Calculate the entropy of a special value in one column

I exactly wanted to know that how I can caculate the entropy of different values in a column

For example assume I have two columns

1.Water pipe type (CICL,DICL) and

2.the class type (y=0:fail,Y=1 non-fail)

I want to know how I can caculate the entropy of for example CICL pipelines based on their class type.

Actually the main set would be for example CICL data by y=0 and y=1 something like R={CICL1 ,CICL2}

How can I calculate the entropy of each of value of a column regards to the value of another column

Regards

Answer 1

[Youssef Khmou]

hi, try :

 R=randn(100,2); %  two columns

 e1=entropy(R(:,1)); % CICL

 e2=entropy(R(:,2)); % DICL

[Mojgan]

Thanks for your answer

But CICL and DICL are two value of one column not two different columns and each of these values are belong to a class which is identified in another column.I want to calculate the entropy of each one related to their class

for example if we have 20 CICL.4 of them belong to class 1 and 16 of them belong to class 2.sort of changing the CICL as a new column with valuse of 1 and 2

[Youssef Khmou]

hi, ok try to delimit the vector:

 e1= entropy(CICL(1:4));
 e2=entropy(CICL(5:end));

fine?