What does the function machine do with numbers 1, 2, 4, and 7?

[nonstop]

If we have function machine, which change numbers 1,2,4 and 7 like this

1 --> 4
2 --> 8
4 --> 16
7 --> 28

How i know simple, what is function, what machine use?

( I don't speak very well english )

 

[berkeman]

From a numerical perspective, it looks like a straightforward scaling of the input number to get the output number (question -- what is the scale factor?).

From a binary state machine perspective, it looks like a shift left by a constant number of bits. How many bits?

 

[loom91]

Machine? What are you talking about? Specifying a function at only 4 points does not specify the function, but for simple purposes you can consider the function to be a constant multiple of the input.

 

[murshid_islam]

How i know simple, what is function, what machine use?

what did you mean by that question? can you please elaborate?

 

[lo2]

What about:

$$f(x)=4x$$

As:

$$f(1)=4 f(2)=8 f(4)=16 f(7)=28$$

 

[JonF]

What lo2 said with a domain of {1,2,4,7}