Formulas 1.2. Numeric expressions

All the formulas whose outcome is a number are called numeric expressions. For the following examples, all the outcomes can be checked with the calculator.

### Examples with numbers

Some numeric expressions involve numbers only:

8*17
computes a multiplication. Outcome: 136.
2^10
computes the tenth power of 2. Outcome: 1024.
sqrt (2) / 2
computes the square root of 2, and divides the result by 2. Outcome: 0.7071067811865476.
sin (1/4 * pi)
computes the sine of π/4. Outcome: 0.7071067811865476 (again).

### Examples with strings

Some numeric expressions compute numeric properties of strings:

length ("internationalization")
computes the length of the string "internationalization". Outcome: 20.
index ("internationalization", "ation")
computes the location of the first occurrence of the string "ation" in the string "internationalization". Outcome: 7, because the first letter of "ation" lines up with the seventh letter of "internationalization". If the substring does not occur, the outcome is 0.

### Examples with arrays

Some numeric expressions compute numeric properties of numeric vectors:

size ({ 40, 70, 60, 50 })
computes the length of the vector { 40, 70, 60, 50 }, i.e. the number of its elements. Outcome: 4.
mean ({ 40, 70, 60, 50 })
computes the mean of the four numbers 40, 70, 60 and 50. Outcome: 55.