Dividing an entire row by every element of a column

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Nany 2022-4-5

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评论： Voss 2022-4-6

采纳的回答： Voss

Hi,

I have a 20x 60 matrix. I am trying to divide an entire row (3rd) by every element of the first column.

I know it should be solved using for loop but I am still fairly new to MATLAB, so I don't know the syntax of For Loop. Would appreciate any help.

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Nany 2022-4-6

编辑：Nany 2022-4-6

在 MATLAB Online 中打开

my_matrix= [ 2 4 8 10 10 8; 6 16 16 20 18 30]
second_row= my_matrix(2, :)
first_column= my_matrix (:,1)

I want to divide every element in the second row by every element in the first colmun (2 and 6 in this case)

Is it possible in matlab?

Torsten 2022-4-6

What we'd like to know is: what would be the result for your test matrix from above ?

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Voss 2022-4-5

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在 MATLAB Online 中打开

Like this? (Using a 5x3 matrix as an example.)

A = (1:5).'+3*(0:2)
A = 5×3
     1     4     7
     2     5     8
     3     6     9
     4     7    10
     5     8    11
A(3,:)./A(:,1) % 3rd row divided by first column
ans = 5×3
    3.0000    6.0000    9.0000
    1.5000    3.0000    4.5000
    1.0000    2.0000    3.0000
    0.7500    1.5000    2.2500
    0.6000    1.2000    1.8000
%   3/1     6/1     9/1
%   3/2     6/2     9/2
%   3/3     6/3     9/3
%   3/4     6/4     9/4
%   3/5     6/5     9/5