"columns": [ ... { "headerGroup":"Set ranking", "headerCss":"headSetRanking", "header": "RPN", "filterable":true, "bindings": "rpn", "type": "int", "cellRenderer": "rpn", "width": 60, "level": 2, "readOnly":false "formula":"commonRpn" }, ...

It is possible to configure column so the values (cells) will be calculated automatically based on the other columns.

## Config file

Please follow this article, to learn where is the configuration file located, see: __Configure risksheet columns__

## Example: RPN Number

A reference example is the RPN columns where the value is calculates as value of Severity column multiplied by Occurence column, multiplied by Detection column.

RPN = Severity * Detection * Occurence

## Configuration

To configure the column formula you would need to:

- point a column to a formula definition
- define the formula

... "formulas":{ ... "commonRpn":"function(p){\n var value = p.item['occ']*p.item['det']*p.item['sev'];\n return value?value:null;}", ... }, ... "columns": [ ... { "headerGroup":"Set ranking", "headerCss":"headSetRanking", "header": "RPN", "filterable":true, "bindings": "rpn", "type": "int", "cellRenderer": "rpn", "width": 60, "level": 2, "formula":"commonRpn" }, ... ] ....

- You see that column.formula is pointing to formula ID: commonRpn
- commonRpn is a function defined in section called: formulas
- the function is defined in javascript language and needs to return a value (can be number, string, ...)

## Formula Function Parameter

In the example above you can see that the formula function takes as an input one parameter (here it is called *p*).

This parameter exposes:

**p.item**- a data array, that holds the values of rows. So in your formula, you can access the row (item) values by calling p.item[column.id]**p.cell**- a HTML DOM element, usually not used in formulas, but this is used typically in cellDecorators

## Store or Not-to-store the results into Work Item

You can configure the Risksheet to store the calculated columns in Polarion. To do so, mark the column as **"readOnly":false**

... "columns": [ ... { "headerGroup":"Set ranking", "headerCss":"headSetRanking", "header": "RPN", "filterable":true, "bindings": "rpn", "type": "int", "cellRenderer": "rpn", "width": 60, "level": 2, "readOnly":false, "formula":"commonRpn" }, ... ] ....

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