fcm算法java代码 fcm算法流程图
python 中如何调用FCM算法
以下代码调试通过：
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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：
在matlab中做模糊C均值聚类（fcm）算法如何体现初始隶属度？
我贴部分FCM的Matlab代码：
expo = options(1); % Exponent for U
max_iter = options(2); % Max. iteration
min_impro = options(3); % Min. improvement
display = options(4); % Display info or not
obj_fcn = zeros(max_iter, 1); % Array for objective function
U = initfcm(cluster_n, data_n); % Initial fuzzy partition
% Main loop
for i = 1:max_iter,
[U, center, obj_fcn(i)] = stepfcm(data, U, cluster_n, expo);
if display,
fprintf('Iteration count = %d, obj. fcn = %f\n', i, obj_fcn(i));
end
% check termination condition
if i 1,
if abs(obj_fcn(i) - obj_fcn(i-1)) min_impro, break; end,
end
end
其中
U = initfcm(cluster_n, data_n); % Initial fuzzy partition
这个就是初始化划分矩阵，随机产生一个隶属度矩阵，
代码如下：
U = rand(cluster_n, data_n);
col_sum = sum(U);
U = U./col_sum(ones(cluster_n, 1), :);
上面就是它初始化的一个隶属度矩阵，
cluster_n行，data_n列。
即一列中从上到下表示每个样本隶属与每一类的隶属度。
然后在算法中不断迭代，
最后得到的还是如此大的一个矩阵，代表每个样本隶属与每一类的隶属度
然后选择最大的那个就是，它就属于那一类。
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
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;
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