新增判读方案

ym-common/src/main/java/com/cnbm/common/spc/math/Math.java

@@ -0,0 +1,101 @@
+package com.cnbm.common.spc.math;
+
+import java.math.RoundingMode;
+import java.text.DecimalFormat;
+
+public class Math {
+
+    public static void main(String[] args) {
+//        try(Scanner input = new Scanner(System.in);) {
+//            System.out.print("Enter ten numbers: ");
+//            double[] numbers = new double[10];
+//            for (int i = 0; i < numbers.length; i++)
+//                numbers[i] = input.nextDouble();
+//
+//            System.out.println("The mean is "+getMean(numbers)+
+//                    "\nThe stand deviation is "+getStandDeviation(numbers));
+//        }
+
+        //8.1 10.6 9.8 9.0 9.4 9.3 10.2 11.7
+        double[] d = new double[8];
+        d[0] = new Double(8.1) ;
+        d[1] = new Double(10.6);
+        d[2] = new Double(9.8);
+        d[3] = new Double(9.0);
+        d[4] = new Double(9.4);
+        d[5] = new Double(9.3);
+        d[6] = new Double(10.2);
+        d[7] = new Double(11.7);
+
+        ;
+        System.out.println("均值: "+getMean(d)+",,标准差："+StandardDiviation(d)+",极差："+range(d));
+    }
+
+    //平均值
+    public static double getMean(double...numbers) {
+        return format(getSum(numbers) / numbers.length);
+    }
+
+    //极差
+    public static double range(double[] in) {
+        if (in == null) {
+            throw new NumberFormatException();
+        }
+        double max = Double.MIN_VALUE;
+        double min = Double.MAX_VALUE;
+        for (int i = 0; i < in.length; i++) {
+            max = java.lang.Math.max(max, in[i]);
+            min = java.lang.Math.min(min, in[i]);
+        }
+        return format(max - min);
+        //return Mutil.subtract(max, min);
+    }
+
+    public static double format(double value) {
+        DecimalFormat df = new DecimalFormat("0.00");//创建一个df对象，传入0.00表示构造一个保留小数点后两位的df对象
+        df.setRoundingMode(RoundingMode.HALF_UP);//设置规则，这里采用的也是四舍五入规则
+        return Double.parseDouble(df.format(value));//返回value（在返回之前使用df对象的格式化方法将数据格式化）
+    }
+
+    //方差s^2=[(x1-x)^2 +...(xn-x)^2]/n 或者s^2=[(x1-x)^2 +...(xn-x)^2]/(n-1)
+    public static double Variance(double[] x) {
+        int m=x.length;
+        double sum=0;
+        for(int i=0;i<m;i++){//求和
+            sum+=x[i];
+        }
+        double dAve=sum/m;//求平均值
+        double dVar=0;
+        for(int i=0;i<m;i++){//求方差
+            dVar+=(x[i]-dAve)*(x[i]-dAve);
+        }
+        return format(dVar/m);
+    }
+
+    //标准差σ=sqrt(s^2)
+    public static double StandardDiviation(double[] x) {
+        int m=x.length;
+        double sum=0;
+        for(int i=0;i<m;i++){//求和
+            sum+=x[i];
+        }
+        double dAve=sum/m;//求平均值
+        double dVar=0;
+        for(int i=0;i<m;i++){//求方差
+            dVar+=(x[i]-dAve)*(x[i]-dAve);
+        }
+        return format(java.lang.Math.sqrt(dVar/(m-1)));
+        //return Math.sqrt(dVar/m);
+    }
+
+
+    //前n项和
+    public static double getSum(double...numbers) {
+        double sum = 0.0;
+
+        for (double i : numbers) {
+            sum += i;
+        }
+        return sum;
+    }
+}

ym-common/src/main/java/com/cnbm/common/spc/util/DataUtils.java

@@ -0,0 +1,67 @@
+package com.cnbm.common.spc.util;
+
+import java.text.SimpleDateFormat;
+import java.util.ArrayList;
+import java.util.Calendar;
+import java.util.Date;
+import java.util.List;
+
+/**
+ * @Desc: ""
+ * @Author: caixiang
+ * @DATE: 2022/7/12 14:23
+ */
+public class DataUtils {
+    public static void main(String[] args) {
+        ArrayList<Integer> arrs = new ArrayList<>();
+
+        for(int i=0;i<100;i++){
+            arrs.add(i);
+        }
+        List<List<Integer>> lists = fixedGroup(arrs, 10);
+        System.out.println();
+
+    }
+
+
+    public static Date getBeforeDate(Integer number){
+        Date date = new Date();//获取当前日期
+        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");//格式化一下
+        Calendar calendar1 = Calendar.getInstance();//获取对日期操作的类对象
+        //两种写法都可以获取到前三天的日期
+        // calendar1.set(Calendar.DAY_OF_YEAR,calendar1.get(Calendar.DAY_OF_YEAR) -3);
+        //在当前时间的基础上获取前三天的日期
+        calendar1.add(Calendar.DATE, 0-number);
+        //add方法 参数也可传入 月份，获取的是前几月或后几月的日期
+        //calendar1.add(Calendar.MONTH, -3);
+        Date day = calendar1.getTime();
+        return day;
+    }
+
+    /**
+     * 将一组数据固定分组，每组n个元素
+     *
+     * @param source 要分组的数据源
+     * @param limit      每组n个元素
+     * @param <T>
+     * @return
+     */
+    public static <T> List<List<T>> fixedGroup(List<T> source, int limit) {
+        if (null == source || source.size() == 0 || limit <= 0)
+            return null;
+        List<List<T>> result = new ArrayList<List<T>>();
+        int remainder = source.size() % limit;
+        int size = (source.size() / limit);
+        for (int i = 0; i < size; i++) {
+            List<T> subset = null;
+            subset = source.subList(i * limit, (i + 1) * limit);
+            result.add(subset);
+        }
+        if (remainder > 0) {
+            List<T> subset = null;
+            subset = source.subList(size * limit, size * limit + remainder);
+            result.add(subset);
+        }
+        return result;
+    }
+}