replace number for specific column in string using (strrep & if)

i have string 1,2,3,4,5,6,5

          4,5,6,8,5,8,6

text string 2*7

at the beginning the 2*7 is strings in text file it is not array so put this text into array to deal with a number (str2double)---->to be [ ]

i want to replace only last column 5 and 6 replacing 1 , 2 (specific column 7)

s1=strrep(st,'5','1');

s2=strrep(s1,'6','2');

we have more than one 5 and 6 number i want replacing only the last column (column 7) ?

Answer 1

[Azzi Abdelmalek]

A=[1,2,3,4,5,6,5;4,5,6,8,5,8,6]
c7=A(:,7)
c7(ismember(c7,5))=1
c7(ismember(c7,6))=2
A(:,7)=c7

[Azzi Abdelmalek]

Do you have a string? a cell array? or a text file?

[Adam Aust]

string ( text) 1,2,3,4,5,6,5 separated by comma, each line rows 7 columns

          4,5,6,8,5,8,6