====Filter====

Deletes frames and table rows based on filter conditions.

===Parameters===

^Name^Default^Meaning^
|keep||Remove all timeframes or rows unless this condition is **true**|
|remove||Remove all timeframes or rows where this condition is **true**|

===Description===

This layer is generally used to remove time, rows and timeframes that don't match specific conditions - for example, when a machine is stopped.

If you give a **keep** rule, any items that //fail// the test are kept and others are discarded. If you give a **remove** condition, any items that //pass// the test are removed.

===Example===

If the frame contains the following table of data...

^Time^Machine.Speed^Machine.Voltage^Machine.Current^
|09:00AM|0|0|0|
|09:10AM|0|240|3.2|
|09:20AM|15|240|1.5|
|09:30AM|18|240|1.5|
|09:30AM|17|240|1.5|
|09:30AM|17.5|240|1.5|

<code javascript>
{
   "type": "filter",
    "keep": "{Machine.Speed} > 0"
}
</code>

The first two table rows will be removed.