accessing table data in different forms

Question

Ege am 25 Okt. 2014

0
Verknüpfen

Direkter Link zu dieser Frage

https://de.mathworks.com/matlabcentral/answers/160081-accessing-table-data-in-different-forms

Beantwortet: Ege am 26 Okt. 2014

Hi I have T table as follows.

LastName = {'Smith';'Johnson';'Williams';'Jones';'Brown'};
Age = [38;43;38;40;49];
FirstName = {'Amanda' ;'Brenda';'Carl'; 'Denis'; 'Ethan'};
Something = {'String1' ;'String2';'String2'; 'String1'; 'String5'};
Weight = [176;163;131;133;119];
FavoriteColor = {'blue' ;'red' ;'yellow'; 'orange' ;'colorblind' };
T = table(Age,FirstName,Weight,FavoriteColor,Something,'RowNames',LastName)
T.FavoriteColor= categorical(T.FavoriteColor);
T.Something= categorical(T.Something);

when I use

A=T(:,5);

I get a variable A which is a table as well. But when I use

A=T.Something;

I get a variable A which is a categorical value like the ones is column Something. I want to use loops so I need to use the first one with indices but I want the result in the second one. What should I do?

2 Kommentare
Keine anzeigenKeine ausblenden

Geoff Hayes am 25 Okt. 2014

Ege - what are you trying to achieve? You mention that you want to use loops, but what do you want to use the loops for?

Ege am 25 Okt. 2014

In MATLAB Online öffnen

Well I just started the project I will use it for many things but for now, I have divided my dataset into 2 tables which holds categorical and non categorical data. I'm currently using the categorical one and try to implement a histogram on that since usual histogram function does not work on categorical data. My dataset is huge so at first I will use the categorical column of the T table I mentioned in the question. When I use it like below, it works fine.

a=T.Something;
hist=zeros(size(a,1),1);
u=unique(a);
for i=1: size(a,1)
    for j=1: size(u,1)
        if isequal(a(i),u(j))
            hist(j)=hist(j)+1;
        end
    end
end
for i=1:numel(hist,1)
    if isequal(hist(i),0)
        hist(i)=[];
    end
end
histogram = table(u(:),hist(:));