# সাঁচ:Calculate increment/doc

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## Usage

This template takes two numbers and calculates a suitable increment for {{scalemarkers}} based on the difference between these numbers. Increments are 1, 2 or 5 times an appropriate power of 10.

These numbers, the from value and the to value, are input as unnamed parameters.

`{{calculate increment|`p1`|`p2`}}`

The absolute value, d, of the difference between these is calculated.

d = | p1p2 |

This can be expressed in scientific notation as follows.

d = a × 10n

Where 1 ≤ a < 10 and n is an integer.

The output of the template is as follows.

 For 1 ≤ a < 1.35 the output is the number 1 × 10n − 1 For 1.35 ≤ a < 3.45 the output is the number 2 × 10n − 1 For 3.45 ≤ a < 6.95 the output is the number 5 × 10n − 1 For 6.95 ≤ a < 10 the output is the number 1 × 10n
Note
• The values are returned as ordinary numbers (for use in other templates) not in scientific notation (e.g. 5000 not 5 × 103).
• The template code actually uses 1.4, 3.5 and 7 as cut offs but these are reduced by 0.05 due to rounding.
Examples
• `"{{calculate increment|1|5}}"` gives "0.5" 
• `"{{calculate increment|10|23}}"` gives "1" 
• `"{{calculate increment|10|23.5}}"` gives "2" 
• `"{{calculate increment|100|300}}"` gives "20" 
• `"{{calculate increment|1010|1030}}"` gives "2" 
• `"{{calculate increment|3550|7450}}"` gives "500" 
• `"{{calculate increment|101000|889330}}"` gives "100000" 
Technical details

The main template page calculates d, the absolute value of the difference between the two inputs. Using {{order of magnitude}} the order of magnitude, n, of d is calculated. d and 10n − 1 are sent as parameters 1 and 2 respectively to a subpage, {{calculate increment/calc}}. This subtemplate uses a `#switch` to determine the correct factor, 1, 2, 5 or 10, then multiplies by 10n − 1.