Adding names to each row automatically

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DARLINGTON ETAJE 2019-8-28

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https://ww2.mathworks.cn/matlabcentral/answers/477945-adding-names-to-each-row-automatically

评论： DARLINGTON ETAJE 2019-8-28

Imagine this

A=[2;4;3;1;3;4;1;3];
B=[-1;3;-4;-2;8;-9;1;-5];
E=zeros(8,1);
% such that 
for i=1:8
    if B(i)<0
        E(i)='Bad';
    elseif B(i)>0
        E(i)='Good';
    end
end
D=[A B E];

How do I find D...I want to label each row in D bad or good based te value in B...negative are for Bad while positive are for Good

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Answer 1

Adam Danz 2019-8-28

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编辑：Adam Danz 2019-8-28

If you want to form a matrix at the end, you'll need to keep the variables as numeric where "good" equals 1 and "bad" equals 0. That offers other benefits during analysis, too.

E = B > 0; 
D=[A B E];

If you'd rather use strings,

E = cell(size(B)); 
E(B>0) = {'Good'}; 
E(B<0) = {'Bad'}; 

Then put it in a table

T = table(A,B,E);

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Adam Danz 2019-8-28

编辑：Adam Danz 2019-8-28

Note that if any elements of B equal 0, they will not be categorized as good or bad. To get around that, you could use <=0 or >=0 depending on how values of 0 would be interpretted.

DARLINGTON ETAJE 2019-8-28