Formulation to Matlab code

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Maroco Sc
Maroco Sc 2019-5-14
回答： Steven Lord 2019-5-14
How to write this formulation in Matlab:
2.JPG
is it :
for i=1:N
S(i) = -PT(i) * log(PT(i));
end
  2 个评论
Dimitris Kalogiros
Dimitris Kalogiros 2019-5-14
What is the base of the logarithm? Is it 10 ? If so, then you must use log10() .
Maroco Sc
Maroco Sc 2019-5-14
I have checked several papers, they did not mention the base of logarithm. if it is 10, then the code will be:
for i=1:N
S(i) = -PT(i) * log10(PT(i));
end
Right?

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采纳的回答

Steven Lord
Steven Lord 2019-5-14
There's no need to loop. The log and log10 functions can operate on arrays of data, and as long as you use element-wise multiplication you can do this in one line. [Actually, I'll need two; one to create sample data and one for the actual operation.]
PT = 10*rand(10);
S = -PT.*log10(PT);
You can compare this with the result of doing the same operation one element at a time to see if they're different.
S2 = zeros(size(PT));
for whichelement = 1:numel(PT)
S2(whichelement) = -PT(whichelement).*log10(PT(whichelement));
end
S-S2

更多回答（1 个）

Raj
Raj 2019-5-14
Since your equation asks for 'log' not 'ln' , I think the code should be:
for i=1:N
S(i) = -PT(i) * log10(PT(i));
end

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