how to truncate specific rows and columns of matrix in matlab.

A = [10,20,30,40; ...
     20,30,40,50; ...
     30,40,50,60; ...
     40,50,60,70];

now i want to truncate the row no 2 and col no 2 and wants to get new matrix of 3x3? kindly help me

[Jan]

Please use meaningful tags. The question has no relation to "matlab compiler".

Answer 1

[Azzi Abdelmalek]

A(2,:)=[]
A(:,2)=[]

[hani]

dear. if i want to truncate more then one rows and columns then what i will do????........ because A(2,:)=[] A(:,2)=[] works only for one row and column.

[Azzi Abdelmalek]

Just specify the rows to delete. If you want to delete rows 2 and 4

rows_to_delete=[2 4]
A(rows_to_delete,:)=[]

[hani]

sir i have a matrix 10x10 and i want to remove row and col no 3,5,7,8,10 and wants to get 5X5 matrix there are different ways to truncate but i need that way in which original matrix should remain same and truncation process should done in a new metric, one solution of truncation..... B=A(:,2:7); C=B(2:7,:); that means we want entities from 2 to 7 remaining will truncate. but i need a specific row and col to delete........ and net matrix with new name???/?

[Steven Lord]

Rajinder singh wrote a flag that is more of a comment.

we can also delete columns by this method, but in case of columns deletion, the colon has to come first in the bracket, then comes the cols_to_delete

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Answer 2

[Andrei Bobrov]

out = A([1,3:end],[1,3:end])