Z is a 2-D object array of (name, value, count) rows. Build a record array from it and return the col2 (float) values:
Z
(name, value, count)
col2
col1, col2, col3
S8, f8, i8
Input
[['Hello' '2.5' '3'] ['World' '3.6' '2']]
Output
[2.5 3.6]
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