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[q,nd] = max(10*log10(P)); - this is used in spectrogarm . but can anyone tell me what is this ? and how length of q and nd is calculated?

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Biswajit Ojha
Biswajit Ojha 2017-7-19
评论： Walter Roberson 2017-7-19
[q,nd] = max(10*log10(P));

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Star Strider
Star Strider 2017-7-19
It transforms an argument of power ‘P’ to decibels, and returns in ‘q’ the first instance of the maximum power in decibels, and in ‘nd’ returns the index of that value.
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Star Strider
Star Strider 2017-7-19
Why do you say "the value of an array B"? Normally an array is multiple values, not a single value. Did you really mean to say "the values of an array B"?
What are the dimensions of A and B? How does B change in your loop? Is B a global variable that is declared global both in that routine, and in Sysmodel()??? And you change the value of the global variable B in Sysmodel? If B is declared only in your code you posted, then it will have the same value every time, unless you've intentionally left out critical parts of your code.
Walter Roberson
Walter Roberson 2017-7-19
sz = size(P);
dim = find(sz ~= 1);
sz(dim) = 1;
q and nd will be the size indicated by sz.
If P is a 2D array (not a vector), then q and nd will each be row vectors with as many columns as P had columns.

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