//矩阵类
class Matrix {//将一个数组构建成一个矩阵，行Row、列Column
    constructor(data,Row,Column){this.data=data||[];this.Row=Row;//行this.Column=Column;//竖
    }//根据行、列返回矩阵元素
    getItem(r,c){return this.data[r*this.Column+c]||0;}//根据行、列设置矩阵元素
    setItem(r,c,item){this.data[r*this.Column+c]=item;}//换行
    swapRow(r1,r2){for(let c=0;c<this.Column;c++){const cache=this.getItem(r1,c)this.setItem(r1,c,this.getItem(r2,c))this.setItem(r2,c,cache);}}oneRowEach(r,callback){for(let c=0;c<this.Column;c++){callback(this.getItem(r,c),r,c)}}//按行遍历矩阵元素,返回元素item，行r，列c
    rowEach(callback){for(let r=0;r<this.Row;r++){for(let c=0;c<this.Column;c++){callback(this.getItem(r,c),r,c)}}}//按竖遍历矩阵元素,返回元素item，行r，列c
    columnEach(callback){for(let c=0;c<this.Column;c++){for(let r=0;r<this.Row;r++){callback(this.getItem(r,c),r,c)}}}//行循环
    oneRowMap(r,callback){this.oneRowEach(r,(item,r,c)=> {this.setItem(r,c,callback(item,r,c));})}//按行map矩阵元素
    rowMap(callback){this.rowEach((item,r,c)=> {this.setItem(r,c,callback(item,r,c));})}//相加
    add(matrix){if(matrix instanceof Matrix&& this.Row === matrix.Row && this.Column === matrix.Column){const nMatrix=new Matrix([],this.Row,this.Column)this.rowEach(function (item,r,c) {nMatrix.setItem(r,c,item+matrix.getItem(r,c))})return nMatrix;}else{throw '方法plus 参数错误';}}//相减
    sub(matrix){if(matrix instanceof Matrix&& this.Row === matrix.Row && this.Column === matrix.Column){const nMatrix=new Matrix([],this.Row,this.Column)this.rowEach(function (item,r,c) {nMatrix.setItem(r,c,item-matrix.getItem(r,c))})return nMatrix;}else{throw '方法minus 参数错误';}}//相乘
    multiply(obj){if(obj instanceof Matrix){return this.multiplyMatrix(obj)}else if(typeof obj=='number'){return this.multiplyNumber(obj)}else{throw 'multiply 输入的参数类型错误';}}//矩阵与数相乘,返回一个新的矩阵
    multiplyNumber(number){const nMatrix=new Matrix([],this.Row,this.Column)this.rowEach((item,r,c)=> {nMatrix.setItem(r,c,item*number)})return nMatrix;}//矩阵与矩阵相乘 矩阵A的行必须与矩阵B的列数相等
    multiplyMatrix(matrix){if(this.Row!==matrix.Column){throw '矩阵A的行必须与矩阵B的列数相等';}const nMatrix=new Matrix([],this.Row,matrix.Column)for(let r=0;r<this.Row;r++){for(let mc=0;mc){let num=0;for(let c=0;c<this.Column;c++){num=num+this.getItem(r,c)*matrix.getItem(c,mc)}nMatrix.setItem(r,mc,num)}}return nMatrix;}//转换成字符图形
    toString(){let str='[';for(let r=0;r<this.Row;r++){str=str+'\n'for(let c=0;c<this.Column;c++){if(r==this.Row-1&&c==this.Column-1){str=str+this.getItem(r,c);}else{str=str+this.getItem(r,c)+',';}}}str=str+'\n]'return str;}
}
module.exports=Matrix;
// //demo
// const m=new Matrix([1,2,3,4,5,6],3,2);
// const m2=new Matrix([1,2,3,4,5,6],2,3);
// console.log('按行遍历矩阵元素,返回元素item，行r，列c')
// m.rowEach(function (item,r,c) {
//     console.log(item,r,c)
// })
// console.log('按竖遍历矩阵元素,返回元素item，行r，列c')
// m.columnEach(function (item,r,c) {
//     console.log(item,r,c)
// })
//
// console.log('输出矩阵图形');
// console.log(m.toString())
// console.log(m2.toString())
//
// console.log('矩阵与数相乘');
// const m4=m.multiply(3)
// console.log(m4.toString())
//
// console.log('矩阵与矩阵相乘');
// const m3=m.multiply(m2)
// console.log(m3.toString())
//