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 "ordinary" or Euclidean distance between A and Z
Basic arrays operations.
Side of an equilateral triangle
Back to basics - mean of corner elements of a matrix
Clean the List of Names
Find the numeric mean of the prime numbers in a matrix.
Indexed Probability Table
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