本文實(shí)例講述了JS實(shí)現(xiàn)簡單的二維矩陣乘積運(yùn)算方法。分享給大家供大家參考，具體如下：
Console控制臺(tái)截圖如下：
(上圖為輸出結(jié)果直接上代碼了(A矩陣可以乘以B矩陣的前提是A矩陣的列數(shù)等于B矩陣的行數(shù))
<!DOCTYPE html><html> <head> <title>demo</title> </head> <body> </body> <script type="text/javascript"> function log(msg) { console.log(msg); } /** * 可視化的打印出矩陣的數(shù)據(jù) */ function printMatrixData(data) { console.log(data); if(!data) { return; } var numberSize = 5; for(var i=0, len=data.length; i<len; i++) { var row = data[i]; var rowLog = "("; for(var j=0, jLen=row.length; j<jLen; j++) { rowLog += row[j]; // 補(bǔ)齊空格 rowLog += indent(numberSize - (row[j]+"").length); } rowLog+=")"; console.log(rowLog); } } /** * 拼接指定長度的空格 */ function indent(length) { var empty = ""; for(var i=0; i<length; i++) { empty += " "; } return empty; } /** * 矩陣原型 */ function Matrix(data) { // 這里必須傳一個(gè)二維數(shù)組，最好嚴(yán)格檢驗(yàn)一下 if(typeof data !== "object" || typeof data.length === "undefined" || !data) { throw new Error("data's type is error"); } this.data = data; this.cols = data.length; } var M = { findByLocation: function(data, xIndex, yIndex) { if(data && data[xIndex]) { return data[xIndex][yIndex]; } }, // 矩陣乘積 multiply: function(m, n) { if(!m instanceof Matrix && !n instanceof Matrix) { throw new Error("data's type is error"); } var mData = m.data; var nData = n.data; if(mData.length == 0 || nData.length == 0) { return 0; } if(mData[0].length != nData.length) { throw new Error("the two martrix data is not allowed to dot"); } var result = []; for(var i=0, len=mData.length; i<len; i++) { var mRow = mData[i]; result[i] = []; for(var j=0, jLen=mRow.length; j<jLen; j++) { var resultRowCol = 0; // 如果n矩陣沒有足夠的列數(shù)相乘，轉(zhuǎn)入m矩陣下一行 if(typeof this.findByLocation(nData, 0, j) === "undefined") { break; } for(var k=0, kLen=jLen; k<kLen; k++) { resultRowCol += mRow[k]*this.findByLocation(nData, k, j); } result[i][j] = resultRowCol; } } return result; } }; var m = new Matrix([[2, -1], [-2, 1], [-1, 2]]); var n = new Matrix([[4, -3], [3, 5]]); var result = M.multiply(m, n); printMatrixData(result); var m2 = new Matrix([[2, 3, 1], [5, 2, 4], [-3, 2, 0]]); var n2 = new Matrix([[11], [5], [8]]); var result2 = M.multiply(m2, n2); printMatrixData(result2); </script></html>更多關(guān)于JavaScript運(yùn)算相關(guān)內(nèi)容感興趣的讀者可查看本站專題：《JavaScript數(shù)學(xué)運(yùn)算用法總結(jié)》
希望本文所述對大家JavaScript程序設(shè)計(jì)有所幫助。
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