Does "All the data still" mean, that the fields are not re-ordered? A lot of the solutions change the order of the fields.
Currently, Matlab has the function renameStructField.
When I run the test suite on my computer, this solution works. It passes the test suite.
This fails, if the fieldname to be replaced appears as part of another fieldname. Example: S.ab=1; S.a=2; renamefield(S, 'a', 'c')
Summing Digits within Text
letter yes yes & letter no no
Sum of first n terms of a harmonic progression
find the maximum element of the matrix
Remove all the consonants
Find relatively common elements in matrix rows
Which doors are open?
Swap the first and last columns
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