Find max value in each column of a 6x5 matrix without using built in matlab functions.

Question

Josh Rudbart 2019-4-17

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/457007-find-max-value-in-each-column-of-a-6x5-matrix-without-using-built-in-matlab-functions

评论： Josh Rudbart 2019-4-17

My command window for one of the columns is underneath code and i just cannot figure out how to get the max value in each column. i have gotten down to having columnval= each number in each column but when cant figure out how to go about getting the max because what ive tried ends up giving me same maxval for every columnval.

A=randi(100,6,5) 
for columns=1:5
    column=A(:,columns)
    maxvalue=0;
    for columndown=1:6
          columnval=column(columndown,:)
        if columnval>maxvalue
            maxvalue=columnval;     
        end
    end
end

column =

6

18

67

34

90

12

columnval =

6

columnval =

18

columnval =

67

columnval =

34

columnval =

90

columnval =

12

2 个评论
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Walter Roberson 2019-4-17

https://www.mathworks.com/matlabcentral/answers/38787-what-can-be-programmed-without-any-built-in-functions

Josh Rudbart 2019-4-17

i think professor just specifically wants us not to use max function

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Answer 1

Mauro Fusco 2019-4-17

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/457007-find-max-value-in-each-column-of-a-6x5-matrix-without-using-built-in-matlab-functions#answer_371097

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Hi,

based on your code a few modifications will make it work:

A=randi(100,6,5)
maxvalue = zeros(1,5);
for columns=1:5
    column=A(:,columns);
    
    for columndown=1:6
          columnval=column(columndown);
        if columnval>maxvalue(columns)
            maxvalue(columns)=columnval;     
        end
    end
end
maxvalue %show the row with max value for each column :-)