matlab画频率分布直方图

Generate 10,000 random numbers and create a histogram. The histogramfunction automatically chooses 
an appropriate number of bins to cover the range of values in x and show the shape of the 
underlying distribution.

x = randn(10000,1);
h = histogram(x)

randn(100001)产生10 000个均值0，标准差1的正态分布随机数。

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另一个例子：

clc
clear
close all

imgColor = imread('one_section_bianjihou.jpg');
imgGray = rgb2gray(imgColor);

%% imhist
figure('name', 'imhist'),
imhist(imgGray);

%% histogram
figure('name', 'histogram auto'),
% histogram函数自动计算NumBins值
hist2 = histogram(imgGray);
% Find the bin counts
binCounts = hist2.Values;
% Get bin number
binNum = hist2.NumBins;

%% histogram 指定NumBins值
% Specify number of histogram bins
figure('name', 'histogram256'),
hist256 = histogram(imgGray, 256); % 等同于 imhist(imgGray)

 

 

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https://www.cnblogs.com/gxcdream/p/7710729.html