Introduction

It provides a lot of subroutines to manupulate the vectors.

Type

subroutines

Source

src/s_vector.f90

Usage

(1) Mesh generation

subroutine s_linspace_i(xmin, xmax, n, x)
subroutine s_linspace_d(xmin, xmax, n, x)
subroutine s_linspace_z(xmin, xmax, n, x)

To create a linear mesh x in interval [xmin, xmax], n is size of array x.

(2) Calculate sum of vector.

subroutine s_cumsum_i(n, v, vsum)
subroutine s_cumsum_d(n, v, vsum)
subroutine s_cumsum_z(n, v, vsum)

Return the cumsum of an array v. n is size of array v, and vsum is cumsum of array v.

(3) Calculate product of vector.

subroutine s_cumprod_i(n, v, vprod)
subroutine s_cumprod_d(n, v, vprod)
subroutine s_cumprod_z(n, v, vprod)

Return the cumproduct of an array v. n is size of array v, and vprod is cumprod of array v.

(4) Swap two vectors.

subroutine s_swap_i(n, ix, iy)
subroutine s_swap_d(n, dx, dy)
subroutine s_swap_z(n, zx, zy)

Exchange two vectors, where n is dimension of the vectors.

(5) Linear mixing for vectors.

subroutine s_mix_i(n, ix, iy, alpha)
subroutine s_mix_d(n, dx, dy, alpha)
subroutine s_mix_z(n, zx, zy, alpha)

Perform linear mixing for two vectors, where n is dimension of the vectors, and alpha is the mixing parameter $\alpha$.

(6) Convert diagonal elements of matrix to vector.

subroutine s_vecadd_i(n, ix, iy, alpha)
subroutine s_vecadd_d(n, dx, dy, alpha)
subroutine s_vecadd_z(n, zx, zy, alpha)

Try to add diagonal elements of a matrix to a vector, where n is dimension of the vectors, and alpha is the prefactor. *x is vector, and *y is a n-by-n matrix.