nd4j-common/src/main/java/org/nd4j/linalg/util/NioUtil.java
public static void copyAtStride(int n, BufferType bufferType, ByteBuffer from, int fromOffset, int fromStride,
                    ByteBuffer to, int toOffset, int toStride) {
        // TODO: implement shape copy for cases where stride == 1
        ByteBuffer fromView = from;
        ByteBuffer toView = to;
        fromView.order(ByteOrder.nativeOrder());
        toView.order(ByteOrder.nativeOrder());
        switch (bufferType) {
            case INT:
                IntBuffer fromInt = fromView.asIntBuffer();
                IntBuffer toInt = toView.asIntBuffer();
                for (int i = 0; i < n; i++) {
                    int put = fromInt.get(fromOffset + i * fromStride);
                    toInt.put(toOffset + i * toStride, put);
                }
                break;
            case FLOAT:
                FloatBuffer fromFloat = fromView.asFloatBuffer();
                FloatBuffer toFloat = toView.asFloatBuffer();
                for (int i = 0; i < n; i++) {
                    float put = fromFloat.get(fromOffset + i * fromStride);
                    toFloat.put(toOffset + i * toStride, put);
                }
                break;
            case DOUBLE:
                DoubleBuffer fromDouble = fromView.asDoubleBuffer();
                DoubleBuffer toDouble = toView.asDoubleBuffer();
                for (int i = 0; i < n; i++) {
                    toDouble.put(toOffset + i * toStride, fromDouble.get(fromOffset + i * fromStride));

                }
                break;
            default:
                throw new IllegalArgumentException("Only floats and double supported");

        }


    }
public static void copyAtStride(int n, BufferType bufferType, ByteBuffer from, int fromOffset, int fromStride,
                    ByteBuffer to, int toOffset, int toStride) {
        // TODO: implement shape copy for cases where stride == 1
        ByteBuffer fromView = from;
        ByteBuffer toView = to;
        fromView.order(ByteOrder.nativeOrder());
        toView.order(ByteOrder.nativeOrder());
        switch (bufferType) {
            case INT:
                IntBuffer fromInt = fromView.asIntBuffer();
                IntBuffer toInt = toView.asIntBuffer();
                for (int i = 0; i < n; i++) {
                    int put = fromInt.get(fromOffset + i * fromStride);
                    toInt.put(toOffset + i * toStride, put);
                }
                break;
            case FLOAT:
                FloatBuffer fromFloat = fromView.asFloatBuffer();
                FloatBuffer toFloat = toView.asFloatBuffer();
                for (int i = 0; i < n; i++) {
                    float put = fromFloat.get(fromOffset + i * fromStride);
                    toFloat.put(toOffset + i * toStride, put);
                }
                break;
            case DOUBLE:
                DoubleBuffer fromDouble = fromView.asDoubleBuffer();
                DoubleBuffer toDouble = toView.asDoubleBuffer();
                for (int i = 0; i < n; i++) {
                    toDouble.put(toOffset + i * toStride, fromDouble.get(fromOffset + i * fromStride));

                }
                break;
            default:
                throw new IllegalArgumentException("Only floats and double supported");

        }


    }
public static void copyAtStride ( int n , BufferType bufferType , ByteBuffer from , int fromOffset , int fromStride , ByteBuffer to , int toOffset , int toStride ) { // TODO: implement shape copy for cases where stride == 1 ByteBuffer fromView = from ; ByteBuffer toView = to ; fromView . order ( ByteOrder . nativeOrder ( ) ) ; toView . order ( ByteOrder . nativeOrder ( ) ) ; switch ( bufferType ) { case INT : IntBuffer fromInt = fromView . asIntBuffer ( ) ; IntBuffer toInt = toView . asIntBuffer ( ) ; for ( int i = 0 ; i < n ; i ++ ) { int put = fromInt . get ( fromOffset + i * fromStride ) ; toInt . put ( toOffset + i * toStride , put ) ; } break ; case FLOAT : FloatBuffer fromFloat = fromView . asFloatBuffer ( ) ; FloatBuffer toFloat = toView . asFloatBuffer ( ) ; for ( int i = 0 ; i < n ; i ++ ) { float put = fromFloat . get ( fromOffset + i * fromStride ) ; toFloat . put ( toOffset + i * toStride , put ) ; } break ; case DOUBLE : DoubleBuffer fromDouble = fromView . asDoubleBuffer ( ) ; DoubleBuffer toDouble = toView . asDoubleBuffer ( ) ; for ( int i = 0 ; i < n ; i ++ ) { toDouble . put ( toOffset + i * toStride , fromDouble . get ( fromOffset + i * fromStride ) ) ; } break ; default : throw new IllegalArgumentException ( "Only floats and double supported" ) ; } }
Copy from the given from buffer
to the to buffer at the specified
offsets and strides
@param n
@param bufferType
@param from the origin buffer
@param fromOffset the starting offset
@param fromStride the stride at which to copy from the origin
@param to the destination buffer
@param toOffset the starting point
@param toStride the to stride
Copy from the given from buffer to the to buffer at the specified offsets and strides