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POhow to count correctly number of matching pairs in two vector
 

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  1. POhow to count correctly number of matching pairs in two vector
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    <p>please let us consider this code</p> <pre><code>function averageentropy=calculate(f,y) count1=0; count0=0; n=length(f); n1=0; n0=0; entrop1=0; entrop2=0; bigp=sum(f)/n; indf1 = f == 1; indf0 = ~indf1 ; indy1 = y == 1; indy0 = ~indy1 ; count1 = sum(indf1 &amp; indy1) ; count0 = sum(indf0 &amp; indy0) ; n1 = sum(indf1); n0 = sum(indf0); smallpplus=count1/n1; smallpminus=count0/n0; if smallpplus==0 || (1-smallpplus==0) entrop1=0; else entrop1=-smallpplus*log2(smallpplus)-(1- smallpplus)*log2(1- smallpplus); end if smallpminus==0 || (1-smallpminus==0) entrop2=0; else entrop2=-smallpminus*log2(smallpminus)-(1- smallpminus)*log2(1- smallpminus); end averageentropy=bigp*entrop1+(1-bigp)*entrop2; end </code></pre> <p>and i want following thing,first of all consider following data for f2 and y</p> <pre><code>f2 0 0 0 1 1 1 0 1 </code></pre> <p>and </p> <pre><code>y 1 1 1 0 0 0 0 0 </code></pre> <p>and i want to calculate following steps </p> <p>1.calculate bigp which is equal number of 1 in f2 divided by length of f2,this code does well this part</p> <ol> <li>i want to count number of 1 in y where f2=1</li> </ol> <p>2.1 i defined small p plus as this number divided by number of 1 in f2</p> <p>3.i want to count number of 1 in y where f2=0</p> <p>3.1 i defined small p minus as this number divided total number of f2=0</p> <p>and finaly i want to calculate average entropy,formula is indicated in code</p> <p>what is should get is 0.47,but i am getting 0.4,pl;ease help me to fix this</p> <p>UPDATED i think this line should be error</p> <pre><code>count1 = sum(indf1 &amp; indy1) ; count0 = sum(indf0 &amp; indy1) ; </code></pre> <p>more precisely</p> <pre><code>count0 = sum(indf0 &amp; indy1) count0 = 3 </code></pre> <p>there is error,there must be 3/8=0.375</p>
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    1. USdato datuashvili
    1. USdato datuashvili
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    1. COPrint intermediate results to find one that doesn't match your expectations. Your problem should be just one line. Don't make us look for the needle in the haystack - that is your task.
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      1. USFloris
    2. COi have updated wher ein my mind there should be mistake
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      1. USdato datuashvili
    3. COJust give a sample of input and output data. Your code shows your attempt but it doesn't make us understand the problem
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      1. POhow to count correctly number of matching pairs in two vector
      1. USParag S. Chandakkar
 

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