如何在matlab中计算平均值，最小值和最大值答案

【问题标题】：How to calculate the mean, min and max in matlab如何在matlab中计算平均值，最小值和最大值
【发布时间】：2016-09-15 03:14:04
【问题描述】：

所以我有一个脚本可以根据加速器数据计算平均值：

clear all
close all
clc

load 'results.txt'
Fq=51.2;
N=length(results);

t= [1:N]/Fq;

plot (t,results);

role=results;
lowrow=role(1:9244,:);
fly=role(9245:18700,:);
pull=role(18802:28171,:);

subplot(3,1,1)
plot(lowrow)
xlabel('Samples'); ylabel('Acceleration'); title('High to Low Rows')
subplot(3,1,2)
plot(fly)
xlabel('Samples'); ylabel('Acceleration'); title('Reverse Fly')
subplot(3,1,3)
plot(pull)
xlabel('Samples'); ylabel('Acceleration'); title('Lawn Mower Pull')

windowLength = 5; %Length for each window in seconds
startPos = 1; %Starting Position for 1st win
endPos = startPos + (windowLength * floor(Fq)); %End Position for 1st win
totalWindows = floor(length(lowrow)/Fq/windowLength);

stats = zeros(windowLength,9);

for i = 1:totalWindows
epMean = mean(lowrow(startPos:endPos,:)); %calculate window mean

%X, Y & Z axis values for each stat
lowrowfeatures(i,1:3) = epMean; 

%Next window position
startPos = endPos+1;
endPos = startPos + (windowLength * floor(Fq));
end
windowLength = 5; %Length for each window in seconds
startPos = 1; %Starting Position for 1st win
endPos = startPos + (windowLength * floor(Fq)); %End Position for 1st win
totalWindows = floor(length(fly)/Fq/windowLength);

stats = zeros(windowLength,9);

for i = 1:totalWindows
epMean = mean(fly(startPos:endPos,:)); %calculate window mean

%X, Y & Z axis values for each stat
flyfeatures(i,1:3) = epMean; 

%Next window position
startPos = endPos+1;
endPos = startPos + (windowLength * floor(Fq));
end
windowLength = 5; %Length for each window in seconds
startPos = 1; %Starting Position for 1st win
endPos = startPos + (windowLength * floor(Fq)); %End Position for 1st win
totalWindows = floor(length(pull)/Fq/windowLength);

stats = zeros(windowLength,9);

for i = 1:totalWindows
epMean = mean(pull(startPos:endPos,:)); %calculate window mean

%X, Y & Z axis values for each stat
pullfeatures(i,1:3) = epMean; 

%Next window position
startPos = endPos+1;
endPos = startPos + (windowLength * floor(Fq));
end


save('wekafile.txt','lowrowfeatures','flyfeatures','pullfeatures','-ascii')

我知道平均值、最小值和最大值都应该在一个脚本上，我只是不确定如何执行此操作。然后我会将它作为 arff 文件放入 weka 中以查看 j48 树。

亲切的问候:)

【问题讨论】：

你不能只是转储一堆代码（甚至没有缩进！）然后询问如何执行完全微不足道的任务，甚至不提及代码中的位置以及要执行这些计算的变量. mean、min 和 max 都是 MATLAB 内置函数，那么您到底遇到了什么问题？
丹，谢谢您的回复。我遇到的问题是我的问题:)
如果是这样，那么它被深深地埋在了无格式和不相关的代码中，没有人会找到它。阅读How to Ask 以及如何创建MCVE。在您的情况下，您需要专注于 M（为了最小化，删除所有不相关的代码）。

标签： matlab max weka min mean

【解决方案1】：

我不确定我是否理解这个问题，但 MATLAB 有一个用于计算 min 和 max 的内置函数，就像平均值一样。使用;

minimum = min(variable);
maximum = max(variable);

【讨论】：