objarray scale <obj> <factor> ?<index>?
Multiply by $factor all array items.
<obj> the objarray to be modified
<factor> a real value to multiply all values of the array
<index> optional integer (starting from 0) to multiply only this component of the array
The array doesn't change its type, e.g. an array of integers multiplied by a real factor will truncate the result again as integer.
Warning: the values of <obj> itself are modified, without creating another copy of the object
e.g.
set obj [objarray new doublearray -values {3.5 2.1 0.3 3.5 2.6 0.3}] -> 3.5 2.1 0.3 3.5 2.6 0.3 objarray scale $obj 2.5 -> 8.75 5.25 0.75 8.75 6.5 0.75