map() truncation of integral results is confusing. [imported]

[cmaglie]

This is Issue 288 moved from a Google Code project.
Added by 2010-07-11T21:22:11.000Z by dmel...@gmail.com.
Please review that bug for more context and additional comments, but update this bug.

Original labels: Type-Defect, Priority-Medium, Component-Core

Original description

For example, map(x, 0, 100, 0, 1) returns 0 for x from 0 to 99, whereas one might expect 50-100 to yield 1. This could be corrected by changing the function's calculation to:

(x - in_min) * (out_max - out_min + 1) / (in_max - in_min + 1) + out_min

Or by clarifying the behavior and usage in the documentation (e.g. explaining that you want to use the just past the range you're interested in).