Thread: Calculating Entropy of a file and coding it using Hamming

Hello there!

I am trying to solve a problem for a project i took and i am in the final

part of it...(view below for my until now code)

Well the aim is to calculate the entropy of a file and then to use

Hamming to code it. I managed to make both parts based on what I learned

from the class and read in the book. (Please if you are familiar with the

object tell me if it is correct )

So, my problem is that I am not able to merge those two parts below (you

dont need to read the theory for it).. like finding the entropy and then

continue for the coding of that file.

Any help, advice, anything is appreciate.
Thank you!

Entropy Calculation

Code:

#include "BufferedNode.h"
#include "Buffer.h"
#include "Vector.h"
#include <strstream>
#include <math.h>

#ifdef HAVE_VALUES_H
#include <values.h>
#endif

#ifdef HAVE_FLOAT_H
#include <float.h>
#endif

class Entropy;

DECLARE_NODE(Entropy)
/*Node
 *
 * @name Entropy
 * @category DSP:Misc
 * @description Calculates the entropy of a vector
 *
 * @input_name INPUT
 * @input_type Vector<float>
 * @input_description Input vector
 *
 * @output_name OUTPUT
 * @output_type Vector<float>
 * @output_description Entropy value (vector of 1)
 *
END*/


class Entropy : public BufferedNode {
   
   int inputID;
   int outputID;

public:
   Entropy(string nodeName, ParameterSet params)
      : BufferedNode(nodeName, params)

   {
      inputID = addInput("INPUT");
      outputID = addOutput("OUTPUT");
   }

   void calculate(int output_id, int count, Buffer &out)
   {
      ObjectRef inputValue = getInput(inputID, count);

      const Vector<float> &in = object_cast<Vector<float> > (inputValue);
      int inputLength = in.size();

      Vector<float> &output = *Vector<float>::alloc(1);
      out[count] = &output;

      float s2=0;
      float entr=0;
      for (int i=0;i<inputLength;i++)
      {
         s2+=in[i]*in[i];
      }
      s2 = 1/s2;

      for (int i=0;i<inputLength;i++)
      {
	 if (in[i] != 0)
	    entr -= s2*in[i]*in[i] * log(s2*in[i]*in[i]);
      }
      //cout << entr << endl;
      output[0] = entr;
   }

};

Hamming Coding

Code:

#include<iostream.h>  
#include<math.h>  
void hanming()  
{  
int i,n,k=2;  
int h[20];  
for(i=0;i<20;i++)h[i]=0;  
cout<<"bla bla"<<endl; cin="">>n;  
while(pow(2,k)<n+k+1)k++; cout=""><<"bla bla"<<endl; for(i="1;i<=n+k;i++){" if(i!="1&&i!=2&&i!=4&&i!=8)cin">>h[i];  
}  
h[1]=(h[3]+h[5]+h[7]+h[9]+h[11]+h[13]+h[15])%2;  
h[2]=(h[3]+h[6]+h[7]+h[10]+h[11]+h[14]+h[15])%2;  
h[4]=(h[5]+h[6]+h[7]+h[12]+h[13]+h[14]+h[15])%2;  
h[8]=(h[9]+h[10]+h[11]+h[12]+h[13]+h[14]+h[15])%2;  
for(i=1;i<=n+k;i++)cout<<h[i]; jiaoyan(int="" a[],int="" n)="" {="" i,p1,p2,p4,p8,m;="" int="" h[20];="" for(i="0;i<n;i++)h

[i+1]=a[i];" k="2;" p1="(h[1]+h[3])%2;" p2="(h[2]+h[3])%2;" m="2*p2+p1;" return="" m;="" }="" if(n="=3){">=5&&n<=7){  
// k=3;  
p1=(h[1]+h[3]+h[5]+h[7])%2;  
p2=(h[2]+h[3]+h[6]+h[7])%2;  
p4=(h[4]+h[5]+h[6]+h[7])%2;  
m=4*p4+2*p2+p1;  
return m;  
}  
if(n>=9&&n<=15){  
//k=4;  
p1=(h[1]+h[3]+h[5]+h[7]+h[9]+h[11]+h[13]+h[15])%2;  
p2=(h[2]+h[3]+h[6]+h[7]+h[10]+h[11]+h[14]+h[15])%2;  
p4=(h[4]+h[5]+h[6]+h[7]+h[12]+h[13]+h[14]+h[15])%2;  
p8=(h[8]+h[9]+h[10]+h[11]+h[12]+h[13]+h[14]+h[15])%2;  
m=8*p8+4*p4+2*p2+p1;  
return m;  
}  
else{  
cout<<"bla bla"<<endl; return="" -1;="" }="" ����="" void="" main()="" {="" hanming();="" coco;="" int="" i,n,m,h[20];=""

cout=""><<endl; cout=""><<"bla bla"<<endl; cin="">>n;  
cout<<"bla bla"<<endl; for(i="0;i<n;i++)cin">>h[i];  
m=jiaoyan(h,n);  
if(m==0)cout<<"bla bla"<<endl; if(m!="0)cout<<"bla bla"<<m;" cout=""><<endl; cin="">>coco;  
}

Hi there thank you for your answer.

What i got here is what i read from the book and staff...

However, how can i put these two in one project?
And what happens if I must migrate them ?

Originally Posted by kordellas

However, how can i put these two in one project?

Well what compiler are you using to compile your code? You need to help us in order for us to help you.

Originally Posted by kordellas

And what happens if I must migrate them ?

I'm not quite sure what you mean when you say "migrate", do you mean move them inbetween projects or something to that extent?

--
Legit

Originally Posted by legit

I'm not quite sure what you mean when you say "migrate", do you mean move them inbetween projects or something to that extent?

--
Legit

I mean to make those two in one...

I think he is trying to figure out how to implement that algorithm in his class.

Originally Posted by Kudose

I think he is trying to figure out how to implement that algorithm in his class.

To be honest, and i'm sorry if i'm overstepping the bounds here, but I don't think it's his/her code, they seem to know about classes, inheritance and container classes... and he/she doesn't know how to implement two files so they can work in coherence with eachother. Again, sorry if i'm overstepping, but that's just the way I pick it up.

--
Legit

It's cool. No one can seem to figure out what the OP wants and the OP can't express it well enough, so I figured I've give it a shot.

Originally Posted by brewbuck

The second piece of code differs vastly in style from the first. I'm sorry if I'm wrong, but I have serious doubts that you wrote either of these two pieces of code. Anybody who wrote the first piece of code would not be asking the question you are asking.

That's what I thought

--
Legit