grouping elements of a matix according to an increasing order of dates

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Hi all,
i have a matrix A which I have sorted according to the command zoi=sortrows(A, 3 ) and the result is zoi=
'PDL12' '01-01-2011' [ -0.0138]
'PDL13' '01-01-2011' [ 0.3529]
'PDL12' '01-11-2009' [ -0.0812]
'PDL13' '01-11-2009' [ -0.2377]
'PDL12' '04-10-2009' [ -0.0208]
And I would like to have
'PDL12' '04-10-2009' [ -0.0208]
'PDL12' '01-11-2009' [ -0.0812]
'PDL13' '01-11-2009' [ -0.2377]
'PDL12' '01-11-2009' [ -0.0812]
'PDL13' '01-01-2011' [ 0.3529]
In other words, i want to group all the elements that correspond to the earliest date, then all the elements that correspond to the date after the earliest one and so forth. Any suggestions?
thanks

Risposta accettata

Thomas
Thomas il 24 Mag 2012
a={ 'PDL12' '01-01-2011' [ -0.0138]
'PDL13' '01-01-2011' [ 0.3529]
'PDL12' '01-11-2009' [ -0.0812]
'PDL13' '01-11-2009' [ -0.2377]
'PDL12' '04-10-2009' [ -0.0208]}
d=datenum(a(:,2),'dd-mm-yyyy');
[l,idx]=sortrows(d);
a(idx,:) % output

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