delete and handling matrix

hi,

I have matrix in the insert.I would like:

1) a cycle if/for that if MAtrix(:,8)<3 and matrix(:,6) different zero, delete this line in the matrix.

2)a cycle for/if that IF matrix (:,8)<3 in this lines matrix(:,6) must be 0.

thanks bye

Answer 1

[Adam Danz]

To identify rows of a matrix where column 8 is less than 3 and column 6 is not zero,

rowIdx = (matrix(:,8) < 3) & (matrix(:,6) ~= 0); 

where 'rowIdx' is a vector of row numbers that satisfy those conditional statements.

To remove those rows from the matrix,

matrix(rowIdx, :) = []; 

To identify rows of at matrix where column 8 is less than 3 and column 6 is equal to zero,

rowIdx2 = (matrix(:,8) < 3) & (matrix(:,6) == 0); 

[Giuseppe Antonacci]

thanks, one other thing:

a cycle for example

if matrix(:,8)<3

matrix(:,6)=0

end

but this doesn't works.

[Adam Danz]

I'm not sure what you mean by 'a cycle'.

Please look at my 3rd line of code to see how I constructed that line. You must use two equal signs.