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')
Back to basics 1 - Saving
Set the array elements whose value is 13 to 0
Area of an equilateral triangle
Find the 9's Complement
Number of Even Elements in Fibonacci Sequence
Determine if input is odd
Find state names that start with the letter N
Remove the vowels
Find the palindrome
Swap the first and last columns
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