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why this message error ?:Array indices must be positive integers or logical values

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jérôme TAÏEB
jérôme TAÏEB 2018-9-30
回答： Image Analyst 2018-9-30
Hi,
When i write this little script:
---------------------------------------------------------------------------------------------------------
demo matlab
t = (10:1:200)';
y = sin(2*pi*50*t)
z = y(t-10)
w = y+z
plot(t(1:50),w(1:50))
sound(w,Fs);
-------------------------------------------------------------------------------------------------------
there is a message error: message error: Array indices must be positive integers or logical values.
Howewer,when i write this:
-----------------------------------------------------------------------------------------------------
demo matlab
t = (0:0.001:100)';
y = sin(2*pi*50*t)
plot(t(1:50),y(1:50))
sound(y,Fs);
------------------------------------------------------------------------------------------------------
there is no message error.
Why?
thanks

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采纳的回答

Image Analyst
Image Analyst 2018-9-30

更多回答（2 个）

jérôme TAÏEB
jérôme TAÏEB 2018-9-30

Ok but

demo matlab

 t = (11:1:200)';
 y = sin(2*pi*50*t)

z = y(t-10)

w = y+z

plot(t(1:50),w(1:50))

sound(w,44000);

no longer presents an error message but no sound comes out!

Why ?

  3 个评论
显示 1更早的评论
Star Strider
Star Strider 2018-9-30
The sound is there. It is of too short a duration to notice:
signal_duration = (200-11)/44000
signal_duration =
0.00429545454545455
It only lasts for 4.3 milli-seconds!

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Image Analyst
Image Analyst 2018-9-30

See attached sound making demo. It doesn't make your sound but adapt it as needed.

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