How to replace 0 value with 3 in Matlab

Hello, I hope you are doing well, I am trying to do two thing.

1. Find the number exist in fifth column of data e.g 0,1,2

2. Replace the 0 value in fifth column to 3

Answer 1

[KSSV]

c5 = Dataset(:,5) ;
% Find the number of 0, 1, 2 
idx = c5 == 0 | c5 == 1 | c5 == 2 ;  % gives logical indices 
nnz(idx)     % this gives total number 
% Replace 0 with 3 
c5(c5==0) = 3 ; 

[Med Future]

@KSSV the output c5 only shows indexes not all the dataset value for example remaining four columns

[Med Future]

@KSSV why u use the following command if i have other indexes till 10 how it will work

idx = c5 == 0 | c5 == 1 | c5 == 2 ; % gives logical indices