Data interpolation problem for excel file

I had a excel file having 500 rows and 3 columns. In first column the data should be within the range of 200-250 but there are some data which are not in this range.So replace those data by using previous data history with in the specific range. Similarly for second column the data range should be 100-150 and replace the unwanted data and also do the same for column third. Thanks in advance

Answer 1

[Sammit Jain]

Hi Mukesh,

I'm assuming that 'previous data history' means 'previous value in that column which was within this range'. This seems like a good application of the fillmissing function in MATLAB

First find the values which are not in your desired range using simple comparison. Set these values to any form of missing value in MATLAB (NaN, [], etc). Once this is done, just use fillmissing with the kind of technique you require for the filling.

Here's a small example:

A = [10 15 17 18 45 11 14 87 43]';

A(A>20) = NaN;

fillmissing(A,'previous');

The original column A is:

A =

    10
    15
    17
    18
    45
    11
    14
    87
    43

After you run the code, it becomes:

      10
      15
      17
      18
      18
      11
      14
      14
      14

Hope this helps.

[MUKESH KUMAR]

For replacing a data, use previous 4-5 data sets and based on that find/predict the new data within that specific range. Use loop for all 3 column. Thanks