# Template:Calculate increment/doc

From MidsouthMakers - Memphis Area Hackerpace

## What it does

Calculates suitable increments for {{scalemarkers}}. Increments are 1, 2 or 5 times an appropriate power of 10.

Variable 1 = from; Variable 2 = to.

Examples:

`"{{calculate increment|10|30}}"`

gives "2" [1]

## Problems it has

It doesn't deal with small (<10) scales yet.

## How it does it

First we need to select the "base value" - i.e. what we're going to multiply by the power of 10. We use the following brackets:

- 14<35: 20
- 35-70 : 50
- 70->14: 10

To generate the first two digits is quite laborious. This code generates a suitably rounded number; we need to divide that by 10 *n* times.

`1 round (2-1)}}`

1

Then we need to select the power of 10.

0; 10