How to delete multiple row and column in matrix A and Delete row and column specified in matrix B?????????????/

Question

VIJAY 2018-8-12

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/414555-how-to-delete-multiple-row-and-column-in-matrix-a-and-delete-row-and-column-specified-in-matri

编辑： dpb 2018-8-12

A =[
   2     3     4     5     6     7
   2     3     4     5     6     7
   2     3     4     5     6     7
   2     3     4     5     6     7
   2     3     4     5     6     7
   2     3     4     5     6     7
   2     3     4     5     6     7
   2     3     4     5     6     7
   2     3     4     5     6     7
   2     3     4     5     6     7
   2     3     4     5     6     7
   2     3     4     5     6     7
   2     3     4     5     6     7
   2     3     4     5     6     7
   2     3     4     5     6     7
   2     3     4     5     6     7
   2     3     4     5     6     7
   2     3     4     5     6     7];
size(A)=   18  *   7
B=[2;3;4;5;7;9;]
size(B)=   6  *  1

The deleted row and column specified in matrix B........

I want to delete in A matrix ........

B(1)=2 ie 2 row and 2 column  delete in matrix A
B(2)=3 ie 3 row and 3 column  delete in matrix A
B(3)=4 ie 4 row and 4 column   delete  in matrix A

and so on............

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Rik 2018-8-12

You can't delete single elements in arrays. You could replace them by NaN, but as you didn't explain what you want to do, I don't know if that would fit your needs.

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

dpb 2018-8-12

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/414555-how-to-delete-multiple-row-and-column-in-matrix-a-and-delete-row-and-column-specified-in-matri#answer_332483

编辑：dpb 2018-8-12

在 MATLAB Online 中打开

On the assumption it really is to remove the full row/column, not the individual element, "Dead ahead" is sometimes the simplest...

B=sort(B,'descend');  % will need to remove rows/columns from back going forward
for i=1:length(B)
  A(B(i),:)=[];       % remove row
  A(:,B(i))=[];       % remove column
end

NB: Your example above will fail as B(end)>size(A,2)

If the intent is to remove the row even if there isn't such a column, then incorporate error testing or just use a try...catch block to skip the addressing error.

for i=1:length(B)
  try, A(B(i),:)=[]; catch,end       % remove row if extant, don't error
  try, A(:,B(i))=[]; catch,end       % ditto remove column
end