MATLAB sorting data and creating matrix by year - matlab

Question

I have the following data sample:
2001 1
2000 1
1974 1
2007 1
2007 2
2007 6
2007 3
1994 1
1986 1
2007 1
I want to sort the data by year and then plot the values. I wrote a code using for and find. However, using fprintf I got only the output in the command window, like this:
Ano-modelo 2009 | 88242 veiculos
Ano-modelo 2010 | 125822 veiculos
Ano-modelo 2011 | 132360 veiculos
Ano-modelo 2012 | 167984 veiculos
So, Is there some alternative way that, inside for loop, to create a matrix c = [year; sum_vehicles]?
My code is the following:
dados = dlmread('c:\experimental\frota_detran\frota-detran_total.dat');
ano = 1922:2015;
for i = ano
%procura somente os valores a cada ano
pro = find(dados(:,1)==i);
%lista somente os valores
qt = dados(pro,:);
%soma o ano modelo em questao
total = sum (qt(:,2));
%exibe os valores para cada ano modelo
fprintf('%s %d %s %d %s \n','Ano-modelo',i ,'|',total, 'veiculos');
end

Answer 1

Looks like you want the data sorted and aggregated:
[sorted ia ic] = unique(dados(:,1));
c = [sorted accumarray(ic, dados(:,2))];