For example, if a is upper triangular, you can set opts.

举个例子，如果A矩阵是上三角矩阵，你能够调整选择。

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Often this part of the page is the triangular area in the upper-left corner.

这个区域就在页面左上角的三角地带。

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Often this part of the page is the triangular area in the upper-left corner.

这个区域就在页面左上角的三角地带。

youdao