How to sum part of a column?

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Karl
Karl 2013-4-29
回答： Birabhadra Rout 2017-8-25
Hi. I am new to Matlab.
Does anybody know how I can calculate the column sum of row 1 and 2 in column 3 in the follwoing matrix (3+6)?
1 2 3
4 5 6
7 8 9

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采纳的回答

Kye Taylor
Kye Taylor 2013-4-29
编辑：Kye Taylor 2013-4-29
If your matrix is called A, then rows 1 and 2 in column 3 can be identified with the syntax
A( 1:2, 3 )
So sum it using the command
sum( A( 1:2, 3 ) )

更多回答（1 个）

Birabhadra Rout
Birabhadra Rout 2017-8-25
if i have a matrix of vecor 1 2 1 3 1 4 2 2 2 3 2 4 and i want to add each number in 2nd column with having similar data in 1 st column and i want to save it as 1 9 2 10 then how to do it ?

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