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点击上方蓝字和“好玩的MATLAB”一起快乐玩耍吧！' d7 C1 ]% l6 n
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好玩的matlab
]0 A- ]6 ?( J带你解锁不一样的matlab新玩法) Q6 b* c) a- I
- @" L& ?( Y. G大家好，我是小猪猪，因为个人问题好久都没有发推文了，在此期间都是另一位小伙伴管理公众号，在此对她的付出进行感谢；今天我给大家介绍怎么利用一张图完成绘图配色问题，喜欢此推文的小伙伴们记得点赞+关注+分享！$ `+ ~% v# C4 J8 W; E7 y9 d; h
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文末有送书活动7 f P5 o8 [9 Y- k/ ^
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小编代言强烈推荐
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% z' A+ S$ O2 U- y' W4 k' k程序分析
+ ]! p/ t$ c$ W( j' `. {- G1、获取配色图片4 D- R: U" b1 }7 A& B& s* T1 G# C. b
RGB 转换为包含3种颜色的索引图像img=imread('./pic/pic5.jpg');[ind,map] = rgb2ind(img,3);image(img)ax=gca;ax.LineWidth=1;ax.XMinorTick='on';ax.YMinorTick='on';ax.GridLineStyle=':';ax.FontSize=14;ax.FontName='Times New Roman';
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2、颜色排序7 {. c1 G1 _: i7 K( Y% x
首先，我们从常规的 Jet 颜色图开始：% 参考原文：https://stackoverflow.com/questions/2245842/sorting-colors-in-matlab/2246189#2246189I = repmat(1:100, 100, 1);C = jet(100);figuresubplot(211), imagesc(I), colormap(C)subplot(212), rgbplot(C)9 U. r( f! T& H$ d
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其次，打乱颜色顺序。然后尝试恢复原始的颜色分组 (通过根据色相和值在HSV颜色空间中进行排序来完成此操作)：6 e* E9 Y) A, X9 [
C = C(randperm(100), :);C = rgb2hsv(C);C = sortrows(C, [-1 -3 2]); C = hsv2rgb(C);figuresubplot(211), imagesc(I), colormap(C)subplot(212), rgbplot(C)- }( D0 ~/ K3 u; q2 ~: S2 J
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. i( f( e/ R0 P+ v8 v9 D8 \) r5 M3 Q3、颜色插值处理; L! Z5 h0 f& r
clc;clear;close all;img=imread('./pic/pic5.jpg');[ind,map] = rgb2ind(img,3);map = rgb2hsv(map);map = sortrows(map, [-1 -3 2],'ascend'); %# sort first by Hue, then by valuemap = hsv2rgb(map);cMap=makeColorMap(map,100);I = repmat(1:3, 3, 1);subplot(2,1,1)imagesc(I), colormap(map)title('图像参考色')ax=gca;grid on;box offax.LineWidth=1;ax.XMinorTick='on';ax.YMinorTick='on';ax.ZMinorTick='on';ax.GridLineStyle=':';ax.FontSize=14;ax.FontName='Times New Roman';+ f* P( V* @6 o) b, F1 D% B
subplot(2,1,2)I = repmat(1:100, 100, 1);imagesc(I), colormap(cMap)title('插值后的渐变色')ax=gca;grid on;box offax.LineWidth=1;ax.XMinorTick='on';ax.YMinorTick='on';ax.ZMinorTick='on';ax.GridLineStyle=':';ax.FontSize=14;ax.FontName='Times New Roman';2 f: f9 |; s6 Q4 C$ Z8 |2 h
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makeColorMap插值函数/ D; l! o2 [: n( u4 m
function cMap=makeColorMap(varargin)%++++++++++++++++++++++++++++++++++++++++++++% @Author: 2377389590@qq.com% -------------------------------------------% 举例子：% peaks;% a = makeColorMap;% colormap(a)% colorbar%% a = makeColorMap([1,0,0;0,1,0;0,0,1]);% colormap(a)% colorbar%% a = makeColorMap([1,0,0;0,1,0;0,0,1],50);% colormap(a)% colorbar%+++++++++++++++++++++++++++++++++++++++++++++% 默认参数defaultNum = 10;defaultColorList=[0,0,0;1,1,1];
# V. s; z. x# R1 L0 fif nargin color.list=defaultColorList; color.Num=defaultNum;elseif nargin==1 if mod(numel(varargin{1}),3)==0 color.list=varargin{1}; color.Num=defaultNum; else disp('参数输入错误,现在产生的是默认参数') color.list=defaultColorList; color.Num=defaultNum; endelseif nargin==2 color.list=varargin{1}; color.Num=varargin{2};elseif nargin>2 disp('参数输入错误,现在产生的是默认参数') color.list=defaultColorList; color.Num=defaultNum;end% ------------------插值操作------------------------for col=1:size(color.list,2) x=1:size(color.list,1); xi=linspace(1,size(color.list,1),color.Num); color.map(:,col)=interp1(x,color.list(:,col),xi);endcMap=color.map;end& }; y* j2 p$ _+ z
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全部代码# Z0 E3 d5 j7 {# @1 s! Z6 D
clc;clear;close all;img=imread('./pic/pic7.jpg');[ind,map] = rgb2ind(img,3);% 颜色排序 https://stackoverflow.com/questions/2245842/sorting-colors-in-matlab/2246189#2246189map = rgb2hsv(map);map = sortrows(map, [-1 -3 2],'ascend'); %# sort first by Hue, then by valuemap = hsv2rgb(map);cMap=makeColorMap(map,19);% ---------------------------------------subplot(4,4,1)image(img)ax=gca;grid on;box offax.LineWidth=1;ax.XMinorTick='on';ax.YMinorTick='on';ax.GridLineStyle=':';ax.FontSize=14;ax.FontName='Times New Roman';
" y$ n6 }4 [/ \% ----------------------------------------subplot(4,4,2)[X,Y,Z] = peaks(100);surfc(X,Y,Z,'EdgeColor','none')colormap(cMap)colorbar;ax=gca;grid on;box offax.LineWidth=1;ax.XMinorTick='on';ax.YMinorTick='on';ax.ZMinorTick='on';ax.GridLineStyle=':';ax.FontSize=14;ax.FontName='Times New Roman';1 S; N5 q C- D: R. P1 ~2 V8 E
% ---------------------------------------------subplot(4,4,3)contourf(peaks,50,'LineStyle','none')colormap(cMap);colorbar;axis equalax=gca;grid on;box offax.LineWidth=1;ax.XMinorTick='on';ax.YMinorTick='on';ax.GridLineStyle=':';ax.FontSize=14;ax.FontName='Times New Roman';4 ?& G# u: S( I f1 [1 k
% -------------------------------------------subplot(4,4,4)x=0:0.1:3*pi;for i=1:size(cMap,1) y=sin(x+i*2.5/size(cMap,1)); hold on plot(x,y,'Color',cMap(i,:),'LineWidth',1)end
7 h* K! `3 d' @% O4 {3 c/ J/ `" Rax=gca;grid on;box offax.LineWidth=1;ax.XMinorTick='on';ax.YMinorTick='on';ax.GridLineStyle=':';ax.FontSize=14;ax.FontName='Times New Roman'; F* L* [/ z4 q D" {; h' X: W( Y
% --------------------------------------------subplot(4,4,5)x1=sort(rand(size(cMap,1),1));b=bar(x1);b.FaceColor = 'flat';for r=1:length(x1) b.CData(r,:) = cMap(r,:);endax=gca;ax.LineWidth=1;ax.XMinorTick='on';ax.YMinorTick='on';ax.GridLineStyle=':';ax.FontSize=14;ax.FontName='Times New Roman';8 E! U; o" y# T' e( [
% ---------------------------------------------subplot(4,4,6)b=bar3(repmat(sin(1:size(cMap,1))*5+10,[10,1]));colormap(cMap);% for k = 1:length(b)% zdata = b(k).ZData; % Use ZData property to create color gradient% b(k).CData = zdata; % Set CData property to Zdata% b(k).FaceColor = "interp"; % Set the FaceColor to 'interp' to enable the gradient% endax=gca;grid on;box offax.LineWidth=1;ax.XMinorTick='on';ax.YMinorTick='on';ax.ZMinorTick='on';ax.GridLineStyle=':';ax.FontSize=14;ax.FontName='Times New Roman';
) Y! w$ s4 `2 ^%--------------subplot(4,4,7)x = (1:1:10);areaData = [x.* rand(1,10) * 5 x.* rand(1,10) * 5 x.* rand(1,10) * 5 x.* rand(1,10) * 5 x.* rand(1,10) * 5 x.* rand(1,10) * 5 x.* rand(1,10) * 5 x.* rand(1,10) * 5 x.* rand(1,10) * 5 x.* rand(1,10) * 5]';points = (1:10);a = area(points, areaData);for i=1:length(a) a(i).FaceColor = cMap(i,:);endax=gca;% grid on;box offax.LineWidth=1;ax.XMinorTick='on';ax.YMinorTick='on';ax.GridLineStyle=':';ax.FontSize=14;ax.FontName='Times New Roman';0 w! W" J: h1 n' Y! p8 @
% ---------------------------subplot(4,4,8)pie(rand(1,size(cMap,1)))ax=gca;ax.FontSize=14;ax.FontName='Times New Roman';, x0 Q5 w% k( r% a
%------------------------------subplot(4,4,9)th = linspace(0,3*pi/2,10);r = linspace(5,20,10);[u,v] = pol2cart(th,r);c = compass(u,v);n = length(c);LineWidth = linspace(1,4,n);for i = 1:n c(i).LineWidth = LineWidth(i); c(i).Color = cMap(i,:);endax=gca;ax.FontSize=14;ax.FontName='Times New Roman';/ N+ ]6 r ]# c ]6 B# l. c# F) l
% ------------------------------subplot(4,4,10)cdata = rand(10,10)*10;h = heatmap(cdata);colormap(cMap)ax=gca;ax.FontSize=14;ax.FontName='Times New Roman';
* `7 X, @* f' f0 T9 L* C% -----------------------------subplot(4,4,11)th = 1:19;r = rand(1,19);sz = rand(1,19)/100;polarbubblechart(th,r,sz,cMap);ax=gca;ax.FontSize=14;ax.FontName='Times New Roman';% -----------------------------subplot(4,4,12)s3 = scatter3(rand(1,19),rand(1,19),rand(1,19),rand(1,19)*1000, cMap,... "filled",... "MarkerEdgeColor",'flat');ax=gca;ax.LineWidth=1;ax.XMinorTick='on';ax.YMinorTick='on';ax.ZMinorTick='on';ax.GridLineStyle=':';ax.FontSize=14;ax.FontName='Times New Roman';% ----------------------------------------subplot(4,4,13)tbl = readtable(fullfile(matlabroot,'examples','matlab','data','BicycleCounts.csv'));daynames = ["Sunday" "Monday" "Tuesday" "Wednesday" "Thursday" "Friday" "Saturday"];x = categorical(tbl.Day,daynames);y = tbl.Total;c = hour(tbl.Timestamp);swarmchart(x,y,20,c,'filled');colormap(cMap)ax=gca;ax.LineWidth=1;ax.XMinorTick='on';ax.YMinorTick='on';ax.GridLineStyle=':';ax.FontSize=14;ax.FontName='Times New Roman';% --------------------------------subplot(4,4,14)x = [zeros(1,500) ones(1,500)];y = randi(2,1,1000);z = randn(1,1000).^2;c = sqrt(z);swarmchart3(x,y,z,50,c,'filled');colormap(cMap)ax=gca;ax.LineWidth=1;ax.XMinorTick='on';ax.YMinorTick='on';ax.ZMinorTick='on';ax.GridLineStyle=':';ax.FontSize=14;ax.FontName='Times New Roman';% -------------------------------subplot(4,4,15)theta = (-90:10:90)*pi/180;r = 2*ones(size(theta));[u,v] = pol2cart(theta,r);f1 = feather(u,v);n = length(f1)-1;LineWidth = linspace(1,2,n);
) _! C8 @# E1 s) `9 F6 L; a6 Q3 ]! Ofor i = 1:n f1(i).LineWidth = LineWidth(i); f1(i).Color = cMap(i,:);end2 C; [/ G; P7 d- X
ax=gca;ax.LineWidth=1;ax.XMinorTick='on';ax.YMinorTick='on';ax.GridLineStyle=':';ax.FontSize=14;ax.FontName='Times New Roman';
$ ^+ |: m4 d# Q0 ~% -------------------------subplot(4,4,16)[X,Y] = meshgrid(-2:0.25:2,-1:0.2:1);Z = X.*exp(-X.^2 - Y.^2);[U,V,W] = surfnorm(X,Y,Z);quiver3(X,Y,Z,U,V,W)hold onsurf(X,Y,Z)axis equalcolormap(cMap)ax=gca;ax.LineWidth=1;ax.XMinorTick='on';ax.YMinorTick='on';ax.ZMinorTick='on';ax.GridLineStyle=':';ax.FontSize=14;ax.FontName='Times New Roman';
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clc;clear;close all;img=imread('./pic/pic7.jpg');[ind,map] = rgb2ind(img,3);% 颜色排序 https://stackoverflow.com/questions/2245842/sorting-colors-in-matlab/2246189#2246189map = rgb2hsv(map);map = sortrows(map, [-1 -3 2],'ascend'); %# sort first by Hue, then by valuemap = hsv2rgb(map);cMap=makeColorMap(map,30);%------------------------------------------------------figuresubplot(2,2,1)load("carsmall.mat")b1 = bubblechart3(MPG,Weight,Displacement,Horsepower,... Model_Year,... "MarkerFaceAlpha",0.8);xlabel("Miles Per Gallon (MPG)");ylabel("Weight")zlabel("Displacement")bubblelegend("Horsepower","Location","eastoutside");colormap(cMap)c = colorbar("Ticks",unique(Model_Year),... "TickLabels",["1970","1976","1982"]);ylabel(c,"Model Year");- Y: H* B8 o+ b7 u, U Z! l6 \
ax=gca;grid on;box offax.LineWidth=1;ax.XMinorTick='on';ax.YMinorTick='on';ax.ZMinorTick='on';ax.GridLineStyle=':';ax.FontSize=14;ax.FontName='Times New Roman';% ------------------------------subplot(2,2,2)b2 = bubblechart(MPG,Weight,Horsepower,... Model_Year,... "MarkerFaceAlpha",0.7);xlabel("Miles Per Gallon (MPG)");ylabel("Weight")bubblelegend("Horsepower","Location","westoutside");colormap(cMap)c = colorbar("Ticks",unique(Model_Year),... "TickLabels",["1970","1976","1982"]);ylabel(c,"Model Year");ax=gca;grid on;box offax.LineWidth=1;ax.XMinorTick='on';ax.YMinorTick='on';ax.ZMinorTick='on';ax.GridLineStyle=':';ax.FontSize=14;ax.FontName='Times New Roman';
/ D; D# ~; o( W8 I5 G, I& C% --------------------------------------------------subplot(2,2,3)tbl = readtable(fullfile(matlabroot,'examples','matlab','data','BicycleCounts.csv'));daynames = ["Sunday" "Monday" "Tuesday" "Wednesday" "Thursday" "Friday" "Saturday"];x = categorical(tbl.Day,daynames);y = tbl.Total;c = hour(tbl.Timestamp);s = swarmchart(x,y,5,c);s.XJitter = 'rand';s.XJitterWidth = 0.5;colormap(cMap)ax=gca;grid on;box offax.LineWidth=1;ax.XMinorTick='on';ax.YMinorTick='on';ax.ZMinorTick='on';ax.GridLineStyle=':';ax.FontSize=14;ax.FontName='Times New Roman';! K" ]" e7 s% v
% -------------------------------------------------subplot(2,2,4)x = linspace(0,10,30);y = x + (rand(size(x)) - 0.5) * 5;
4 m: F; Z/ o% J7 V& H, ?- FdistFromXY = abs(y - x);s = scatter(x,y,90,cMap,... "filled",... 'o',... "AlphaData", (max(distFromXY) - distFromXY),... "MarkerFaceAlpha","flat");
6 s; p6 A& p/ `2 P0 z1 o3 sax=gca;% grid on;% box offax.LineWidth=1;ax.XMinorTick='on';ax.YMinorTick='on';ax.ZMinorTick='on';ax.GridLineStyle=':';ax.FontSize=14;ax.FontName='Times New Roman';
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clc;clear;close all;img=imread('./pic/pic5.jpg');[ind,map] = rgb2ind(img,1000);% 颜色排序 https://stackoverflow.com/questions/2245842/sorting-colors-in-matlab/2246189#2246189map = rgb2hsv(map);map = sortrows(map, [-1 -3 2],'ascend'); %# sort first by Hue, then by valuemap = hsv2rgb(map);cMap=makeColorMap(map,10);% ---------------------------------------figuresubplot(2,3,1)fun1 = @(x,y) sin(x)+sin(y)-(x.^2+y.^2)/20;fs = fsurf(fun1,... "ShowContours","on",... "EdgeColor","none",... "LineWidth",2); D: ^" }7 t8 P2 R: K: ^
ax=gca;colormap(cMap);colorbarlighting gouraud;material shinybox onaxis tightax.LineWidth=1;ax.XMinorTick='on';ax.YMinorTick='on';ax.ZMinorTick='on';ax.GridLineStyle=':';ax.FontSize=14;ax.FontName='Times New Roman'; G- L# k2 U$ d$ @
% -------------------------subplot(2,3,2)[x,y] = peaks(30);z = (x.^2)-(y.^2);width = 2;r = ribbon(y,z,width);ax = gca;colormap(cMap);colorbarax.LineWidth=1;ax.XMinorTick='on';ax.YMinorTick='on';ax.ZMinorTick='on';ax.GridLineStyle=':';ax.FontSize=14;ax.FontName='Times New Roman';# P: M3 B9 _1 B" ]5 t# v- S
% --------------------------------subplot(2,3,3)f = @(x,y,z) x.^2 + y.^2 - z.^2;surfaceTransparency = 0.8;fi = fimplicit3(f,"EdgeColor","none","FaceAlpha",surfaceTransparency);ax = gca;colormap(cMap);colorbarax.LineWidth=1;ax.XMinorTick='on';ax.YMinorTick='on';ax.ZMinorTick='on';ax.GridLineStyle=':';ax.FontSize=14;ax.FontName='Times New Roman';
1 s6 p$ R. G2 a8 f5 r% ]1 x% --------------------------------subplot(2,3,4)[X,Y] = meshgrid(-5:.5:5);Z = Y.*sin(X) - X.*cos(Y);faceColorType = "flat";markerFaceAlpha = 0.3;ms = mesh(X,Y,Z,'FaceAlpha', markerFaceAlpha,"FaceColor", faceColorType);ax = gca;colormap(cMap);colorbarax.LineWidth=1;ax.XMinorTick='on';ax.YMinorTick='on';ax.ZMinorTick='on';ax.GridLineStyle=':';ax.FontSize=14;ax.FontName='Times New Roman';
! z9 A2 A: L+ W" ~% --------------------------------subplot(2,3,5)eigenfunction = 2;L = 100*membrane(eigenfunction,100);p = pcolor(L);p.EdgeColor = "none"; % Remove lines from the plotshading interp % Specify the shading method to useax = gca;colormap(cMap);colorbarax.LineWidth=1;ax.XMinorTick='on';ax.YMinorTick='on';ax.ZMinorTick='on';ax.GridLineStyle=':';ax.FontSize=14;ax.FontName='Times New Roman';% ---------------------------------subplot(2,3,6)[x,y] = meshgrid(-3:.125:3);z = peaks(x,y);w = waterfall(x,y,z);
; f+ x" Q" L k% Q6 ^5 z2 y. ow.LineWidth =1.5;ax = gca;colormap(cMap);colorbarax.LineWidth=1;ax.XMinorTick='on';ax.YMinorTick='on';ax.ZMinorTick='on';ax.GridLineStyle=':';ax.FontSize=14;ax.FontName='Times New Roman';/ n. {4 ~! g3 B9 \$ E
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, x9 x h3 l; W- T( N, O8 Bclc;clear;close all;img=imread('./pic/pic4.jpg');[ind,map] = rgb2ind(img,100);% 颜色排序 https://stackoverflow.com/questions/2245842/sorting-colors-in-matlab/2246189#2246189map = rgb2hsv(map);map = sortrows(map, [-1 -3 2],'ascend'); %# sort first by Hue, then by valuemap = hsv2rgb(map);cMap=makeColorMap(map,30);: [6 F n0 C/ V) T, g$ D2 b
subplot(2,2,1)image(img)ax=gca;ax.LineWidth=1;ax.XMinorTick='on';ax.YMinorTick='on';ax.GridLineStyle=':';ax.FontSize=14;ax.FontName='Times New Roman';( k9 v6 X' s8 D4 \5 |3 m7 g; Z
subplot(2,2,2)[A,R] = readgeoraster('n39_w106_3arc_v2.dt1','OutputType','double');latlim = R.LatitudeLimits;lonlim = R.LongitudeLimits;usamap(latlim,lonlim)geoshow(A,R,'DisplayType','surface')demcmap(A)colormap(cMap)colorbar8 u6 [( I. K" a: \" M% S
subplot(2,2,3)[A,R,cmap] = readgeoraster('oahu_landcover.img');mapshow(A,flipud(cMap),R)colormap(flipud(cMap))colorbar; w% Y. h8 }6 M: N0 r) A5 M
subplot(2,2,4)cMap=makeColorMap(map,3000);load korea5cworldmap(korea5c,korea5cR)geoshow(korea5c,korea5cR,'DisplayType','texturemap')demcmap(korea5c)colormap(flipud(cMap))colorbar, P' l+ }! B8 x3 o: e& h
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此文种对RGB颜色排序的问题，方法还不是很理想，如果有更好的方法请私聊小编！共同探讨一下！4 Q) z: H8 W9 h4 e# t
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参考资料：" R% L$ F+ J1 P8 |* T# K
【1】https://stackoverflow.com/questions/2245842/sorting-colors-in-matlab/2246189#2246189
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' d/ \; u4 Z+ r/ s* K. D包邮赠送人民邮电出版社赞助《MATLAB完全自学教程》共5本，这是今年最受欢迎的MATLAB新书之一，刚刚上架！感兴趣的朋友推荐入手一本。/ P, P8 s9 Z8 B' p5 k; D1 `
% j' G+ Z0 D$ aPart.1、公众号送书活动
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/ T/ w! _2 ?3 e8 q1.关注「好玩的MATLAB 」公众号；' p E8 v" s2 }& J7 {- q$ L' [4 M
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) p; ?" E# a+ u! T, t t8 _6 B【注意】：为了保证公平公正，严禁机器刷票！严禁机器刷票！严禁机器刷票！否则取消获奖资格。两种方式都参与且获奖的小伙伴，只以一次为准，严禁薅羊毛行为，之前本公众号活动有一次获奖的小伙伴，不能再次参加这次活动。最终解释权归小编。
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+ e% \1 `" F1 |【开奖时间】 ：2023年2月20日夜晚8:00 (周一)【领奖方式】：在开奖后，姓名+地址+联系方式发送此活动负责任人 微信：idmatlab，且需要获奖小伙伴转发此推文到自己朋友圈保持三天以上。当然，没有中奖但有需要的小伙伴可以通过下方链接进行购买： |
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