Error with Audiowrite Struct contents reference from a non-struct array object.

For some reason when ever I run my code I collect data and am able to plot it but I get this error once I try saving the data using audio write:

*Struct contents reference from a non-struct array object.

Error in audiovideo.internal.FilePath/get.Absolute (line 119) pathstr = pathInfo.Name;

Error in audiowrite>validateFilename (line 305) if isempty(filepath.Absolute)

Error in audiowrite (line 105) [props.filename, fileExisted] = validateFilename( props.filename );

Error in tubetest (line 41) audiowrite(filename, data(:,2), Fs,'BitsPerSample',24)*

My code is

if true
filename=sprintf('extra sound data/tube_sounds1.wav')
%
NT=30000; % number of periods per frequency point used to set duration to 30 second sample
A=(.01) %amplitude in V
st = daq.createSession('ni'); %turns on the data aquisiontion hardware by Ni
Fs=88200; % Sample rate for output signal
st.Rate = Fs; % Sample rate for input signals
Ts=1/Fs; %time between samples, (100k)^-1 sec/sample
f=1000; %sets a reference frequency used only for time purposes
%
addAnalogOutputChannel(st,'cDAQ1Mod1',0,'Voltage'); % unused just quirk of hard ware
addAnalogOutputChannel(st,'cDAQ1Mod1',1,'Voltage'); % unused just quirk of hard ware
ch1 = addAnalogInputChannel(st,'cDAQ1Mod2',0,'Voltage'); % mic 1
ch2 = addAnalogInputChannel(st,'cDAQ1Mod2',1,'Voltage'); % mic 2
ch3 = addAnalogInputChannel(st,'cDAQ1Mod2',2,'Voltage'); % mic 3
ch4 = addAnalogInputChannel(st,'cDAQ1Mod2',3,'Voltage'); % mic 4
%
t=0:Ts:Ts*(fix(Fs/4)-1); % this is the time vector initial waiting time = 0.25 seconds bringing total to 30.25 seconds
outputSignalcos=t*0; unused just quirk of hard ware
outputSignalsin=t*0; unused just quirk of hard ware
for nf=1:length(f) %left over from old code we only have one f now and its 1000 Hz
  tn=0:Ts:(NT/f(nf)-Ts); %time vector. NT/f(nf) is the amount of time that NF (30000) periods takes so 30 seconds
  outputSignalcos = [outputSignalcos A*cos(2*pi*f(nf)*tn)]; % needed for collecting data quirk of hardware
  outputSignalsin = [outputSignalsin A*sin(2*pi*f(nf)*tn)]; % needed for collecting data quirk of hardware
  t=[t tn+t(end)]; 
en%d
%
%%-- Perform Frequency sweep -- 
disp(['performing frequency sweep...'])
queueOutputData(st,[outputSignalcos' outputSignalsin'])
data=st.startForeground; %starts collecting data
%
size(data) % returns 2668050 4 which is 30.25 seconds of 88.2 Khz sampled data
plot(data(:,2)) %plots the data from mic 2 we see good sound data that falls in between +-1
%
audiowrite(filename, data(:,2), Fs,'BitsPerSample',2
end

Answer 1

[Geoff Hayes]

Massey - is extra sound data/ a valid path from within the current directory? Is / valid for your OS? Try giving the full path name and/or create a folder name without any spaces.