MATLAB: I can not use some functions for NI device

Question

[EDIT: 20110720 23:36 CDT – reformat – WDR]

Hi, guys,

I found I can not use some functions when I tried to acquire data with ni product usb-6251.

for example,

s = daq.createSession('ni'),daq.getDevices,addAnalogInputChannel.

I can not use them, the error is: Undefined variable "daq" or class "daq.createSession". Undefined function or variable 'daq'.and so on. what's the matter?

I can use analoginput('nidaq','Dev1'),but I can not add channels.

please

thank you

Answer 1

I believe that after

s = daq.createSession('ni')

you would need to use

s.addAnalogInputChannel(...)

to add a channel. See the example here