# densityPlot2D

**Repository Path**: iDMatlab/density-plot2-d

## Basic Information

- **Project Name**: densityPlot2D
- **Description**: 散点图怎么改成热力图
- **Primary Language**: Unknown
- **License**: Not specified
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2023-02-25
- **Last Updated**: 2023-02-25

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# densityPlot2D


```
clc;clear;close all;
%      @author:猪猪侠
%      @Email：2377389590@qq.com
%      @WeChart:iDmatlab
%      @公众号：好玩的Matlab
%% ================生成数据=======================================
z = [repmat([2 4],1000,1) + randn(1000,2)*[1 .5; 0 1.32];...
     repmat([9 1],1000,1) + randn(1000,2)*[1.4 .2; 0 0.98];...
     repmat([4 8],1000,1) + randn(1000,2)*[1 .7; 0  0.71];];

%% ================原始数据绘图====================================
figure
plot(z(:,1),z(:,2),'k.','MarkerSize',10);
title('原始数据图');
axis square
ax=gca;
grid on;
ax.LineWidth=1;
ax.XMinorTick='on';
ax.YMinorTick='on';
ax.GridLineStyle=':';
ax.FontSize=14;
ax.XLabel.String='x';
ax.YLabel.String='y';
ax.FontName='Times New Roman';
%% ========密度热力图=============
figure
densityPlot2D(z(:,1),z(:,2),50);
box on
axis square
colormap("jet");
colorbar;
ax=gca;
ax.LineWidth=1;
ax.XMinorTick='on';
ax.YMinorTick='on';
ax.TickDir='out';
ax.GridLineStyle=':';
ax.FontSize=14;
ax.FontName='Times New Roman';
ax.Title.String='密度热力图';
ax.XLabel.String='x';
ax.YLabel.String='y';

figure
densityPlot2D(z(:,1),z(:,2),50);

% cMap=makeColorMap([1,1,1;0,0,1;0,1,0;1,0,0],50);
% cMap=makeColorMap([0,0,0;0,0,1;0,1,0;1,0,0],50);
cMap=makeColorMap;
box on
axis square
colormap(cMap);
% colormap('jet');
colorbar;
ax=gca;
ax.LineWidth=1;
ax.XMinorTick='on';
ax.YMinorTick='on';
ax.TickDir='out';
ax.GridLineStyle=':';
ax.FontSize=14;
ax.FontName='Times New Roman';
ax.Title.String='密度热力图';
ax.XLabel.String='x';
ax.YLabel.String='y';

img=imread('pic4.jpg');
[ind,map] = rgb2ind(img,30);
% 颜色排序  https://stackoverflow.com/questions/2245842/sorting-colors-in-matlab/2246189#2246189
map = rgb2hsv(map);
map = sortrows(map, [-1 -3 2],'ascend');  %# sort first by Hue, then by value
map = hsv2rgb(map);
cMap=makeColorMap(map,30);

figure
densityPlot2D(z(:,1),z(:,2),50);
box on
axis square
colormap(cMap);
% colormap('jet');
colorbar;
ax=gca;
ax.LineWidth=1;
ax.XMinorTick='on';
ax.YMinorTick='on';
ax.TickDir='out';
ax.GridLineStyle=':';
ax.FontSize=14;
ax.FontName='Times New Roman';
ax.Title.String='密度热力图';
ax.XLabel.String='x';
ax.YLabel.String='y';
```
![输入图片说明](1.png)
![输入图片说明](2.png)
![输入图片说明](3.png)
![输入图片说明](4.png)