vsum

Functions

int main(int argc, char *argv[])

vsum [ option ] [ infile ]

• -l int

  • length of vector $(1\le L)$

• -m int

  • order of vector $(0\le L-1)$

• -t int

  • output interval $(1\le T)$

• infile str

  • double-type vectors

• stdout

  • double-type summation

The input of this command is

$$\begin{array}{ccc}\underset{L}{\underbrace{x_1(1),\dots ,x_1(L)}},& \underset{L}{\underbrace{x_2(1),\dots ,x_2(L)}},& \dots ,\end{array}$$

and the output is

$$\begin{array}{ccc}\underset{L}{\underbrace{s_0(1),\dots ,s_0(L)}},& \underset{L}{\underbrace{s_T(1),\dots ,s_T(L)}},& \dots ,\end{array}$$

where

$$s_t(l)=\sum _{\tau =1}^T{x}_{t+\tau }(l).$$

If $T$ is not given, the summation of the whole input is computed.

echo 0 1 2 3 4 5 6 7 8 9 | x2x +ad | vsum -l 2 | x2x +da
# 20
# 25

echo 0 1 2 3 4 5 6 7 | x2x +ad | vsum -l 2 -t 2 | x2x +da
# 2
# 4
# 10
# 12

Parameters

• argc – [in] Number of arguments.

• argv – [in] Argument vector.

Returns

0 on success, 1 on failure.

See also

average vstat