如何更改直方图中特定仓的颜色？

Question

我在MATLAB中编写了一个绘制直方图的代码。我需要用不同颜色的箱子给其中一个箱子着色（比方说红色）。有人知道该怎么做吗？例如，给定：

A = randn(1,100); 
hist(A); 

我该如何制作0.7属于红色的bin？

Answer 1

我想最简单的方法是首先绘制直方图，然后在其上绘制红色框。

A = randn(1,100); 
[n,xout] = hist(A); %# create location, height of bars 
figure,bar(xout,n,1); %# draw histogram 

dx = xout(2)-xout(1); %# find bin width 
idx = abs(xout-0.7) < dx/2; %# find the bin containing 0.7 
hold on;bar([xout(idx)-dx,xout(idx),xout(idx)+dx],[0,n(idx),0],1,'r'); %# plot red bar 

Answer 2

到使两个重叠条曲线等Jonas suggests另一种方法是使一个呼叫到bar绘制箱为一组patch objects，然后修改重新着色补丁面孔：

A = randn(1,100);     %# The sample data 
[N,binCenters] = hist(A);   %# Bin the data 
hBar = bar(binCenters,N,'hist'); %# Plot the histogram 
index = abs(binCenters-0.7) < diff(binCenters(1:2))/2; %# Find the index of the 
                 %# bin containing 0.7 
colors = [index(:) ...    %# Create a matrix of RGB colors to make 
      zeros(numel(index),1) ... %# the indexed bin red and the other bins 
      0.5.*(~index(:))];   %# dark blue 
set(hBar,'FaceVertexCData',colors); %# Re-color the bins 

而这里的输出：