63 lines
1.2 KiB
Markdown
63 lines
1.2 KiB
Markdown
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# Tri
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This is a static function Construct a matrix with ones at and below the given diagonal and zeros elsewhere.
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```
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static matrix matrix::Tri(
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const ulong rows, // number of rows
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const ulong cols, // number of columns
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const int ndiag=0 // number of diagonal
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);
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```
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Parameters
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rows
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[in] Number of rows in the array.
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cols
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[in] Number of columns in the array.
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ndiag=0
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[in] The sub-diagonal at and below which the array is filled. k = 0 is the main diagonal, while k < 0 is below it, and k > 0 is above. The default is 0.
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Return Value
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Array with its lower triangle filled with ones and zero elsewhere.
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MQL5 example:
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```
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matrix matrix_a=matrix::Tri(3,4,1);
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Print("Tri(3,4,1)\n",matrix_a);
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matrix_a=matrix::Tri(4,3,-1);
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Print("Tri(4,3,-1)\n",matrix_a);
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/*
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Tri(3,4,1)
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[[1,1,0,0]
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[1,1,1,0]
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[1,1,1,1]]
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Tri(4,3,-1)
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[[0,0,0]
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[1,0,0]
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[1,1,0]
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[1,1,1]]
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*/
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```
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Example
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```
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np.tri(3, 5, 2, dtype=int)
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array([[1, 1, 1, 0, 0],
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[1, 1, 1, 1, 0],
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[1, 1, 1, 1, 1]])
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```
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