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 don't 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)

{
}

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;
}```

Last edited by SaswatPadhi; 19Jun2009 at 18:11.. Reason: Removed unncessary 'newlines'.