Using FIND to Identify the Location of an Item

You can find the location of an item in a vector if you know it's current value using the mathematical function FIND.

10 FIND 2.2 100 10 345.4 will return the value 3, as 10 is the third item of the vector.  FIND works with any expression that returns a vector.

When you know the location of an item you can replace the value using a simple APL expression.