eye.hpp

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#pragma once
 
#include "NumCpp/Core/Internal/StaticAsserts.hpp"
#include "NumCpp/Core/Shape.hpp"
#include "NumCpp/Core/Types.hpp"
#include "NumCpp/NdArray.hpp"
 
namespace nc
{
    //============================================================================
    // Method Description:
    template<typename dtype>
    NdArray<dtype> eye(uint32 inN, uint32 inM, int32 inK = 0)
    {
        STATIC_ASSERT_ARITHMETIC_OR_COMPLEX(dtype);
 
        NdArray<dtype> returnArray(inN, inM);
        returnArray.zeros();
 
        if (inK < 0)
        {
            uint32 col = 0;
            for (uint32 row = inK; row < inN; ++row)
            {
                if (col >= inM)
                {
                    break;
                }
 
                returnArray(row, col++) = dtype{ 1 };
            }
        }
        else
        {
            uint32 row = 0;
            for (uint32 col = inK; col < inM; ++col)
            {
                if (row >= inN)
                {
                    break;
                }
 
                returnArray(row++, col) = dtype{ 1 };
            }
        }
 
        return returnArray;
    }
 
    //============================================================================
    // Method Description:
    template<typename dtype>
    NdArray<dtype> eye(uint32 inN, int32 inK = 0)
    {
        return eye<dtype>(inN, inN, inK);
    }
 
    //============================================================================
    // Method Description:
    template<typename dtype>
    NdArray<dtype> eye(const Shape& inShape, int32 inK = 0)
    {
        return eye<dtype>(inShape.rows, inShape.cols, inK);
    }
} // namespace nc