problem with 'PLOT' while plotting data acquired from NI DAQ Board
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I am trying to acquire data (Square wave with certain amplitude) from an amplifier unit using NI DAQ Board and trying to plot(amplitude v/s time) the same. I dont have a hardware trigger for this circuitry. When i execute the program i am getting an error msg.
'Undefined function 'Plot' for input arguments of type 'double'.
Error in dataread (line 36)
Plot (time, data);
below is my code. can you please help me on how to over come this error.
i
p.TriggerTimeout = 2; %If there is no trigger signal after 2 seconds time out
p.no_of_measurements = 50;
p.SampleRate = 2000000; %Maximum samplerate for NI USB-6361
p.InputRange = [-2 2]; %Amplifier output DAQ AI options [-10 10], [-5 5], [-2 2],[-1 1],[-500 500], [-200 200], [-100 100]
p.AInputChannel = 0;
p.Frequency = 5; %in kHz
p.noise = 0.065;
p.no_of_measurementRuns = 6;
ai = analoginput ('nidaq','Dev1');
ch = addchannel(ai,p.AInputChannel,{'PD'}); %Connect the amplifier output to AI0(+) and AI0(-) NRSE
ch.InputRange = p.InputRange;
ai.SampleRate = p.SampleRate; %samples per second
%set(ai, 'TriggerType','Software');
%set(ai, 'HwDigitalTriggerSource', 'PFI0');
%set(ai, 'TriggerCondition','PositiveEdge');
%set(ai,'LogFileName','file01.daq')
%set(ai,'LoggingMode','Disk&Memory')
duration = 10;
disp('press a key to acquired data')
w = waitforbuttonpress;
if w == 0
disp('Button clicked')
else
disp('Key pressed')
end
start (ai);
wait (ai, duration+1);
[data, time] = getdata (ai);
Plot (time, data);
%[data, time] = daqread ('file01.daq');
0 Comments
Answers (1)
Mischa Kim
on 12 Feb 2014
Edited: Mischa Kim
on 12 Feb 2014
Shailendra, plot needs to be spelled lower-case:
plot(time, data)
4 Comments
Mischa Kim
on 13 Feb 2014
Excellent. Would you mind formally accepting the answer, sort of as "problem solved"?
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