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removechannel

Remove channel from device interface

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Syntax

removechannel(d,idx)

Description

example

removechannel(d,idx)removes the specified channels from the DataAcquisition interface. If the DataAcquisition has channels with indices higher than the channels being removed, they are renumbered to fill the empty gaps left by the removal, but the channel names do not change.

Examples

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Remove channels from a DataAcquisition and note the index changes.

d = daq("directsound"); addinput(d,"Audio0","1","Audio"); addinput(d,"Audio1","1","Audio"); addoutput(d,"Audio3","1","Audio"); addoutput(d,"Audio6","1","Audio"); d.Channels
index Type Device Channel Measurement Type Range Name _____ ______ ________ _______ ________________ _______________ _____ 1 "audi" "Audio1" "1" "Audio" "-1.0 to +1.0 " "ch1" 2 "audi" "Audio0" "1" "Audio" "-1.0 to +1.0 " "ch2" 3 "audo" "Audio3" "1" "Audio" "-1.0 to +1.0 " "ch3" 4 "audo" "Audio6" "1" "Audio" "-1.0 to +1.0 " "ch4"
removechannel(d,2) d.Channels
index Type Device Channel Measurement Type Range Name _____ ______ ________ _______ ________________ _______________ _____ 1 "audi" "Audio1" "1" "Audio" "-1.0 to +1.0 " "ch1" 2 "audo" "Audio3" "1" "Audio" "-1.0 to +1.0 " "ch3" 3 "audo" "Audio6" "1" "Audio" "-1.0 to +1.0 " "ch4"

Note that after removal of the second channel, the remaining channels are numbered 1, 2, and 3. The channel names are not changed.

Remove all remaining channels.

removechannel(d,[1:length(d.Channels)])

Input Arguments

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DataAcquisition接口, specified as aDataAcquisitionobject, created using thedaqfunction.

Example:d = daq()

Channel index, specified as a numeric scalar or vector. Removing a channel shifts down the indices of remaining higher channels, but does not change the channel names. Do not confuse the channel index in the DataAcquisition with the channel ID of the data acquisition device.

Example:[1,3]

Data Types:single|double|int8|int16|int32|int64|uint8|uint16|uint32|uint64

Version History

Introduced in R2020a

See Also

Functions