Creating and Calling functions

1 次查看（过去 30 天）

Macarena Santillan 2021-5-26

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/840780-creating-and-calling-functions

评论： Macarena Santillan 2021-6-7

Hello,

I want to create a function that will take a data set, extract desired columns/rows , take their average and compute the difference.

I am new to this and I am not sure why I am getting errors, this is what I have so far. Does anyone know where I went wrong? I thought the function maybe should be the last line of my code, but that did not work either.

Also, as I have 20+ data sets I want to do this analysis on, can I do it on the same script or do I need a new different file?

Thank you!

%Create a functions that computes the averages of plateaus and difference between them.
function
  data=readmatrix(x);
 %extract desired rows and columns
 x1=data(13911:111401,1);
y1=data(13911:111401,2);
x2=data(216399:1000015,1);
y2=data(216399:1000015,2);
Mx1= mean(x1,'all');
My1 = mean(y1,'all');
Mx2= mean(x2,'all');
My2 = mean(y2,'all');
 mvd= (My2- My1);
end

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

Walter Roberson 2021-5-26

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/840780-creating-and-calling-functions#answer_709965

在 MATLAB Online 中打开

function
  data=readmatrix(x);

That needs to be on a single line.

Mx1= mean(x1,'all');

Using 'all' is not wrong, but it is unnecessary, as you are working with vectors.

Note that you compute the x means but you do not do anything with them.

Note that you do not return mvd, only data.

17 个评论
显示 15更早的评论隐藏 15更早的评论

Walter Roberson 2021-6-7

在 MATLAB Online 中打开

dinfo = dir('tek*.csv');
filenames = {dinfo.name};
num_files = length(filenames);
results = zeros(num_files,5);
for K = 1 : length(filenames)
    results(K,:) = computingmvdifference(filenames{K});
end
%Create a functions that computes the averages of plateaus and difference between them.
function results = computingmvdifference(x)
    data = readmatrix(x);
    
     %extract desired rows and columns
    x1=data(13911:111401,1);
    y1=data(13911:111401,2);
    
    x2=data(216399:1000015,1);
    y2=data(216399:1000015,2);
    
    Mx1 = mean(x1,'all');
    My1 = mean(y1,'all');
    
    Mx2= mean(x2,'all');
    My2 = mean(y2,'all');
    
    mvd = (My2- My1);
    
    results = [mvd, Mx1, My1, Mx2, My2];
end

After the code finishes, then

results(:,1)  -- will be all of the mvd values
results(:,2)  -- will be all of the Mx1 values
results(:,3)  -- will be all of the My1 values
results(:,4)  -- will be all of the Mx2 values
results(:,5)  -- will be all of the My2 values