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replacing the NaN with specific values

Asked by tzaloupas on 14 Mar 2013

Dear all,

I have the following matrix

   A={'country'  'values'
       'E'    '1'  
    'E'    [NaN]
    'E'    [NaN]
    'E'    '2'  
    'E'    [NaN]
    'E'    [NaN]
    'E'    [NaN]
    'E'    [NaN]
    'E'    [NaN]
    'E'    '3'  
    'E'    [NaN]
    'E'    [NaN]
    'E'    [NaN]
    'E'    [NaN]
    'EE'    [NaN]
    'E'    '4'
     'I'    '1'  
    'I'    [NaN]
    'I'    [NaN]
    'I'    '2'  
    'I'    [NaN]
    'I'   [NaN]
    'I'    [NaN]
    'I'    [NaN]
    'I'    [NaN]
    'I'    '3'  
    'I'    [NaN]
    'I'    [NaN]
    'I'    [NaN]
    'I'   [NaN]
    'I'    [NaN]
    'I'    '4'
    'I'    [NaN]
    'I'    [NaN]
    'I'    [NaN]
    'I'   [NaN]
    'I'    [NaN]
    'I'    '5'
     'K'    '1'  
    'K'    [NaN]
    'K'    [NaN]
    'K'     '2'  
    'K'     [NaN]
    'K'    [NaN]
    'K'     [NaN]
    'K'     [NaN]
    'K'     [NaN]
    'K'    [NaN]   
   'K'    [NaN]
    'K'    '3'
    'K'     [NaN]
    'K'    [NaN]
    'K'    [NaN]
    'K'     '4'
    'K'    [NaN]
    'K'     [NaN]
    'K'     [NaN]
    'K'    [NaN]
    'K'     [NaN]
    'K'     '5'
};

The first column describes the countries and the second the values corresponding to each country.

For each country the initial value is always '1'. For each country I want to replace the NaNs with the value that is before them.

So for the first country I want to have

'E'    '1'  
  'E'   '1' 
  'E'    '1' 
  'E'    '2'  
  'E'   '2' 
  'E'    '2' 
  'E'    '2' 
  'E'    '2' 
  'E'    '2' 
  'E'    '3'  
  'E'    '3' 
  'E'    '3' 
  'E'    '3' 
  'E'    '3' 
  'EE'    '3' 
  'E'    '4'
    for country I I want to have
        'I'    '1'  
    'I'    '1' 
    'I'   '1' 
    'I'    '2'  
    'I'   '2' 
    'I'  '2' 
    'I'    '2' 
    'I'   '2' 
    'I'    '2' 
    'I'    '3'  
    'I'   '3'  
    'I'    '3'  
    'I'    '3'  
    'I'   '3'  
    'I'    '3'  
    'I'    '4'
    'I'    '4'
    'I'   '4'
    'I'    '4'
    'I'   '4'
    'I'   '4'
    'I'    '5'
    and so so..
    I am trying to come up with a code but I got stuck
    Is there any way of doing that
    My real vector contains 300 countries, so doing manual is quite tedious
    thanks in advance

0 Comments

tzaloupas

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1 Answer

Answer by Andrei Bobrov on 14 Mar 2013
Edited by Andrei Bobrov on 14 Mar 2013
Accepted answer
A1 = A(2:end,:);
t = ~cellfun(@isnan,A1(:,2));
k = A1(t,2);
A(2:end,2) = k(cumsum(t));

added on comment

A1 = A(2:end,2);
t = cellfun(@ischar,A1);
A1(t) = cellfun(@str2double,A1(t),'un',0);
t1 = ~cellfun(@isnan,A1);
k = A1(t1);
A(2:end,2) = k(cumsum(t1));

4 Comments

tzaloupas on 14 Mar 2013

Andrei please help me...

Andrei Bobrov on 14 Mar 2013

see part 'added..' in my answer

tzaloupas on 14 Mar 2013

PERFECT!

Andrei Bobrov

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