How can I use a logical array to remove and replace values in a corresponding data array?

Question

Steve Francis 2021-11-17

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1588939-how-can-i-use-a-logical-array-to-remove-and-replace-values-in-a-corresponding-data-array

评论： Matt J 2021-11-17

I have an array A (1280 x 1024) that has some rogue values that I want to remove and replace with a linear interpolation of the two nearest neighbouring elements (that are not rogue) in the column. (I call them 'rogue' rather than outliers because the values can appear ok statistically.)

I have a logical array TF (1280 x 1024) whose elements are true if the corresponding element in A is rogue.

How do I do create the corrected array, B?

Example (5 x 3 array shown for simplicity):

TF = 5×3 logical array
 0   0
 0   0
 0   1
 1   0
 0   0
A = 5×3
  46    32
  60    50
  51    59
  49    48
  55    66

I want the output to be:

The function 'filloutliers(A,'linear')' is close but that function seems to generate its own TF array whereas I want to implement the TF array that I already have.

I'm using the R2020a version of Matlab. Thank you.

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Answer 1

Star Strider 2021-11-17

1
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https://ww2.mathworks.cn/matlabcentral/answers/1588939-how-can-i-use-a-logical-array-to-remove-and-replace-values-in-a-corresponding-data-array#answer_833749

在 MATLAB Online 中打开

See if the fillmissing funciton produces the desired result —

TF = [0   0   0
      0   0   0
      0   0   1
      0   1   0
      0   0   0];
TF = TF == 1;                               % Create Logical Array From Numeric Array
A = [54    46    32
     48    60    50
     50    51    59
     51    49    48
     45    55    66];
A(TF) = NaN;                                % Set 'TF' Entries To 'NaN'
A = fillmissing(A, 'nearest')
A = 5×3
    54    46    32
    48    60    50
    50    51    48
    51    55    48
    45    55    66