Cleaning Matrix

Hi,

I have the following matrix called Data(size=n*1) (actually tenth of them) that I need to clean. The idea is simple:

 If there is a number then no change
 If there is not a number then, I replace by:
     the previous number, if there is one.
     the next number, if there is no previous number.

Example Data matrix

Data=
[]
[]
20
[]
25
[]
100
Result=
20
20
20
20
25
25
100

Your help would be much appreiated.

Thanks

Xavier

Answer 1

[Andrei Bobrov]

Data={[]
[]
20
[]
25
[]
100};

t = ~cellfun(@isempty,Data)
Data(1) = Data(find(t,1,'first'))
t = [true;t(2:end)]
idx = cumsum(t)
D1 = Data(t)
out = D1(idx)

[Xavier]

It works nicely. Thanks

Answer 2

[Walter Roberson]

It is not possible to construct such matrices in MATLAB.

Are you using cell arrays? If so then if the empty matrix shows up then should only the first element of the previous / next number be copied, or should it be full cell entry that is copied?

Or where you show [] in your example, is that really NaN "not a number" ?

Does NaN ("not a number") count as being a number for your purposes? E.g., if you had [] nan 20 then should that become nan nan 20 or should it become 20 20 20 ?