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Michael Adelman
Michael Adelman 2012-8-12
关闭： MATLAB Answer Bot 2021-8-20
Hello,
I read this example: http://www.mathworks.com/help/toolbox/daq/brty0qx-1.html
and have a question about it:
Before I put data to 'ao' they use:
data = zeros(4000,1);
why put zeroes to the entire vector? How is it possible that I able to hear any sound after zeroing 'data'?
Thanks,

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回答（2 个）

Walter Roberson
Walter Roberson 2012-8-12
The data being used there is example data. Initialize "data" to whatever contents you want (but make sure that it is within range for the device.)
Michael Adelman
Michael Adelman 2012-8-12
Hello Walter,
I don't understand, zeroing 'data' is used for initialize only?
Thanks,
  2 个评论
Walter Roberson
Walter Roberson 2012-8-12
The code example is
data = zeros(4000,1);
putdata(ao,data)
start([ai ao])
Here, "data" is being initialized to something, just for illustration purposes. You could have initialized to 1's or to pi or to 42 if you wanted:
data = 42 * ones(4000,1);
putdata(a0, data); %queue's the 42's
start(a0);
If you already have a vector, then use it:
putdata(a0, YourColumnVector);
start(a0);

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