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')
Find the numeric mean of the prime numbers in a matrix.
Reverse the Words (not letters) of a String
Replace May with April
Replace multiples of 5 with NaN
Back and Forth Rows
Return the largest number that is adjacent to a zero
Encode Roman Numerals
What is the next step in Conway's Life?
Find common elements in matrix rows
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