Why changing a specific element in a vector matrix makes the unchanged elements zero?!

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hadi
hadi 2018-10-11
评论： hadi 2018-10-12
I have the following code, where there are two rows, the first one has a set of values, the second one is a sorted version of it. Now, if there are multiple equal values in the first row, I want to change all of these values except the first one by adding a random number to these values in the first row and their corresponding values in the second row. The problem is that if a repetition happens and the program adds these random numbers, it changes all the unique values to zero.
Any help is appreciated. Thank you very much.
if true
clc
clear all
close all
c=4;
ObFunVal =1.0e-11*[0.8582 0.8582 0.8582 0.9163];
ObFunVal_Ascending =1.0e-11*[0.8582 0.8582 0.8582 0.9163];
for j=1:c
ch=find(ObFunVal==ObFunVal_Ascending(c-j+1));
ch_Length=numel(ch);
if(ch_Length>1)
for i=2:ch_Length
RandomNum=rand;
ObFunVal(ch(i))=ObFunVal(ch(i))+RandomNum;
ObFunVal_Ascending(c-j+2-i)=ObFunVal_Ascending(c-j+2-i)+RandomNum;
end
end
end
ObFunVal
ObFunVal_Ascending
end

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Rik
Rik 2018-10-11
It doesn't change the values to 0. You are adding values with rand without considering the magnitude of the rest of the values in the vector. You can easily see this if you display ObFunVal(1). RandomNum=rand*1.0e-12; would solve your issue.
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