dcopy {bigalgebra} | R Documentation |

## Copy a vector.

### Description

Copy double precision DX to double precision DY. For I = 0 to N-1, copy DX(LX+I*INCX) to DY(LY+I*INCY), where LX = 1 if INCX .GE. 0, else LX = 1+(1-N)*INCX, and LY is defined in a similar way using INCY.

### Usage

```
dcopy(N = NULL, X, INCX = 1, Y, INCY = 1)
```

### Arguments

`N` |
number of elements in input vector(s) |

`X` |
double precision vector with N elements |

`INCX` |
storage spacing between elements of DX |

`Y` |
double precision vector with N elements |

`INCY` |
storage spacing between elements of DY |

### Value

DY copy of vector DX (unchanged if N .LE. 0)

### References

C. L. Lawson, R. J. Hanson, D. R. Kincaid and F. T. Krogh, Basic linear algebra subprograms for Fortran usage, Algorithm No. 539, Transactions on Mathematical Software 5, 3 (September 1979), pp. 308-323.

### Examples

```
## Not run:
set.seed(4669)
A = big.matrix(3, 2, type="double", init=1, dimnames=list(NULL,
c("alpha", "beta")), shared=FALSE)
B = big.matrix(3, 2, type="double", init=0, dimnames=list(NULL,
c("alpha", "beta")), shared=FALSE)
dcopy(X=A,Y=B)
A[,]-B[,]
# The big.matrix file backings will be deleted when garbage collected.
rm(A,B)
gc()
## End(Not run)
```

[Package

*bigalgebra*version 1.1.1 Index]