Package org.jblas

Class JavaBlas

java.lang.Object
org.jblas.JavaBlas

public class JavaBlas extends Object

Implementation of some Blas functions, mostly those which require linear runtime in the number of matrix elements. Because of the copying overhead when passing primitive arrays to native code, it doesn't make sense for these functions to be implemented in native code. The Java code is about as fast.

The same conventions were used as in the native code, that is, for each array you also pass an index pointing to the starting index.

These methods are mostly optimized for the case where the starting index is 0 and the increment is 1.

  • Constructor Summary

    Constructors
    Constructor
    Description
     
  • Method Summary

    Modifier and Type
    Method
    Description
    static void
    raxpy(int n, double da, double[] dx, int dxIdx, int incx, double[] dy, int dyIdx, int incy)
    Compute dy <- da * dx + dy.
    static void
    raxpy(int n, float da, float[] dx, int dxIdx, int incx, float[] dy, int dyIdx, int incy)
    Compute dy <- da * dx + dy.
    static void
    rcopy(int n, double[] dx, int dxIdx, int incx, double[] dy, int dyIdx, int incy)
    Copy dx to dy.
    static void
    rcopy(int n, float[] dx, int dxIdx, int incx, float[] dy, int dyIdx, int incy)
    Copy dx to dy.
    static double
    rdot(int n, double[] dx, int dxIdx, int incx, double[] dy, int dyIdx, int incy)
    Compute scalar product between dx and dy.
    static float
    rdot(int n, float[] dx, int dxIdx, int incx, float[] dy, int dyIdx, int incy)
    Compute scalar product between dx and dy.
    static void
    rswap(int n, double[] dx, int dxIdx, int incx, double[] dy, int dyIdx, int incy)
    Exchange two vectors.
    static void
    rswap(int n, float[] dx, int dxIdx, int incx, float[] dy, int dyIdx, int incy)
    Exchange two vectors.
    static void
    rzaxpy(int n, double[] dz, int dzIdx, int incz, double da, double[] dx, int dxIdx, int incx, double[] dy, int dyIdx, int incy)
    Computes dz <- dx + dy
    static void
    rzaxpy(int n, float[] dz, int dzIdx, int incz, float da, float[] dx, int dxIdx, int incx, float[] dy, int dyIdx, int incy)
    Computes dz <- dx + dy
    static void
    rzgxpy(int n, double[] dz, double[] dx, double[] dy)
     
    static void
    rzgxpy(int n, float[] dz, float[] dx, float[] dy)
     

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
  • Constructor Details

  • Method Details

    • rswap

      public static void rswap(int n, double[] dx, int dxIdx, int incx, double[] dy, int dyIdx, int incy)
      Exchange two vectors.
    • rcopy

      public static void rcopy(int n, double[] dx, int dxIdx, int incx, double[] dy, int dyIdx, int incy)
      Copy dx to dy.
    • raxpy

      public static void raxpy(int n, double da, double[] dx, int dxIdx, int incx, double[] dy, int dyIdx, int incy)
      Compute dy <- da * dx + dy.
    • rzaxpy

      public static void rzaxpy(int n, double[] dz, int dzIdx, int incz, double da, double[] dx, int dxIdx, int incx, double[] dy, int dyIdx, int incy)
      Computes dz <- dx + dy
    • rzgxpy

      public static void rzgxpy(int n, double[] dz, double[] dx, double[] dy)
    • rdot

      public static double rdot(int n, double[] dx, int dxIdx, int incx, double[] dy, int dyIdx, int incy)
      Compute scalar product between dx and dy.
    • rswap

      public static void rswap(int n, float[] dx, int dxIdx, int incx, float[] dy, int dyIdx, int incy)
      Exchange two vectors.
    • rcopy

      public static void rcopy(int n, float[] dx, int dxIdx, int incx, float[] dy, int dyIdx, int incy)
      Copy dx to dy.
    • raxpy

      public static void raxpy(int n, float da, float[] dx, int dxIdx, int incx, float[] dy, int dyIdx, int incy)
      Compute dy <- da * dx + dy.
    • rzaxpy

      public static void rzaxpy(int n, float[] dz, int dzIdx, int incz, float da, float[] dx, int dxIdx, int incx, float[] dy, int dyIdx, int incy)
      Computes dz <- dx + dy
    • rzgxpy

      public static void rzgxpy(int n, float[] dz, float[] dx, float[] dy)
    • rdot

      public static float rdot(int n, float[] dx, int dxIdx, int incx, float[] dy, int dyIdx, int incy)
      Compute scalar product between dx and dy.