Multiplying Vector by Constant that Depends on Vector Elements

6 vues (au cours des 30 derniers jours)
Kyle
Kyle le 2 Nov 2011
Given a vector containing values 1 through 1000, I would like to multiply the vector elements by constant C1 if they range from 1-100, by constant C2 if they range from 100-200, etc...
Is there a simpler way to do this than iterating through the vector?
for i = 1:size(vector,2);
if vector(i) < 100
C = C1;
else if vector(i) < 200
C = C2;
end
result(i) = vector(i) * C;
end

Réponse acceptée

Jan
Jan le 2 Nov 2011
Mult = ones(size(vector));
Mult(vector < 200) = C2; % The largest limit at first!
Mult(vector < 100) = C1;
result = vector .* Mult;
  2 commentaires
Jan
Jan le 3 Nov 2011
There have been some other good solutions which perform the distribution to the different intervals automatically. Unfortunately they have been deleted.
The 2nd output of HISTC could be useful also.
Andrei Bobrov
Andrei Bobrov le 3 Nov 2011
vector=randi([1 100],38,1);
[~,b] = histc(vector,0:100:1000);
C = randi(125,10,1);
result = C(b).*vector;

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