Code for a function for matrixes?

1 次查看（过去 30 天）

显示更早的评论

John Jamison 2017-3-5

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/328230-code-for-a-function-for-matrixes

关闭： MATLAB Answer Bot 2021-8-20

在 MATLAB Online 中打开

Hi,

Can I have some help for this code for the manual entering of a max function?

I was thinking of doing a if statement to keep tracking each number, but I am stuck. I currently have:

function [a b] = myMax(v) 
maxHigh = 0;
currHigh = 1;
for i = 1:length(v)
    if maxHigh > currHigh
       currHigh = maxHigh
    end
end

Thank you

3 个评论
显示 1更早的评论隐藏 1更早的评论

John Jamison 2017-3-5

编辑：Image Analyst 2017-3-6

在 MATLAB Online 中打开

function [a b] = myMax(v) 
maxHigh = 0;
currHigh = 1;
for i = 1:length(v)
    if maxHigh > currHigh
       currHigh = maxHigh
    end
end

Rena Berman 2017-3-7

(Answers Dev) Restored edit

此问题已关闭。

回答（1 个）

Image Analyst 2017-3-6

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/328230-code-for-a-function-for-matrixes#answer_257410

在 MATLAB Online 中打开

John, your code is very close but you need to initialize the variables and store the row the max shows up in. I renamed some variables and saved the row. Here's a little more to get you going:

function [columnMaxes, rowsOfMax] = myMax(v)
[rows, columns] = size(v);
columnMaxes = -inf * ones(1, columns);
rowsOfMax = zeros(1, columns);
for col = 1 : columns
  for row = 1 : rows
    thisValue = v(row, col);
    if thisValue > columnMaxes(col)
      columnMaxes(col) = thisValue;
      rowsOfMax(col) = row;
    end
  end
end
end

See that it works for both 1-D arrays (both column vectors and row vectors), and 2-D arrays. You might put in a check to see if it's a 3-D array and popup an error message with sprintf(), uiwait(), and errordlg().