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')
Magic is simple (for beginners)
Return area of square
Read a column of numbers and interpolate missing data
Replace NaNs with the number that appears to its left in the row.
Find relatively common elements in matrix rows
Maximum running product for a string of numbers
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