{"id":1964,"date":"2021-07-15T18:47:03","date_gmt":"2021-07-15T10:47:03","guid":{"rendered":"https:\/\/nullthought.net\/?p=1964"},"modified":"2024-08-08T14:53:07","modified_gmt":"2024-08-08T06:53:07","slug":"%e7%94%a8matlab%e7%94%bb%e4%b8%80%e6%9c%b5%e6%bc%82%e4%ba%ae%e7%8e%ab%e7%91%b0%f0%9f%8c%b9","status":"publish","type":"post","link":"https:\/\/nullthought.net\/?p=1964","title":{"rendered":"\u7528Matlab\u753b\u4e00\u6735\u6f02\u4eae\u73ab\u7470🌹"},"content":{"rendered":"\n

Matlab\u7684facebook\u5b98\u65b9\u8d26\u53f7\u7ed9\u51fa\u4e86\u4e00\u6bb5\u4ee3\u7801\uff0c\u8fd0\u884c\u4ee3\u7801\u53ef\u4ee5\u753b\u51fa\u4e00\u6735\u6f02\u4eae\u7684\u7ea2\u73ab\u7470\u3002<\/p>\n\n\n\n

\"\"
Credit: Matlab<\/a><\/figcaption><\/figure>\n\n\n\n
\n

n = 800;
A = 1.995653;
B = 1.27689;
C = 8;
r=linspace(0,1,n);
theta=linspace(-2,20pi,n);<\/em>
[R,THETA]=ndgrid(r,theta); <\/em>
% define the number of petals we want per cycle. Roses have 3 and a bit. <\/em>
petalNum=3.6; <\/em>
x = 1 – (1\/2)<\/em>((5\/4)(1 – mod(petalNum<\/em>THETA, 2pi)\/pi).^2 – 1\/4).^2; <\/em>
phi = (pi\/2)<\/em>exp(-THETA\/(Cpi));<\/em>
y = A<\/em>(R.^2).(B<\/em>R – 1).^2.sin(phi);<\/em>
R2 = x.<\/em>(R.sin(phi) + y.<\/em>cos(phi));
X=R2.sin(THETA);<\/em>
Y=R2.<\/em>cos(THETA);
Z=x.(R.<\/em>cos(phi)-y.*sin(phi));
% % define a red map for our rose colouring
red_map=linspace(1,0.25,10)’;
red_map(:,2)=0;
red_map(:,3)=0;
clf
surf(X,Y,Z,’LineStyle’,’none’)
view([-40.50 42.00])
colormap(red_map)<\/p>\n—Matlab codes to plot a beautiful red rose. Credit: Matlab<\/a><\/cite><\/blockquote>\n\n\n\n

\u4eb2\u6d4b\u6709\u6548~<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

\u6539\u4e86\u51e0\u884c\u4ee3\u7801\uff0c\u6362\u4e86\u4e2a\u989c\u8272\uff0c\u6362\u6210\u4e86\u4e00\u6735\u84dd\u73ab\u7470\u3002<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n
\n\n\n\n

P.S., \u7528Matlab\u753b\u4e00\u652f\u90c1\u91d1\u9999\uff1a<\/p>\n\n\n\n

%% MATLAB Tulip\nnp = 3; % number of petals\nn=np*20+1; % Theta resolution\ntheta=linspace(0, np*(1\/np)*2,n);\nr=linspace(0,1,80)';\nnewplot\nfor k=[0 1\/np] % 2 layers of petals\n    x=1-(.8*(1-mod(np*(theta+k),2)).^3-.05).^2\/2;\n    Z1=((x.*r).^6);\n    R2=x.*r*(1-k*.38);\n    R3=x.*(r.^8)*.4.*Z1;\n    X=R2.*cospi(theta)-R3.*cospi(theta);\n    Y=R2.*sinpi(theta)-R3.*sinpi(theta);\n    C=repmat(r,1,n).^25;\n    %% Petals\n    surface(X,Y,Z1*2,C,FaceColor=\"interp\",EdgeColor=\"none\",FaceLighting=\"gouraud\");\n    line(X(end,:),Y(end,:),Z1(end,:)*2,Color=\"#cc0\",LineWidth=1);\nend\n%% Stem\n[CX,CY,CZ]=cylinder;\nsurface(CX*.1,CY*.1,(CZ-1)*2,[],FaceColor=\"#9b8\",EdgeColor=\"none\");\n%% Decorate!\ncmap=hot(200); % Colors of tulip\ncolormap(cmap(80:150,:)) % Extract subset of hot colormap.\naxis off equal\nview([0,10]);\nmaterial([.6 .9 .3 2 .5])\ncamlight(40,40)\n<\/code><\/pre>\n\n\n\n
\"\"
Draw a Tullip Using Matlab Code, Source: MATLAB<\/a><\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"
Matlab\u7684facebook\u5b98\u65b9\u8d26\u53f7\u7ed9\u51fa\u4e86\u4e00\u6bb5\u4ee3\u7801\uff0c\u8fd0\u884c\u4ee3\u7801\u53ef\u4ee5\u753b\u51fa\u4e00\u6735\u6f02\u4eae\u7684\u7ea2\u73ab\u7470\u3002 n = 800;A  […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[3,8],"tags":[48],"class_list":["post-1964","post","type-post","status-publish","format-standard","hentry","category-it","category-tech","tag-48"],"rttpg_featured_image_url":null,"rttpg_author":{"display_name":"NullThought","author_link":"https:\/\/nullthought.net\/?author=1"},"rttpg_comment":0,"rttpg_category":"IT<\/a> Tech<\/a>","rttpg_excerpt":"Matlab\u7684facebook\u5b98\u65b9\u8d26\u53f7\u7ed9\u51fa\u4e86\u4e00\u6bb5\u4ee3\u7801\uff0c\u8fd0\u884c\u4ee3\u7801\u53ef\u4ee5\u753b\u51fa\u4e00\u6735\u6f02\u4eae\u7684\u7ea2\u73ab\u7470\u3002 n = 800;A …","_links":{"self":[{"href":"https:\/\/nullthought.net\/index.php?rest_route=\/wp\/v2\/posts\/1964","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nullthought.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nullthought.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nullthought.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nullthought.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1964"}],"version-history":[{"count":3,"href":"https:\/\/nullthought.net\/index.php?rest_route=\/wp\/v2\/posts\/1964\/revisions"}],"predecessor-version":[{"id":3827,"href":"https:\/\/nullthought.net\/index.php?rest_route=\/wp\/v2\/posts\/1964\/revisions\/3827"}],"wp:attachment":[{"href":"https:\/\/nullthought.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1964"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nullthought.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1964"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nullthought.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1964"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}