如果在matlab中出现Undefined function 'initializega' for input arguments of type 'double'怎么解决

楼主是不是参考的别人的程序，initializega这个子函数在你的电脑中并不存在

可能是matlab版本问题，matlab7以上的版本中没有initializega函数了，全都集合到gaoptimset函数中。

旧版本中的initializega函数：

function [pop] = initializega(num, bounds, evalFN,evalOps,options)

% function [pop]=initializega(populationSize, variableBounds,evalFN,

% evalOps,options)

% initializega creates a matrix of random numbers with

% a number of rows equal to the populationSize and a number

% columns equal to the number of rows in bounds plus 1 for

% the f(x) value which is found by applying the evalFN

% This is used by the ga to create the population if it

% is not supplied

%

% pop - the initial, evaluated, random population

% populatoinSize - the size of the population, ie the number to create

% variableBounds - a matrix which contains the bounds of each variable, ie

% [var1_high var1_low; var2_high var2_low; ]

% evalFN - the evaluation fn, usually the name of the m file for

% evaluation

% evalOps - any options to be passed to the eval function defaults []

% options - options to the initialize function, ie

% [type prec] where eps is the epsilon value

% and the second option is 1 for float and 0 for binary,

% prec is the precision of the variables defaults [1e-6 1]

% Binary and Real-Valued Simulation Evolution for Matlab GAOT V2

% Copyright (C) 1998 CR Houck, JA Joines, MG Kay

%

% CR Houck, JJoines, and MKay A genetic algorithm for function

% optimization: A Matlab implementation ACM Transactions on Mathmatical

%

% This program is free software; you can redistribute it and/or modify

% it under the terms of the GNU General Public License as published by

% the Free Software Foundation; either version 1, or (at your option)

% any later version

%

% This program is distributed in the hope that it will be useful,

% but WITHOUT ANY WARRANTY; without even the implied warranty of

% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE See the

% GNU General Public License for more details A copy of the GNU

% General Public License can be obtained from the

% Free Software Foundation, Inc, 675 Mass Ave, Cambridge, MA 02139, USA

if nargin<5

options=[1e-6 1];

end

if nargin<4

evalOps=[];

end

if any(evalFN<48) %Not a m file

if options(2)==1 %Float GA

estr=['x=pop(i,1); pop(i,xZomeLength)=', evalFN ';'];

else %Binary GA

estr=['x=b2f(pop(i,:),bounds,bits); pop(i,xZomeLength)=', evalFN ';'];

end

else %A m file

if options(2)==1 %Float GA

estr=['[ pop(i,:) pop(i,xZomeLength)]=' evalFN '(pop(i,:),[0 evalOps]);'];

else %Binary GA

estr=['x=b2f(pop(i,:),bounds,bits);[x v]=' evalFN

'(x,[0 evalOps]); pop(i,:)=[f2b(x,bounds,bits) v];'];

end

end

numVars = size(bounds,1); %Number of variables

rng = (bounds(:,2)-bounds(:,1))'; %The variable ranges'

if options(2)==1 %Float GA

xZomeLength = numVars+1; %Length of string is numVar + fit

pop = zeros(num,xZomeLength); %Allocate the new population

pop(:,1:numVars)=(ones(num,1)rng)(rand(num,numVars))+

(ones(num,1)bounds(:,1)');

else %Binary GA

bits=calcbits(bounds,options(1));

xZomeLength = sum(bits)+1; %Length of string is numVar + fit

pop = round(rand(num,sum(bits)+1));

end

for i=1:num

eval(estr);

end

Systemoutprint("请输入折扣:");

zeko=scannernextDouble();

  zekoh=zekouqianzeko;

你之前只是将单个商品的账单打印出来了，但是没有将账单总值加在一起，因此zekouqian变量还是o，你需要在将代码顺序改一下

package text1;

import javautilScanner;

public class nidechao1 {

public static void main(String args[]){

double DTVqian=30;   //T恤单价

double Dpaiqian=248;  //网球拍单价

double Dxieqian=150;  //网球鞋单价

double STVqian=0;     //T恤总价

double Sxieqian=0;    //网球鞋总价

double Spaiqian=0;    //网球拍总价

int tvnum=0;     //T恤数量

int painum=0;   //网球拍数量

int xienum=0;   // 网球鞋数量

double zekouqian=0;// 折扣前总价

double zeko=00;   //折扣后总价

double  zekoh=0;   //折扣

double fk=0;      //付款

double zl=0;      //找零

Scanner scanner =new Scanner(Systemin);

Systemoutprintln("请输入购买T恤数量：");

tvnum = scannernextInt();

Systemoutprintln("请输入购买网球拍数量：");

   painum=scannernextInt();

Systemoutprintln("请输入购买网球鞋数量：");

xienum=scannernextInt();

STVqian=tvnumDTVqian;

Spaiqian=painumDpaiqian;

Sxieqian=xienumDxieqian;

zekouqian=STVqian+Spaiqian+Sxieqian;

       Systemoutprintln("消费单据");

Systemoutprintln("消费单");

Systemoutprintln("购买商品\t单价\t数量\t金额");

Systemoutprintln("T恤：\t"+DTVqian+"\t"+tvnum+"\t"+STVqian);

Systemoutprintln("网球拍：\t"+Dpaiqian+"\t"+painum+"\t"+Spaiqian);

Systemoutprintln("网球鞋：\t"+Dxieqian+"\t"+xienum+"\t"+Sxieqian);

Systemoutprint("请输入折扣:");

zeko=scannernextDouble();

  zekoh=zekouqianzeko;

Systemoutprintln("总金额："+ zekoh);

        Systemoutprintln("付款：");

fk=scannernextDouble();

       Systemoutprintln("找零："+(fk-zekoh));

}

}

#include "stdafxh"

#include "iostream"

#include "mathh"

using namespace std;

int _tmain(int argc, _TCHAR argv[])

{

double x = 11;

while(fabs(5xxx-3xx+2x-8)>0000001)

x = x - (5xxx-3xx+2x-8)/(15xx-6x+2);

cout<<"方程的解为"<<x<<endl;

system("pause");

return 0;

}

重点改动：

scanf("%lf,%lf",&x1,&x2);

#include <stdioh>

#include <mathh>

int main()

{ double calculate(double y1,double y2,double fy1,double fy2);

  double x1,x2,fx1,fx2;

  double a;

  printf("enter x1 & x2:");

  scanf("%lf,%lf",&x1,&x2);

  fx1=(((x1+3)x1-8)x1+12)x1-10;

  fx2=(((x2+3)x2-8)x2+12)x2-10;

  printf("%f %f %f %f\n",x1,x2,fx1,fx2);

  a=calculate(x1,x2,fx1,fx2);

  printf("x=%lf\n",a);

  return 0;

}

double calculate(double y1,double y2,double fy1,double fy2)

{ double fy0,y0;

  double a;

  y0=(y1+y2)/2;

  fy0=(((y0+3)y0-8)y0+12)y0-10;

  printf("%f ",y0);

  if(fabs(fy0)>=1e-10)

  { if ((fy0fy1)<0)

    { y2=y0;

      fy2=fy0;

    }

    else

    { y1=y0;

      fy1=fy0;

    }

    a=calculate(y1,y2,fy1,fy2);

  }

  else

  { a=y0;

    printf("%62f",a);

  }

  return(a);

}

1、直接用数转换到字符串的方法即可。sprintf(s,"%lf",a);s是字符数组，a是double。这样就把a写到s中了。

2、例程：

#include<stdioh>

#include<iostream>

using namespace std;

int main()

{

char s[12];

double a=123456789876;

sprintf(s,"%lf",a);

printf("%s",s);

return 0;

}

1、在打开的ie浏览器窗口右上方点击齿轮图标，选择“Internet选项”，如下图所示：

2、在打开的Internet选项窗口中，切换到安全栏，在安全选卡中点击“自定义级别”，如下图所示：

3、在“安全设置-Internet 区域”界面找到“Java 小程序脚本”、“活动脚本”，并将这两个选项都选择为“禁用”，然后点击确定,如下图所示：

// 根据直线方程的一般式Ax+By+C=0,点到直线的距离公式:d=(Ax0+By0+C)/sqrt(AA+BB)推断出垂足的计算公式

double da = y3-y2;

double db = x2-x3;

double dc = x3y2-x2y3;

dx = ( dbdbx1 - dadby1 - dadc ) / ( dada + dbdb );

dy = ( -dadbx1 + daday1 - dbdc ) / ( dada + dbdb );

double ea = y3-y1;

double eb = x1-x3;

double ec = x3y1-x1y3;

ex = ( ebebx2 - eaeby2 - eaec ) / ( eaea + ebeb );

ey = ( -eaebx2 + eaeay2 - ebec ) / ( eaea + ebeb );

double fa = y1-y2;

double fb = x2-x1;

double fc = x1y2-x2y1;

fx = ( fbfbx3 - fafby3 - fafc ) / ( fafa + fbfb );

fy = ( -fafbx3 + fafay3 - fbfc ) / ( fafa + fbfb );

cout << "顶点A至BC边的垂足D(" << dx << "," << dy << "),AD = " << AD << endl;

cout << "顶点B至AC边的垂足E(" << ex << "," << ey << "),BE = " << BE << endl;

cout << "顶点C至AB边的垂足F(" << fx << "," << fy << "),CF = " << CF << endl;