SUMMATION

Block Screenshot

Contents

• Description
• Parameters
• Default properties
• Interfacing function
• Computational function
• See also

Description

This block performs addition or subtraction on scalar, vector or matrix inputs. The input datatype is set with the Datatype parameter. The Number of inputs or sign vector parameter defines the number of inputs and operation. For a single vector's input the block collapse the elements of the vector. Vectors/matrices inputs must have the same size.

The behavior of the block is summarized in the following table :

With integer input, on overflow the result can take different forms:

1- A normal non saturated result. By example, if type is int8 and the result 128, the block output value will be -128.

2- A saturated result. For the previous example the block output value will be 127.

3- An error message warning the user about the overflow.

The user can select one of these three forms by setting the Do on Overflow field to 0, 1 or 2.

Parameters

• Datatype (1=real double 2=complex 3=int32 ...)

  It indicates the type of the input/output data. It support all datatype, number must be between 1 and 8.

  Properties : Type 'vec' of size 1.

• Number of inputs or sign vector (of +1,-1)

  It indicates the number of inputs and the operation see the description for more detail. If you set a value other of -1 or +1, you get an error message box.

  Properties : Type 'vec' of size -1.

• Do on Overflow(0=Nothing 1=Saturate 2=Error)

  When this parameter is set to zero the result is similar to a normal summation of two integer matrix. When it is set to 1, on overflow the block saturate the result. When it is set to 2, on overflow an error message box appears. If the Data type is double or complex this parameter is not used.

  Properties : Type 'vec' of size 1.

Default properties

• always active: no

• direct-feedthrough: yes

• zero-crossing: no

• mode: no

• regular inputs:

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

  - port 2 : 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: summation

Interfacing function

• SCI/modules/scicos_blocks/macros/Linear/SUMMATION.sci

Computational function

• SCI/modules/scicos_blocks/src/c/summation.c
• SCI/modules/scicos_blocks/src/c/summation_z.c
• SCI/modules/scicos_blocks/src/c/summation_i32n.c
• SCI/modules/scicos_blocks/src/c/summation_i16n.c
• SCI/modules/scicos_blocks/src/c/summation_i8n.c
• SCI/modules/scicos_blocks/src/c/summation_ui32n.c
• SCI/modules/scicos_blocks/src/c/summation_ui16n.c
• SCI/modules/scicos_blocks/src/c/summation_ui8n.c
• SCI/modules/scicos_blocks/src/c/summation_i32s.c
• SCI/modules/scicos_blocks/src/c/summation_i16s.c
• SCI/modules/scicos_blocks/src/c/summation_i8s.c
• SCI/modules/scicos_blocks/src/c/summation_ui32s.c
• SCI/modules/scicos_blocks/src/c/summation_ui16s.c
• SCI/modules/scicos_blocks/src/c/summation_ui8s.c
• SCI/modules/scicos_blocks/src/c/summation_i32e.c
• SCI/modules/scicos_blocks/src/c/summation_i16e.c
• SCI/modules/scicos_blocks/src/c/summation_i8e.c
• SCI/modules/scicos_blocks/src/c/summation_ui32e.c
• SCI/modules/scicos_blocks/src/c/summation_ui16e.c
• SCI/modules/scicos_blocks/src/c/summation_ui8e.c

See also

• BIGSOM_f — Scalar or vector Addition/Soustraction
• SUM_f — Addition