"-" function:

• Can also be called as nas_minus

• Can also be called as nas_take_away

• Can also be called as nas_substruct

If there are two numeric arguments, substract the second argument from the first one if both are number. If there is one numeric arguments, return the negative of that number.

Examples:

• running: ("-" "100", "3") will give: "97"

• running: ("-" "10", "3.2") will give: "6.8"

• running: ("-" "10") will give: "-1E+1"

• running: ("-" "-11.3") will give: "11.3"

• running: ("-" "10", "text") will return nothing

• running: ("-" null, "6") will return nothing

• running: ("-" {}) will return nothing