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From: dpb on 22 Jul 2010 22:38
Luna Moon wrote:
....

> I think your "ismember" is used wrongly...
> it has a bug...

I have no "ismember" and that was pasted directly from command window...

>> x=[1;1;2;1;2;3;NaN;NaN;3;2;NaN;NaN;NaN;4;1;5;2;NaN;3];
>> z=[nan;nan;x]
z =
NaN
NaN
1
1
2
1
2
3
NaN
NaN
3
2
NaN
NaN
NaN
4
1
5
2
NaN
3
>> idx=max(1,min(find(~isnan(z))))
idx =
3
>> all(isnan(z(idx:end))==isnan(x))
ans =
1
>>

--

From: Oleg Komarov on 23 Jul 2010 03:26
Luna Moon
> The key part is how to do back-fill fast!

% Final input example
TS = {
'1/1/2010' NaN
'1/2/2010' NaN
'1/5/2010' 2.3
'1/6/2010' NaN
'1/7/2010' NaN
'1/8/2010' 3.1};

% Find running streaks of NaN except the first
toFill = findseq(cell2mat(TS(:,2)),1); % on FEX findseq
toFill = toFill(isnan(toFill(:,1)) & toFill(:,2)~=1,:);

% Fill TS
TS(toFill(2):toFill(3),2) = TS(toFill(2)-1,2)
TS =
'1/1/2010' [ NaN]
'1/2/2010' [ NaN]
'1/5/2010' [2.30]
'1/6/2010' [2.30]
'1/7/2010' [2.30]
'1/8/2010' [3.10]

Oleg
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