what is the meaning of this instruction?

Question

lotus 2013-3-22

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https://ww2.mathworks.cn/matlabcentral/answers/68250-what-is-the-meaning-of-this-instruction

采纳的回答： Azzi Abdelmalek

y = -Inf*ones(size(x))

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Answer 1

Azzi Abdelmalek 2013-3-22

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https://ww2.mathworks.cn/matlabcentral/answers/68250-what-is-the-meaning-of-this-instruction#answer_79593

在 MATLAB Online 中打开

x=[1 2;3 4;5 6]
size(x)
ans =
   3     2     %  3 lines and 2 columns
ones(size(x))   % create 3x2 array with 1
ans =
   1     1
   1     1
   1     1
-inf*ones(size(x))
ans =
-Inf  -Inf
-Inf  -Inf
-Inf  -Inf

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lotus 2013-3-22

在 MATLAB Online 中打开

i understand your example.thank you.but,if the code is like below:

ptotdB = dbp(ptot);

in another file:

                                                                                              function y=dbp(x)
y = -Inf*ones(size(x));
nonzero = x~=0;
y(nonzero) = 10*log10(abs(x(nonzero)));

i don't understand this whole code.can you explain it in the simplest way?

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