Java 无法从 txt 文件中读取和打印矩阵

Question

我有一个矩阵 txt 文件 (11x25)。

0.611104586 0.421137301 0.148175838 0.093093778 0.528511286 0.418664735 0.501390139 0.02206688  0.103546871 0.633455719 0.265081895 0.451747788 0.329214309 0.60249002  0.662946576 0.44162406  0.371196059 0.084083877 0.589799899 0.18569671  0.034511745 0.302195181 0.278790488 0.031898972 0.697455224
0   0.126780289 0.744394666 0.48235826  0.757190046 0   0.982900393 0   0.428819183 0.341336135 0.248345722 0.340234421 0   0.505015206 0.844733493 0   0.520242556 0.839144273 0.944768681 0   0   0.911173675 0.96852497  0.513269179 0
0.719522104 0.904803048 0   0.438443555 0.619019934 0.770586942 0.035069914 0.284726903 0   0.900156226 0   0.614178016 0.756121647 0   0.482162641 0.346972852 0   0.530160102 0.607970986 0   0   0.70776022  0.630313049 0.537430321 0.429637915
0.965552324 0.237316539 0   0.675540672 0.02245449  0   0.906837513 0.046865469 0.985370941 0   0   0.581136159 0   0.731418151 0.410065655 0.185012435 0.810102943 0.061834628 0.760408343 0.52844337  0.106327038 0.764641701 0   0.241043197 0.138591668
0.785265388 0.245375911 0.003825113 0.392088166 0.746347629 0   0.865455277 0   0.320064792 0.469631124 0.275800621 0.226402945 0.196849125 0.3767231   0   0.504222038 0.252534767 0   0.108825926 0.038854648 0   0   0.837990169 0.233463218 0.973794244
0   0.369290247 0.391632502 0.966710703 0.456646601 0.744378787 0.500206874 0.429575161 0.4157577   0.682093427 0   0   0.88518823  0.545062518 0.844007009 0.209436674 0.532083535 0.643254912 0.022206966 0.972272975 0.207677119 0.619557286 0.684530833 0.039768814 0.566273215
0.719277709 0.370218186 0   0.528553716 0   0.474043295 0.644709559 0.096042971 0.078666296 0.667435055 0.440727479 0.859297227 0.18165689  0.068277826 0.289860387 0.208112415 0.626884285 0.295818382 0.756532711 0   0.470774563 0.560703247 0.040089639 0   0.910059573
0.350135065 0.250992266 0   0.762270073 0.649714246 0.382709691 0   0.434548143 0.096899503 0.221095404 0.207416989 0   0.142452936 0.063563437 0.519824118 0.318727424 0.033631564 0.34535148  0   0.050335104 0   0.085647088 0   0.970307046 0.489823431
0.549077625 0.786267574 0.310947619 0   0.855403201 0.356727854 0.448585797 0.858197183 0.164926857 0.632894281 0.883520503 0.477562449 0   0   0.054450728 0.581420285 0.405555966 0   0.595676984 0.581284627 0.294128393 0   0.022840426 0.442097113 0.168690247
0.773515517 0.667867116 0   0.384918608 0.495617591 0.960445903 0   0.521981671 0.582565937 0.000392407 0.729931754 0.003648767 0   0.959536544 0.308279485 0   0.992524156 0.078062129 0   0.425848147 0   0.146881857 0.488967009 0.914247178 0.556155216
0.20589258  0.113521908 0.215750666 0.241288747 0.803876238 0   0.219172738 0       0   0.560754999 0   0.480321026 0.21864147  0   0.756257475 0.99148594  0.795855095 0.947866607 0.642933671 0.988902986 0   0   0.865736296 0.745107083 0.125387319

尝试在矩阵[i][j]中以矩阵形式读取、存储和打印，但始终无法正确读取和打印。这是我在 Java

中的部分代码

            static double [][] matrix = new double[20][50];

            FileReader fr = new FileReader("TM.txt");
            BufferedReader br = new BufferedReader(fr);

            String line = null;
            int lineCount = 0;
            while ((line = br.readLine()) != null)
            {
                String[] numbers = line.split(" ");
                for ( int i = 0 ; i < 25 ; i++) {
                     matrix[lineCount][i] = Double.parseDouble(numbers[i].trim());
                    System.out.println(matrix[lineCount][i] + " " + i + " " +lineCount);  
                }
                lineCount++;

            }
            System.out.println(matrix[1][5] + " ");//Note 2

            for ( int i = 0; i < 10; i++){
                for (int j = 0; j < 25; j++){

                    System.out.println(matrix[i][j] + " ");

                }

            }//Note 3.

注1.错误信息：（已解决。谢谢:)）

Exception in thread "main" java.lang.Error: Unresolved compilation problem: 
i cannot be resolved to a variable

注意 2. 始终打印出 0.0，无论我在矩阵中输入什么，例如矩阵[1][2].

注3.我想把矩阵打印出来，结果全是0。

Note 2 和 3 的问题仍然存在。不确定我是否需要存储从 txt 文件中读取的矩阵才能使用它。

感谢您的帮助！

Answer 1

使用 {} 分隔 for 循环体，因为目前 System.out.println(....) 语句在循环之外。

例如：

for ( int i = 0 ; i < 25 ; i++){
    matrix[lineCount][i] = Double.parseDouble(numbers[i]);
    System.out.println(matrix[lineCount][i] + " ")
}

Answer 2

i cannot be resolved to a variable.

       while ((line = br.readLine()) != null)
        {
            String[] numbers = line.split("\W+");
            for ( int i = 0 ; i < 25 ; i++){ 
                 matrix[lineCount][i] = Double.parseDouble(numbers[i].trim());
                 System.out.println(matrix[lineCount][i] + " " + i + " " +lineCount);
            }//Note 1
            lineCount++;

        }

还有一个是

 static double [][] matrix = new double[20][25];//just increase the size

Java 无法从 txt 文件中读取和打印矩阵

Java failed to read and print matrix from txt file

java

printing

matrix

filereader