FCM代码java FCM代码

JAVA程序设计阅读程序写出运行结果

第一问

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Hello,This is a fruit!

Hello,The is an apple!

因为子类构造方法中

Apple() {

System.out.println("Hello,The is an apple!");

}

在没有特定声明时等价于

Apple() {

super();//这里将执行父类的构造方法

System.out.println("Hello,The is an apple!");

}

第二问题

执行结果是

gender is wrong

try{

System.out.println("T0");// 1这里始终会执行，一进到try就执行

if(!flag1||!flag2)

throw new GenderException();// 2、这里判断得到，当两个都为false时抛出异常，但没有打印信息

System.out.println("T1");

}catch(GenderException e){

System.out.println("gender is wrong");//3，步骤2抛出的异常在这里被截取，所以打印出来

}catch(Exception){

System.out.println("T2");

}finally{

System.out.println("T3");//4，try catch下 finally始终会执行，也打印

}

System.out.println("T4");// 5、try catch 外，继续执行

}

matlab中的功能函数FCM如何使用

模糊C均值聚类算法，可将输入的数据集data聚为指定的cluster_n类

【函数描述】

语法格式

[center, U, obj_fcn] = FCM(data, cluster_n, options)

用法：

1. [center,U,obj_fcn] = FCM(Data,N_cluster,options);

2. [center,U,obj_fcn] = FCM(Data,N_cluster);

输入变量

data ---- n*m矩阵,表示n个样本,每个样本具有m维特征值

cluster_n ---- 标量,表示聚合中心数目,即类别数

options ---- 4*1列向量，其中

options(1): 隶属度矩阵U的指数，1(缺省值: 2.0)

options(2): 最大迭代次数(缺省值: 100)

options(3): 隶属度最小变化量,迭代终止条件(缺省值: 1e-5)

options(4): 每次迭代是否输出信息标志(缺省值: 0)

输出变量

center ---- 聚类中心

U ---- 隶属度矩阵

obj_fcn ---- 目标函数值

python 中如何调用FCM算法

以下代码调试通过：

1234567class LuciaClass: # 定义类 def luciaprint(self, text): # 类里面的方法 print('\n', text) # 方法就是输出 text x = LuciaClass() # 方法的实例 xx.luciaprint('today is a bad day ~~~') # 实例调用类方法

运行效果：

java一个整数除以一个小数为什么的到小数

Java中如果除运算符“/”，在不加任何限制的情况下，两个整数相除，得到的是整数，小数点后的被舍弃。但是有些场景下我们需要拿到除得的小数，还要指定位数的小数。这时候有以下处理方法：

1.使用DecimalFormat来限定得到的小数位数

int pcm = 98;

int fcm = 11;

DecimalFormat df = new DecimalFormat("0.00");

double tmpVal = Double.parseDouble(df.format((double) pcm/(pcm+fcm)));

//get value 0.89

注意，它默认返回的是String，如果需要double/float要做一下转换。

2.直接使用Decimal运算

@Test

public void testDecimalOper(){

int pcm = 94;

int fcm = 11;

BigDecimal pcmbd = new BigDecimal(pcm);

BigDecimal fcmbd = new BigDecimal(fcm);

BigDecimal rate = new BigDecimal(0.00);

rate = pcmbd.divide(pcmbd.add(fcmbd), 2, RoundingMode.HALF_UP);

System.out.println(rate);//0.90

}

float/double在工程运算中使用的比较多，在商业计算中使用Decimal类型的比较多。(注：

在《Effective Java》这本书中也提到这个原则，float和double只能用来做科学计算或者是工程计算，在商业计算中我们要用 java.math.BigDecimal，另外，我们如果需要精确计算，要用String来够造BigDecimal。在《Effective Java》一书中的例子是用String来够造BigDecimal的。(注意：divide方法中推荐使用枚举RoundingMode.HALF_UP)

)

两种方式都可以。推荐使用第二种方式来处理精度和round mode的设置。

附BigDecimal rouding mode:

/**

* Rounding mode to round away from zero. Always increments the

* digit prior to a nonzero discarded fraction. Note that this rounding

* mode never decreases the magnitude of the calculated value.

public final static int ROUND_UP = 0;

/**

* Rounding mode to round towards zero. Never increments the digit

* prior to a discarded fraction (i.e., truncates). Note that this

* rounding mode never increases the magnitude of the calculated value.

public final static int ROUND_DOWN = 1;

/**

* Rounding mode to round towards positive infinity. If the

* {@code BigDecimal} is positive, behaves as for

* {@code ROUND_UP}; if negative, behaves as for

* {@code ROUND_DOWN}. Note that this rounding mode never

* decreases the calculated value.

public final static int ROUND_CEILING = 2;

/**

* Rounding mode to round towards negative infinity. If the

* {@code BigDecimal} is positive, behave as for

* {@code ROUND_DOWN}; if negative, behave as for

* {@code ROUND_UP}. Note that this rounding mode never

* increases the calculated value.

public final static int ROUND_FLOOR = 3;

/**

* Rounding mode to round towards {@literal "nearest neighbor"}

* unless both neighbors are equidistant, in which case round up.

* Behaves as for {@code ROUND_UP} if the discarded fraction is

* ≥ 0.5; otherwise, behaves as for {@code ROUND_DOWN}. Note

* that this is the rounding mode that most of us were taught in

* grade school.

public final static int ROUND_HALF_UP = 4;

/**

* Rounding mode to round towards {@literal "nearest neighbor"}

* unless both neighbors are equidistant, in which case round

* down. Behaves as for {@code ROUND_UP} if the discarded

* fraction is {@literal } 0.5; otherwise, behaves as for

* {@code ROUND_DOWN}.

public final static int ROUND_HALF_DOWN = 5;

/**

* Rounding mode to round towards the {@literal "nearest neighbor"}

* unless both neighbors are equidistant, in which case, round

* towards the even neighbor. Behaves as for

* {@code ROUND_HALF_UP} if the digit to the left of the

* discarded fraction is odd; behaves as for

* {@code ROUND_HALF_DOWN} if it's even. Note that this is the

* rounding mode that minimizes cumulative error when applied

* repeatedly over a sequence of calculations.

public final static int ROUND_HALF_EVEN = 6;

/**

* Rounding mode to assert that the requested operation has an exact

* result, hence no rounding is necessary. If this rounding mode is

* specified on an operation that yields an inexact result, an

* {@code ArithmeticException} is thrown.

public final static int ROUND_UNNECESSARY = 7;

谁有模糊c均值聚类算法的代码？

模糊c均值聚类

函数： fcm

格式： [center,U,obj_fcn] = fcm(data,cluster_n)

举例如下所示：

data = rand(100, 2);

[center,U,obj_fcn] = fcm(data, 2);

plot(data(:,1), data(:,2),'o');

maxU = max(U);

index1 = find(U(1,:) == maxU);

index2 = find(U(2, :) == maxU);

line(data(index1,1), data(index1, 2), 'linestyle', 'none', 'marker', '*', 'color', 'g');

line(data(index2,1), data(index2, 2), 'linestyle', 'none', 'marker', '*', 'color', 'r');

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