Question

我试图根据某些条件改变（乘以一个int）3个不同矩阵中某个位置（i，j）的值。然而，当我打印整个矩阵时，似乎它将第一个矩阵乘以所有的整数（即使是第二个和第三个矩阵的那个。

这里我声明全局矩阵和属性，包括一些内存分配：

int HEIGHT;
int WIDTH;
int ** matrixR= new int*[HEIGHT];
int ** matrixG= new int*[HEIGHT];
int ** matrixB= new int*[HEIGHT];

然后，在函数中我完成矩阵：

for(i=0; i<HEIGHT; i++){
        matrixR[i]= new int[WIDTH];
        matrixG[i]= new int[WIDTH];
        matrixB[i]= new int[WIDTH];
}

以下是我为每个矩阵评估的条件：

for (int i = 0; i < HEIGHT; ++i) {
    for (int j = 0; j < WIDTH; ++j) {
        float suma = pow(i - centerY, 2) + pow(j - centerX, 2);
        if (suma > pow(radius, 2)) {
            matrixR[i][j] = matrixR[i][j] * 1;
        }
    }

}

for (int i = 0; i < HEIGHT; ++i) {
    for (int j = 0; j < WIDTH; ++j) {
        float suma = pow(i - centerY, 2) + pow(j - centerX, 2);
        if (suma > pow(radius, 2)) {
            matrixG[i][j] = matrixG[i][j] * 2;
        }
    }
}

for (int i = 0; i < HEIGHT; ++i) {
    for (int j = 0; j < WIDTH; ++j) {
        float suma = pow(i - centerY, 2) + pow(j - centerX, 2);
        if (suma > pow(radius, 2)) {
            matrixB[i][j] = matrixB[i][j] * 3;
        }
    }
}

然后当我打印第一个矩阵的元素时：

for (int k = 0; k < HEIGHT; ++k) {
    for (int i = 0; i < WIDTH; ++i) {
        cout << matrixR[k][i] << " | ";
    }
    cout << '\n';
}

我应该获得matrixR[i][j]*1我得到matrixB[i][j]。矩阵是否会互相覆盖？有什么不对吗？

Answer 1

我添加了centerX，centerY和radius的值，并添加了一个初始化部分（所有矩阵元素都是后面的一个）。

我找不到错误，输出是

1 | 1 | 1 | 1 | 1 | 1 | 1 |
1 | 1 | 1 | 1 | 1 | 1 | 1 |
1 | 1 | 1 | 1 | 1 | 1 | 1 |
1 | 1 | 1 | 1 | 1 | 1 | 1 |
1 | 1 | 1 | 1 | 1 | 1 | 1 |


2 | 2 | 2 | 2 | 2 | 2 | 2 |
2 | 2 | 2 | 2 | 2 | 2 | 2 |
2 | 2 | 2 | 1 | 2 | 2 | 2 |
2 | 2 | 1 | 1 | 1 | 2 | 2 |
2 | 2 | 2 | 1 | 2 | 2 | 2 |


3 | 3 | 3 | 3 | 3 | 3 | 3 |
3 | 3 | 3 | 3 | 3 | 3 | 3 |
3 | 3 | 3 | 1 | 3 | 3 | 3 |
3 | 3 | 1 | 1 | 1 | 3 | 3 |
3 | 3 | 3 | 1 | 3 | 3 | 3 |

这是我使用过的代码：

// init variables
int HEIGHT = 5;
int WIDTH = 7;
int centerY = 3;
int centerX = 3;
int radius = 1;



int ** matrixR= new int*[HEIGHT];
int ** matrixG= new int*[HEIGHT];
int ** matrixB= new int*[HEIGHT];

for(int i=0; i<HEIGHT; i++){
        matrixR[i]= new int[WIDTH];
        matrixG[i]= new int[WIDTH];
        matrixB[i]= new int[WIDTH];
}


// init matrix values
{
for (int k = 0; k < HEIGHT; ++k)
    for (int i = 0; i < WIDTH; ++i)
        matrixR[k][i] = 1;

for (int k = 0; k < HEIGHT; ++k)
    for (int i = 0; i < WIDTH; ++i)
        matrixG[k][i] = 1;

for (int k = 0; k < HEIGHT; ++k)
    for (int i = 0; i < WIDTH; ++i)
        matrixB[k][i] = 1;
}


for (int i = 0; i < HEIGHT; ++i) {
    for (int j = 0; j < HEIGHT; ++j) {
        float suma = pow(static_cast< double >(i) - centerY, 2) + pow( static_cast< double >( j ) - centerX, 2);
        if (suma > pow( static_cast< double >( radius ), 2)) {
            matrixR[i][j] = matrixR[i][j] * 1;
        }
    }

}

for (int i = 0; i < HEIGHT; ++i) {
    for (int j = 0; j < WIDTH; ++j) {
        float suma = pow( static_cast< double >( i ) - centerY, 2) + pow( static_cast< double >( j ) - centerX, 2);
        if (suma > pow( static_cast< double >( radius ), 2)) {
            matrixG[i][j] = matrixG[i][j] * 2;
        }
    }
}

for (int i = 0; i < HEIGHT; ++i) {
    for (int j = 0; j < WIDTH; ++j) {
        float suma = pow( static_cast< double >( i ) - centerY, 2) + pow( static_cast< double >( j ) - centerX, 2);
        if (suma > pow( static_cast< double >( radius ), 2)) {
            matrixB[i][j] = matrixB[i][j] * 3;
        }
    }
}

for (int k = 0; k < HEIGHT; ++k) {
    for (int i = 0; i < WIDTH; ++i) {
        cout << matrixR[k][i] << " | ";
    }
    cout << '\n';
}

cout << '\n';
cout << '\n';

for (int k = 0; k < HEIGHT; ++k) {
    for (int i = 0; i < WIDTH; ++i) {
        cout << matrixG[k][i] << " | ";
    }
    cout << '\n';
}

cout << '\n';
cout << '\n';

for (int k = 0; k < HEIGHT; ++k) {
    for (int i = 0; i < WIDTH; ++i) {
        cout << matrixB[k][i] << " | ";
    }
    cout << '\n';
}

std::cin.get();

Answer 2

添加了这个以使其编译并运行：

public function cmsField($observer)
{

    // $model = Mage::registry('cms_page');

    $form = $observer->getEvent()->getForm();

    $fieldset = $form->addFieldset('example_metainfo_fieldset', array('legend'=>Mage::helper('cms')->__('Meta Info'),'class'=>'fieldset-wide'));
    //add new field
    $fieldset->addField('metatitle', 'text', array(
        'name'      => 'metatitle',
        'label'     => Mage::helper('cms')->__('Metatitle'),
        'title'     => Mage::helper('cms')->__('Metatitle'),
        'disabled'  => false,
        //set field value
        // 'value'     => $model->getMetatitle()
    ));

    $form->setValues(Mage::registry('cms_page')->getData());
}

输出我看起来很好......

矩阵互相覆盖

2 个答案: