pySimBlocks.blocks.operators.sum

class pySimBlocks.blocks.operators.sum.Sum(name: str, signs: str | None = None, sample_time: float | None = None)

Bases: Block

Multi-input signed summation block.

Computes an element-wise signed sum of multiple 2D input signals. All non-scalar inputs must share the same shape; scalar (1,1) inputs are broadcast to that shape.

signs

List of +1.0 or -1.0 coefficients, one per input port.

num_inputs

Number of input ports.

direct_feedthrough = True

True if outputs depend directly on inputs.

initialize(t0: float) → None

Compute the initial output if all inputs are available.

Parameters:

t0 – Initial simulation time in seconds.

output_update(t: float, dt: float) → None

Compute the signed element-wise sum and write it to the output port.

Parameters:

• t – Current simulation time in seconds.

• dt – Current time step in seconds.

Raises:

• RuntimeError – If any input port is not connected.

• ValueError – If any input is not 2D or non-scalar inputs have inconsistent shapes.

state_update(t: float, dt: float) → None

No-op: Sum is a stateless block.

Parameters:

• t – Current simulation time in seconds.

• dt – Current time step in seconds.