CUMSUM

Block Screenshot

Contents

• Cumulative Sum

• • Palette

  • Description

  • Dialog box

  • Example

  • Default properties

  • Interfacing function

  • Computational function

  • See also

Palette

• Matrix operation palette

Description

The CUMSUM block cumulatively sums the element of an input MxN matrix U along either the rows, the columns or the first non singleton dimension. The size of the output is also MxN.

When the Sum along parameter is set to:

• 1: the block progressively sums across the elements of each row.

• 2: the block progressively sums across the elements of each column.

• 0: the block progressively sums across the first non singleton dimension.

The equivalent function in Scilab is cumsum.

Dialog box

• Datatype(1=real double 2=Complex)

  It indicates the type of the output. It support only the two types double (1) and complex (2). If we input another entry in this label Scicos will print the message "Datatype is not supported".

  Properties : Type 'vec' of size 1.

• Sum along (0=the first non singleton dimension 1=Rows 2=Columns)

  Indicate whether to cumulatively sum across the rows, the columns or the first non singleton dimension.

  Properties : Type 'vec' of size 1.

Example

A = [1 2 3 ; 4 5 6 ; 7 8 9]
If the sum is along the row the result will be:
B = [1 2 3 ; 5 7 9 ; 12 15 18]

Default properties

• always active: no

• direct-feedthrough: yes

• zero-crossing: no

• mode: no

• regular inputs:

  - port 1: size [-1,-2] / type 1

• regular outputs:

  - port 1: size [-1,-2] / type 1

• number/sizes of activation inputs: 0

• number/sizes of activation outputs: 0

• continuous-time state: no

• discrete-time state: no

• object discrete-time state: no

• name of computational function: cumsum_m

Interfacing function

• SCI/modules/scicos_blocks/macros/MatrixOp/CUMSUM.sci

Computational function

• SCI/modules/scicos_blocks/src/c/cumsum_m.c

• SCI/modules/scicos_blocks/src/c/cumsum_r.c

• SCI/modules/scicos_blocks/src/c/cumsum_c.c

• SCI/modules/scicos_blocks/src/c/cumsumz_m.c

• SCI/modules/scicos_blocks/src/c/cumsumz_r.c

• SCI/modules/scicos_blocks/src/c/cumsumz_c.c

Cumulative Sum example

See also

• MATSUM - Sum of Matrix's Elements (xcos Block)

• cumsum (Scilab function)