how to subtract and insert a data into a matrix

Question

Abebe kebede 2015-4-28

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/214000-how-to-subtract-and-insert-a-data-into-a-matrix

编辑： the cyclist 2015-4-28

I have 600 by 3 matrix which looks like the following:

     23.456        10.598       1.890
     21.116        11.222      -5.369
     41.963       -10.256      11.235
     54.256        14.589      15.888 
     18.953        20.359      14.523 
     50.142         6.256       9.124
       .             .           .
       .             .           .
       .             .           .
first i want to change the values of each even rows (2,4,6,8...598,600)by the difference between the the values of odd and even rows,i.e row1 - row 2,row3 -row4.......row599-row600. And finally i want to put additional row vector [10.000  10.000  10.000] between each odd and even rows,i.e row1&row2,row3&row4.....row599 & row 600. so finaly i will have 900 by 3 matrix.

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

the cyclist 2015-4-28

在 MATLAB Online 中打开

Just to check exactly what you mean, what should the final values of Row 2 be?

2.3400 -0.6240 7.2590

?

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

the cyclist 2015-4-28

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/214000-how-to-subtract-and-insert-a-data-into-a-matrix#answer_177004

编辑：the cyclist 2015-4-28

在 MATLAB Online 中打开

See my comment above. If that assumption is correct, then here is one way to get what you want:

A = [23.456        10.598       1.890
     21.116        11.222      -5.369
     41.963       -10.256      11.235
     54.256        14.589      15.888 
     18.953        20.359      14.523 
     50.142         6.256       9.124];
B = 10*ones(3*size(A,1)/2,size(A,2)); 
B(1:3:end,:) = A(1:2:end,:);
B(2:3:end,:) = A(1:2:end,:) - A(2:2:end,:)

This is generalizable to any size for A, as long as it has an even number of rows.

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。

Answer 2

Jason 2015-4-28

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/214000-how-to-subtract-and-insert-a-data-into-a-matrix#answer_177006

编辑：Jason 2015-4-28

在 MATLAB Online 中打开

Perhaps something like the following?

% Subtracting and replacing even rows
Data = *original data*;
UpdatedData = zeros(size(Data*1.5,3);
UpdatedData(1:3:end,:) = Data(1:2:end,:);
UpdatedData(3:3:end,:) = Data(1:2:end,:) - Data(2:2:end,:);
% Inserting Rows
UpdatedData(2:3:end,:) = repmat([10 10 10], [size(UpdatedData,1)/3,1]);