unit1.cpp

C++builder编写的遗传算法程序

        {
            if(tmp&mask)
            {
               str1=str1+"1";
            }
            else
            {
               str1=str1+"0";
            }
            tmp = tmp>>1;
        }
        Form1->ListBox1->Items->Add(str1);
    }
}
////////////////////////////////////////////////////////////////////////
void __fastcall TForm1::preselect()
{
    int j;
    sumfitness = 0;
    for(j = 0; j < popsize; j++)
       sumfitness += oldpop[j].fitness;
}
//////////////////////////////////////////////////////////////////////////////////
int __fastcall TForm1::select()   /* 轮盘赌选择*/
{
    float sum, pick;
    int i;
    pick = randomperc();
    sum = 0;
    if(sumfitness != 0)
    {
        for(i = 0; (sum < pick) && (i < popsize); i++)
            sum += oldpop[i].fitness/sumfitness;
    }
    else
        i = rnd(1,popsize);
    return(i-1);
}
//------------------------------------------------------------------------------
void __fastcall TForm1::statistics(struct individual *pop)  /*计算种群统计数据 */
{
    int i, j;
    sumfitness = 0.0;
    min = pop[0].fitness;
    max = pop[0].fitness;
    /* 计算最大、最小和累计适应度 */
    for(j = 0; j < popsize; j++)
    {
        sumfitness = sumfitness + pop[j].fitness;
        if(pop[j].fitness > max) max = pop[j].fitness;        
        if(pop[j].fitness < min) min = pop[j].fitness;         
        /* new global best-fit individual */
        if(pop[j].fitness > bestfit.fitness)
	  {
	   for(i = 0; i < chromsize; i++)
	    bestfit.chrom[i]      = pop[j].chrom[i];
            bestfit.fitness    = pop[j].fitness;
            bestfit.varible   = pop[j].varible;
            bestfit.generation = gen;
	  }
      }
    /* 计算平均适应度 */
    avg = sumfitness/popsize;
}
//--------------------------------------------------------
void __fastcall TForm1::title()
{
  Form1->ListBox1->Items->Add("                  SGA Optimizer                 ");
  Form1->ListBox1->Items->Add("-------------------------------------------------- ");
}
//---------------------------------------------------------
//----------------------------------------------------------------------
void __fastcall TForm1::objfunc(struct individual *critter) /* 计算适应度函数值 */
{
    unsigned mask=1;
    unsigned bitpos;
    unsigned tp;
    double bitpow ;
    int j, k, stop;
    critter->varible = 0.0;
    for(k = 0; k < chromsize; k++)
    {
        if(k == (chromsize-1))
            stop = lchrom-(k*(8*sizeof(unsigned)));
        else
            stop =8*sizeof(unsigned);
        tp = critter->chrom[k];
        for(j = 0; j < stop; j++)
        {
            bitpos = j + (8*sizeof(unsigned))*k;
            if((tp&mask) == 1)
            {
                bitpow = pow(2.0,(double) bitpos);
                critter->varible = critter->varible + bitpow;
            }
            tp = tp>>1;
        }
    }
    critter->varible =-1+critter->varible*3/(pow(2.0,(double)lchrom)-1);
    critter->fitness =critter->varible*sin(critter->varible*10*atan(1)*4)+2.0;
}
//-------------------------------------------------------------------------------
void __fastcall TForm1::mutation(unsigned *child)   /*变异操作*/
{
    int j, k, stop;
    unsigned mask, temp = 1;
    for(k = 0; k < chromsize; k++)
    {
        mask = 0;
        if(k == (chromsize-1))
            stop = lchrom - (k*(8*sizeof(unsigned)));
        else
            stop = 8*sizeof(unsigned);
        for(j = 0; j < stop; j++)
        {
            if(flip(pmutation))
            {
                mask = mask|(temp<<j);
                nmutation++;
            }
        }
        child[k] = child[k]^mask;
    }
}
//////////////////////////////////////////////////////////////////////////////
int __fastcall TForm1::crossover (unsigned *parent1, unsigned *parent2, unsigned *child1, unsigned *child2)
{/* 由两个父个体交叉产生两个子个体 */
    int j, jcross, k;
    unsigned mask, temp;
    if(flip(pcross))
    {
        jcross = rnd(1 ,(lchrom - 1));/* Cross between 1 and l-1 */
        ncross++;
        for(k = 1; k <= chromsize; k++)
        {
            if(jcross >= (signed)(k*(8*sizeof(unsigned))))
            {
                child1[k-1] = parent1[k-1];
                child2[k-1] = parent2[k-1];
            }
            else if((jcross <(signed) (k*(8*sizeof(unsigned)))) && (jcross > (signed)((k-1)*(8*sizeof(unsigned)))))
            {
                mask = 1;
                for(j = 1; j <= (signed)(jcross-1-((k-1)*(8*sizeof(unsigned)))); j++)
                {
                    temp = 1;
                    mask = mask<<1;
                    mask = mask|temp;
                }
                child1[k-1] = (parent1[k-1]&mask)|(parent2[k-1]&(~mask));
                child2[k-1] = (parent1[k-1]&(~mask))|(parent2[k-1]&mask);
            }
            else
            {
                child1[k-1] = parent2[k-1];
                child2[k-1] = parent1[k-1];
            }
        }
    }
    else
    {
        for(k = 0; k < chromsize; k++)
        {
            child1[k] = parent1[k];
            child2[k] = parent2[k];
        }
        jcross = 0;
    }
    return(jcross);
}
//------------------------------------------------------------------------------
void __fastcall TForm1::advance_random()          /* 产生55个随机数 */
{
    int j1;
    double new_random;
    for(j1 = 0; j1 < 24; j1++)
    {
        new_random = oldrand[j1] - oldrand[j1+31];
        if(new_random < 0.0) new_random = new_random + 1.0;
        oldrand[j1] = new_random;
    }
    for(j1 = 24; j1 < 55; j1++)
    {
        new_random = oldrand [j1] - oldrand [j1-24];
        if(new_random < 0.0) new_random = new_random + 1.0;
        oldrand[j1] = new_random;
    }
}
//------------------------------------------------------------------------------
int __fastcall TForm1::flip(float prob)          /* 以一定概率产生0或1 */
{
    if(randomperc() <= prob)
        return(1);
    else
        return(0);
}
//-------------------------------------------------------------------------
void __fastcall TForm1::randomize()            /* 设定随机数种子并初始化随机数发生器 */
{
    float randomseed;
    int j1;
    for(j1=0; j1<=54; j1++)
      oldrand[j1] = 0.0;
    jrand=0;
    randomseed=0.5;
    warmup_random(randomseed);
}
//--------------------------------------------------------------------------
double __fastcall TForm1::randomnormaldeviate()         /* 产生随机标准差 */
{
    double at;
    double t, rndx1;
    if(rndcalcflag)
    {   rndx1 = sqrt(- 2.0*log((double) randomperc()));
        t = 6.2831853072 * (double) randomperc();
        rndx2 = rndx1 * sin(t);
        rndcalcflag = 0;
        at =  rndx1 * cos(t);
        return(at);
    }
    else
    {
        rndcalcflag = 1;
        return(rndx2);
    }
}
//----------------------------------------------------------------------------
float __fastcall TForm1::randomperc()    /*与库函数random()作用相同, 产生[0,1]之间一个随机数 */
{
    jrand++;
    if(jrand >= 55)
    {
        jrand = 1;
        advance_random();
    }
    return((float) oldrand[jrand]);
}
//----------------------------------------------------------------------------
int __fastcall TForm1::rnd(int low,int high) /*在整数low和high之间产生一个随机整数*/

{
    int i;
    if(low >= high)
        i = low;
    else
    {
        i = (randomperc() * (high - low + 1)) + low;
        if(i > high) i = high;
    }
    return(i);
}
//---------------------------------------------------------------------------------
void __fastcall TForm1::warmup_random(float random_seed)   /* 初始化随机数发生器*/
{
    int j1, ii;
    double new_random, prev_random;

    oldrand[54] = random_seed;
    new_random = 0.000000001;
    prev_random = random_seed;
    for(j1 = 1 ; j1 <= 54; j1++)
    {
        ii = (21*j1)%54;
        oldrand[ii] = new_random;
        new_random = prev_random-new_random;
        if(new_random<0.0) new_random = new_random + 1.0;
        prev_random = oldrand[ii];
    }
    advance_random();
    advance_random();
    advance_random();
    jrand = 0;
}
//-------------------------