD%E3%82%B8%E3%82%A7%E3%82%AF%E3%83%88/keymans_54-4q@4392 e0942607-3b7c-442e-bd90-617d8c4747b3