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')
given 3 sides, find area of this triangle
Sum all integers from 1 to 2^n
Remove NaN ?
Find the sum of the elements in the "second" diagonal
Add two numbers
Determine whether a vector is monotonically increasing
Most nonzero elements in row
Word Counting and Indexing
Find all elements less than 0 or greater than 10 and replace them with NaN
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