The Select CHOP selects and renames channels from other CHOPs of any CHOP network. You can select the channels from control panel gadgets like sliders and buttons. It retrieves channels from one or more CHOPs.
It selects only the channels you specify. Example: "
c2 c5 c3 c3" will result in 4 channels, the last two identical, all in the specified order.
There are two ways of getting channels - through the CHOP and Channel Name parameters or directly from a CHOP connected to its input. All extract and renaming options apply when using the CHOP and Channel Name parameters instead of the wired input.
See Pattern Matching for CHOP and channel selection.
It optionally renames the channels. See Pattern Expansion for channel name patterns you can use to name multiple channels.
(The Select CHOP gets channels from any CHOP, the Fetch CHOP gets parameters of any OP.)
CHOP - The source(s) of the channels. (Assuming the CHOP is not directly connected).
Channel Names - The names of the channels to keep. Name patterns may be used. Ex:
chan[1-5], *x, /ch/ch1/wave1/chan[xyz]
The order of the names determine the order of the output channels. If a channel is specified multiple times, it is included in the output multiple times.
Rename From - The channel pattern to rename. See Pattern Matching.
Rename To - The replacement pattern for the names. The default parameters do not rename the channels. See Pattern Expansion.
- Channel Names:
- Rename From:
- Rename To:
This example fetches channels
They are then renamed to to
See the Rename CHOP for a further description of rename patterns.
Align - This menu handles cases where multiple input CHOPs have different start or end times. All channels output from a CHOP share the same start/end interval, so the inputs must be treated with the Align Options:
- Auto - It will trim to the current [Time Slice] if there are any Time Slices, else it will do an Extend Min/Max.
- Extend to Min/Max - Find the earliest start and latest end, and extend all inputs to that range using the extend conditions. (See Extend Conditions).
- Stretch to Min/Max - Find the earliest start and latest end, and stretch every channel's start and end to that range.
- Shift to Minimum - Find the earliest start and shift all channels so they all start at that index. All channels are extended to the length of the longest one.
- Shift to Maximum - Find the latest end and shift all channels so they all end at that index. Extend all channels to the length of the longest one.
- Shift to First Interval - Shift all channels to the start of the first CHOP and sample all inputs using the first input's range.
- Trim to First Interval - Trim all channels to first CHOP's range.
- Stretch to First Interval - Stretch all channels to the first CHOP's range.
- Trim to Smallest Interval - Trim all channels to the smallest start/end interval. The start and end values may not come from the same channel.
- Stretch to Smallest Interval - Stretch all channels to the smallest start/end interval. The start and end values may not come from the same channel.
Automatic Prefix - When 2 channels have the same name, turning on this option will add the node's name (or the node's parent's name, etc.) as a prefix to the channel name. For example, if selecting a channel from
/wave2/chan1, the channels would be renamed
chan2 if this option is off. Once turned on the channels would be named
Standard Options and Local Variables