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Could somebody please help me to create an array of array.I have a matrix calculator and I want to create an array of arrays ('smaller').How can I do it?The functiions create2Darray and calculateDet are working ok,so now problem with them.Would be really grateful for the help.I need an array of these arrays (main matrix's minors) to calculate their determinants and calculate the inverted matrix Here is the HTML:

<div id = "table4">
<div class = "calcHeader">Macierz odwrotna [3x3]</div>
<form id = "row1"><!--first row-->
    <input type = "text" class = "det3"/>
    <input type = "text" class = "det3"/>
    <input type = "text" class = "det3"/>
 </form>
 <form id = "row2"><!--second row-->
    <input type = "text" class = "det3"/>
    <input type = "text" class = "det3"/>
    <input type = "text" class = "det3"/>
</form>
<form id = "row3"><!--third row-->
    <input type = "text" class = "det3"/>
    <input type = "text" class = "det3"/>
    <input type = "text" class = "det3"/>
</form>
<div class = "count" onclick="invertMat('det3')"><a href = "#">Wylicz</a></div>
</div>

Javascript

function invertMat(matrixClass) {
    var matrix = create2Darray(matrixClass);
    var det = calculateDet(matrix);
    //alert(det);
    var invMat = new Array();
    for (var i = 0; i < matrix.length; i++) {
        invMat[i] = new Array();
        for (var j = 0; j < matrix.length; j++) {
            invMat[i][j] = 0;
        }
    }
    if (matrix.length == 2) {
        invMat[0][0] = 1 / det * matrix[1][1];
        invMat[1][0] = 1 / det * (-matrix[1][0]);
        invMat[0][1] = 1 / det * (-matrix[0][1]);
        invMat[1][1] = 1 / det * matrix[0][0];
        alert(invMat);
    } else if (matrix.length == 3) {
        //var smaller = new Array();//creating an empty array for a matrix minor
        for (var i = 0; i < matrix.length; i++) {
            var smaller = new Array(matrix.length - 1);
            for (h = 0; h < smaller.length; h++) {
                smaller[h] = new Array(matrix.length - 1);
            }
            for (a = 1; a < matrix.length; a++) {
                for (b = 0; b < matrix.length; b++) {
                    if (b < i) {
                        smaller[a - 1][b] = matrix[a][b];
                    } else if (b > i) {
                        smaller[a - 1][b - 1] = matrix[a][b];
                    }
                }
            }
        }
    }
}
4

2 回答 2

2

试试这个小提琴

var array1 = new Array();

array1.push(1);
array1.push(2);


var array2 = new Array();

array2.push(3);
array2.push(4);

var array3 = new Array();
array3.push(array1);
array3.push(array2);

console.log(array3[0]);
console.log(array3[1]);
于 2013-05-22T14:36:21.850 回答
2

现场演示

function create2Array(d1, d2, fn) {
    var arr = [],
        d = function(x, y) {},
        f = fn || d;
    for (var i = 0; i < d1; i++) {
        for (var j = 0, curr = []; j < d2; j++) {
             curr[j] = f.call(window, i, j); 
        };
        arr[i] = curr;
    };
    return arr;
};


function print2DArray(arr) {
    document.body.innerHTML += "<p><b>Array:</b></p>";
    for (var i = 0, len = arr.length; i< len; i++) {
        document.body.innerHTML += "<p><b>" + i + "</b>: " + arr[i].join(" ") + "</p>";
    };
};

var matrix = create2Array(10, 10, function(x, y) { return 0;}),
    m2 = create2Array(10, 10, function(x, y) { return x + y;});
print2DArray(matrix);
print2DArray(m2);

像这样使用它：

var matrix = create2Array(10, 10);

或者您甚至可以指定一个将索引作为参数的自定义初始化函数。假设你想用 0 默认初始化你的矩阵：

var matrix = create2Array(10, 10, function(x, y) { return 0;});
于 2013-05-22T14:36:49.647 回答