小编Hun*_*yen的帖子

using System;

public class Newton_Ralphson
{
    public double compute(double x,int n,double[] P)            // x, degree, coefficients 
    {
        double pol = 0;
        for (int i = 0;i < n;i++)
        {
            for (int j = 1; j < n - i; j++)
                x *= x;
                pol += P[n - i] * x;
        }
        pol += P[0];
        return pol;
    }

public double[] secondary_Pol(int n, double[] P)            //slope
{
    double[] secP = new double[n - 1];
    for (int i = 0; i < n …

我看过其他帖子，但似乎没有一个解决方案适合我的问题。错误出在方法上FirebaseRef.setValue()

我正在尝试将数据保存到Firebase server. 起初我认为错误是因为我尝试将数据保存为自定义对象，然后我尝试将其保存为基本哈希（我按照此链接中的教程进行操作）

protected Boolean doInBackground(Void... params) {\n            // Database Connection, if no connection or what not, exception will be here\n            mDatabase = FirebaseDatabase.getInstance().getReference();\n            Log.d(DBTAG, mDatabase.toString());\n\n            // \'child database\'\n            mBooksDatabase = mDatabase.child("books");\n            mCurrentUser = mDatabase.child("users").child(mUserEmail);\n\n            // address to upload the book, later we can call newBookRef.getKey() to get the ID\n            // and use the ID to indicate the relationship between the owner and the book\n            final DatabaseReference newBookRef = mBooksDatabase.push();\n            try {\n …