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')
Sums with Excluded Digits
Column norms of a matrix
length of a vector
Solve a System of Linear Equations
Which doors are open?
Extract leading non-zero digit
Find all elements less than 0 or greater than 10 and replace them with NaN
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