Too many output arguments ERROR

Question

Keir Hunter 2020-7-24

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/570217-too-many-output-arguments-error

评论： Keir Hunter 2020-7-24

I am making a function to run venting on a pump system. I am getting an error using the matlab timer object. I have the script below and the error let me know if you can help. Thanks!

function vent_man(sec)
    v = visa('agilent', 'ASRL1::INSTR');
    fopen(v);
    hexdata_open = ['02'; '80'; '31'; '32'; '32'; '31'; '31'; '03'; '42'; '33'];
    decdata_open = hex2dec(hexdata_open);
    hexdata_close = ['02'; '80'; '31'; '32'; '32'; '31'; '30'; '03'; '42'; '33'];
    decdata_close = hex2dec(hexdata_close);
    t = timer;
    t.StartFnc = fwrite(v, decdata_open, 'uint8');
    t.StopFnc = fwrite(v, decdata_close, 'uint8');
    t.Period = sec;
    start(t);
    fclose(v);
    delete(v);
end

P.S. I have already tried changing the first line to function v = vent_man(sec) which did not work

Error using icinterface/fwrite
Too many output arguments.
Error in vent_man (line 9)
    t.StartFnc = fwrite(v, decdata_open, 'uint8');

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Answer 1

Cam Salzberger 2020-7-24

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https://ww2.mathworks.cn/matlabcentral/answers/570217-too-many-output-arguments-error#answer_470569

编辑：Cam Salzberger 2020-7-24

在 MATLAB Online 中打开

Keir,

The fwrite method for that object doesn't seem to return an output argument. Always try to make sure that you are both using the correct function and using the function correctly.

In this case, it looks like you want to make a function handle for the timer functions, not call the function immediately. So you probably want something more like:

t.StartFnc = @(~,~)fwrite(v, decdata_open, 'uint8');

and similar for the other

-Cam