{"id":3758,"date":"2016-06-08T15:51:11","date_gmt":"2016-06-08T19:51:11","guid":{"rendered":"https:\/\/blogs.mathworks.com\/community\/?p=3758"},"modified":"2016-06-08T15:58:01","modified_gmt":"2016-06-08T19:58:01","slug":"national-jelly-filled-doughnut-day","status":"publish","type":"post","link":"https:\/\/blogs.mathworks.com\/community\/2016\/06\/08\/national-jelly-filled-doughnut-day\/","title":{"rendered":"National Jelly-Filled Doughnut Day"},"content":{"rendered":"

National Doughnut Day was June 3rd. On that day, Sean Breckling<\/a> was nice enough to tweet this to the universe of MATLAB users:<\/p>\n

https:\/\/twitter.com\/BikeMath\/status\/738818666448314369<\/a><\/p>\n

\"doughnut_day_1\"
\nI sampled his code (below) and found it delicious, although it had a slight metallic taste (note the copper colormap).<\/p>\n

    X = imread('sprinkles.jpg'<\/span>);\r\n    t = 0:0.01:1;\r\n    nt = max(size(t));\r\n           \r\n    outside = 2 + sqrt(1 - t.*t);\r\n    inside = 2 - sqrt(1 - t.*t);\r\n    \r\n    [x,y,z] = cylinder(outside);\r\n    [xx,yy,zz] = cylinder(inside);\r\n    \r\n    surf(x,y,z,    'LineStyle'<\/span>, 'none'<\/span>, 'FaceColor'<\/span>, 'texturemap'<\/span>,'EdgeColor'<\/span>,'none'<\/span>);\r\n    hold on<\/span>\r\n    surf(x,y,-z,   'LineStyle'<\/span>, 'none'<\/span>, 'FaceColor'<\/span>, 'texturemap'<\/span>,'EdgeColor'<\/span>,'none'<\/span>);\r\n    surf(xx,yy,zz, 'LineStyle'<\/span>, 'none'<\/span>, 'FaceColor'<\/span>, 'texturemap'<\/span>,'EdgeColor'<\/span>,'none'<\/span>);\r\n    surf(xx,yy,-zz,'LineStyle'<\/span>, 'none'<\/span>, 'FaceColor'<\/span>, 'texturemap'<\/span>,'EdgeColor'<\/span>,'none'<\/span>);\r\n    axis tight<\/span> equal<\/span> off<\/span>;\r\n    colormap('copper'<\/span>);\r\n    warp(x,y,z,X)\r\n    warp(xx,yy,zz,X)\r\n    hold off<\/span>\r\n<\/pre>\n
\"doughnut_day_2\"<\/p>\n
Sorry it took me a while to notice your tweet, Sean. I may be too late to wish you a Happy National Doughnut Day, but by a
\nfortunate coincidence, today is National Jelly-Filled Doughnut Day (strange but true!). So Happy National Jelly-Filled Doughnut
\nDay!<\/p>\n
In honor of this occasion, here is a doughnut-themed Cody problem: Would Homer Like It?<\/a><\/p>\n
And finally, through the magic of spherical coordinates, we’ll close with a gratuitous animation. Because doughnut. Mmmm… doughnut.<\/p>\n
\"doughnut_day_3\"<\/p>\n","protected":false},"excerpt":{"rendered":"
<\/div>\n
National Doughnut Day was June 3rd. On that day, Sean Breckling was nice enough to tweet this to the universe of MATLAB users:
\n https:\/\/twitter.com\/BikeMath\/status\/738818666448314369<\/p>\n
I sampled his… read more >><\/a><\/p>\n","protected":false},"author":69,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/blogs.mathworks.com\/community\/wp-json\/wp\/v2\/posts\/3758"}],"collection":[{"href":"https:\/\/blogs.mathworks.com\/community\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.mathworks.com\/community\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.mathworks.com\/community\/wp-json\/wp\/v2\/users\/69"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.mathworks.com\/community\/wp-json\/wp\/v2\/comments?post=3758"}],"version-history":[{"count":6,"href":"https:\/\/blogs.mathworks.com\/community\/wp-json\/wp\/v2\/posts\/3758\/revisions"}],"predecessor-version":[{"id":3767,"href":"https:\/\/blogs.mathworks.com\/community\/wp-json\/wp\/v2\/posts\/3758\/revisions\/3767"}],"wp:attachment":[{"href":"https:\/\/blogs.mathworks.com\/community\/wp-json\/wp\/v2\/media?parent=3758"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.mathworks.com\/community\/wp-json\/wp\/v2\/categories?post=3758"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.mathworks.com\/community\/wp-json\/wp\/v2\/tags?post=3758"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}