Change value to NaN element

Hi, i have a matrix 7938x498 with numerical and NaN values. I want to change value to some NaN elements but i don't know exactly their index in the matrix. I make an example to explain it better.

if i have a vector like this A=(NaN,NaN,NaN,NaN,NaN,1,5,7,9,NaN,NaN,NaN,NaN,5,5,53,3,NaN,NaN). How can i change the NaN values beetween 9 and 5 without change the others? Thanks

[Scott MacKenzie]

What you are asking for seems reasonable. However, can you describe the problem in more general terms. What if there are many sequences of numbers interspersed with NaN sequences?

[dpb]

Or, another way to ask the same question -- how do you determine which locations it is that are wanted to be changed? Is it based on the value of the element itself of, in the example given, because it is the sequence after the sequence of finite values and it doesn't matter that 9 is 9 or 5 is 5; just that they are finite?

[Giacomo Abrardo]

Yes, i have 498 stations and each column of the matrix i made shows the precipitation data of a station. From the first day of activity to the last they have several days of maintenance and they could have event more sequences of NaN elements for a single station. The problem is that i have to apply a recursive formula at any column and i want to change the NaN value with a numerical value of the nearest station.

[Giacomo Abrardo]

dqb i only need that they are finite. Doesn't matter the exact value

[Giacomo Abrardo]

that's part of the matrix. I need to change the value 3985 and 3989 from second column

Answer 1

[the cyclist]

Here is one way:

% The original data
A = [NaN,NaN,NaN,NaN,NaN,1,5,7,9,NaN,NaN,NaN,NaN,5,5,53,3,NaN,NaN];

% The indices of the numeric values
numericIndices = find(~isnan(A));

% The indices of the NaNs in the gap between the numeric values
gapIndices = setxor(min(numericIndices):max(numericIndices),numericIndices);

% Fill in the values you want to assign
A(gapIndices) = ... 

[Giacomo Abrardo]

that's work. Thank you very much