{"id":102,"date":"2008-12-27T23:02:46","date_gmt":"2008-12-27T22:02:46","guid":{"rendered":"http:\/\/www.walkingrandomly.com\/?p=102"},"modified":"2008-12-27T23:03:18","modified_gmt":"2008-12-27T22:03:18","slug":"a-matlab-christmas-card","status":"publish","type":"post","link":"https:\/\/walkingrandomly.com\/?p=102","title":{"rendered":"A MATLAB Christmas card"},"content":{"rendered":"

The guys at Blinkdagger<\/a> put together a great MATLAB Christmas card for you all and sent it in to me as part of the Walking Randomly Christmas challenge<\/a>.\u00a0 I would have posted it earlier but I have been away from the Internet over Christmas (sorry Rob). Thanks guys!<\/p>\n

\"MATLAB<\/p>\n

A brief explanation of the maths involved (from Rob of Blinkdagger)
\n– the snowdrifts are sine waves of different amplitudes and offsets
\n– the tree is a 3D spiral of green asterisks
\n– the ornaments are a random selection of the same points as the tree,
\nwith different colors and marker types
\n– the presents under the tree are the trademark “membrane” surface that is the MATLAB logo.
\n– the star atop the tree, as well as the star in the sky are just single points graphed, but using the default marker types creatively
\n– the text is, well it’s just text<\/p>\n


\n% Xmas card from blinkdagger.com for the challenge<\/code><\/p>\n

%% setup the fig
\nh1 = figure(‘Position’,[50 50 800 600],’Color’,’w’);<\/p>\n

%% Put background snowdrifts and star
\naxes(‘Position’,[0 0.5 1 .05]);
\nezplot(‘sin(.1*x+1.8)’); axis off; title(”);<\/p>\n

axes(‘Position’,[0 0.4 1 .1]);
\nezplot(‘sin(.3*x)’); axis off; title(”);<\/p>\n

axes(‘Position’,[0 0.25 1 .1]);
\nezplot(‘sin(.4*x-1.5)’); axis off; title(”);<\/p>\n

axes(‘Position’,[0 0.1 1 .15]);
\nezplot(‘cos(.4*x-2)’); axis off; title(”);<\/p>\n

axes(‘Position’,[0.75 0.75 0.2 0.2]);
\nplot(1,1,’x’,’markersize’,48,’markeredgecolor’,[.5 .5 .5]);
\naxis off; title(”); hold on;
\nplot(1,1,’h’,’markersize’,36,’markeredgecolor’,[.5 .5 .5]);
\nplot(1,1,’+’,’markersize’,80,’markeredgecolor’,[.5 .5 .5]);
\nhold off;<\/p>\n

%% Put tree on and decorate it<\/p>\n

axes(‘Position’,[0.55 0.2 0.4 0.6]);
\nz = 0:.05:100;
\nx = cos(z); x = (101-z).*x;
\ny = sin(z); y = (101-z).*y;
\nplot3(x,y,z,’g*’,’markersize’,18); axis off; view(0,10);
\nhold all;
\n% star on top
\nplot3(0,0,107,’p’,’markersize’,24,’markerfacecolor’,[1 .8431 0],…
\n‘markeredgecolor’,’r’);
\n% plot ornaments
\nk = rand(size(x));
\nk1 = k>.97;
\nk2 = k>.94 & k<.97;
\nk3 = k>.91 & k<.94;
\nk4 = k>.88 & k<.91;
\nk5 = k>.85 & k<.88;
\nk6 = k>.82 & k<.85;
\nplot3(x(k1),y(k1),z(k1),’ro’,’markersize’,8,’linewidth’,2); axis off; view(0,10);
\nplot3(x(k2),y(k2),z(k2),’ys’,’markersize’,8,’linewidth’,2); axis off; view(0,10);
\nplot3(x(k3),y(k3),z(k3),’md’,’markersize’,8,’linewidth’,2); axis off; view(0,10);
\nplot3(x(k4),y(k4),z(k4),’b^’,’markersize’,8,’linewidth’,2); axis off; view(0,10);
\nplot3(x(k5),y(k5),z(k5),’kh’,’markersize’,8,’linewidth’,2); axis off; view(0,10);
\nplot3(x(k6),y(k6),z(k6),’c*’,’markersize’,8,’linewidth’,2); axis off; view(0,10);<\/p>\n

hold off;<\/p>\n

%% Put presents under the tree
\naxes(‘Position’,[0.5 0.12 0.1 0.15]);
\ncolormap(hot*.7); surf(membrane,membrane); shading flat; axis off; view(300,20);
\naxes(‘Position’,[0.57 0.1 0.1 0.15]);
\nsurf(membrane); shading flat; axis off; view(300,20);
\naxes(‘Position’,[0.63 0.08 0.1 0.15]);
\nsurf(membrane); shading flat; axis off; view(300,20);
\naxes(‘Position’,[0.7 0.08 0.1 0.15]);
\nsurf(membrane); shading flat; axis off; view(300,20);
\naxes(‘Position’,[0.77 0.1 0.1 0.15]);
\nsurf(membrane); shading flat; axis off; view(300,20);
\naxes(‘Position’,[0.83 0.13 0.1 0.15]);
\nsurf(membrane); shading flat; axis off; view(300,20);<\/p>\n

%% Overlay snowflakes<\/p>\n

%% Text greeting<\/p>\n

axes(‘Position’,[.05 .6 .5 .5]); axis off;
\ntext(.08,.55,’Seasons Greetings!’,’fontsize’,30,’color’,’r’,…
\n‘fontname’,’Garamond’,’fontweight’,’bold’);
\ntext(.07,.31,’Best wishes and have a great 2009′,’fontsize’,20,…
\n‘color’,[0 .4 0],’fontname’,’Garamond’);
\ntext(.07,.18,’solving problems with MATLAB!’,’fontsize’,20,…
\n‘color’,[0 .4 0],’fontname’,’Garamond’);
\ntext(.07,.05,’From everyone at blinkdagger.com!’,’fontsize’,20,…
\n‘color’,[0 .4 0],’fontname’,’Garamond’);<\/p>\n","protected":false},"excerpt":{"rendered":"

The guys at Blinkdagger put together a great MATLAB Christmas card for you all and sent it in to me as part of the Walking Randomly Christmas challenge.\u00a0 I would have posted it earlier but I have been away from the Internet over Christmas (sorry Rob). Thanks guys! A brief explanation of the maths involved […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[11],"tags":[],"class_list":["post-102","post","type-post","status-publish","format-standard","hentry","category-matlab"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p3swhs-1E","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/walkingrandomly.com\/index.php?rest_route=\/wp\/v2\/posts\/102","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/walkingrandomly.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/walkingrandomly.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/walkingrandomly.com\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/walkingrandomly.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=102"}],"version-history":[{"count":5,"href":"https:\/\/walkingrandomly.com\/index.php?rest_route=\/wp\/v2\/posts\/102\/revisions"}],"predecessor-version":[{"id":481,"href":"https:\/\/walkingrandomly.com\/index.php?rest_route=\/wp\/v2\/posts\/102\/revisions\/481"}],"wp:attachment":[{"href":"https:\/\/walkingrandomly.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=102"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/walkingrandomly.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=102"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/walkingrandomly.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=102"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}