Java 对于稀疏矩阵，EJML重塑函数是否有效？

我想动态地改变稀疏矩阵的维数。然而，我关心的是效率。这个操作是否将第一个矩阵的所有内容复制到一个更大的矩阵中？在这种情况下，是否最好将矩阵维数增加100？在这种情况下，java文档似乎没有谈论效率。

它不会复制值，应该非常快。它确实用零填充列索引，因为这是稀疏格式的一部分

@Override
public void reshape( int numRows , int numCols , int arrayLength ) {
    // OK so technically it is sorted, but forgetting to correctly set this flag is a common mistake so
    // decided to be conservative and mark it as unsorted so that stuff doesn't blow up
    this.indicesSorted = false;
    this.numRows = numRows;
    this.numCols = numCols;
    growMaxLength( arrayLength , false);
    this.nz_length = 0;

    if( numCols+1 > col_idx.length ) {
        col_idx = new int[ numCols+1 ];
    } else {
        Arrays.fill(col_idx,0,numCols+1,0);
    }
}

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它不会复制值，应该非常快。它确实用零填充列索引，因为这是稀疏格式的一部分

@Override
public void reshape( int numRows , int numCols , int arrayLength ) {
    // OK so technically it is sorted, but forgetting to correctly set this flag is a common mistake so
    // decided to be conservative and mark it as unsorted so that stuff doesn't blow up
    this.indicesSorted = false;
    this.numRows = numRows;
    this.numCols = numCols;
    growMaxLength( arrayLength , false);
    this.nz_length = 0;

    if( numCols+1 > col_idx.length ) {
        col_idx = new int[ numCols+1 ];
    } else {
        Arrays.fill(col_idx,0,numCols+1,0);
    }
}