Number OutputList

A number range node that won't lose precision on your LoRA sweep

By geroldmeisinger·Created 9 months ago·Updated about 7 hours ago· 183

Number OutputList

int
float
string
index
count

◄start0.00►

◄stop10.00►

◄num10►

◄endpointfalse►

Number OutputList is the smallest node in the pack and one you'll use constantly once it's there: it generates a range of numbers as an output list. LoRA strength sweeps, image width/height variants, animation frame counts - every time you'd otherwise type out 0.4, 0.7, 1.0 by hand, this is the replacement.

The mechanism is worth knowing because it's the reason this node exists at all: it uses numpy.linspace internally instead of naive step arithmetic. Float ranges generated by repeated addition accumulate rounding error fast (0.1 + 0.2 never quite equals 0.3), and linspace sidesteps that by computing even spacing directly. For animation sweeps that need clean values, that's the difference between a list ending in 0.8999999 and one ending in 0.9.

The inputs that matter

start and stop - the range bounds (floats).
num - the number of items, not a step size. This is the classic trap: num=5 from 0 to 10 gives five evenly spaced values, not "every 5th". Don't confuse it with a step.
endpoint - whether stop is included. Off by default; flip it on when you want the top value present.

Outputs are four output lists plus a plain count: int (values floored down - note it rounds down, so 0.9 becomes 0), float, string (for prompts and filenames), and index (0..count, for labels and row/col tracking).

When you'd actually use it

The pack's README example is a great template: connect two Number OutputLists (one descending) to image width and height to sweep 256/512/768 × 768/512/256 - portrait, square, and landscape in one run, each image its own size because it's a list. For the animation-LoRA-strength example, use num+1 with endpoint=True so the sweep includes 1.0 cleanly.

Need arbitrary values or uneven steps instead of a clean range? Skip this node and use JSON OutputList with a literal array like [1, 42, 123] - the README calls this out explicitly, and it's the right tool for "I want these specific values."

Installing

Search "OutputLists Combiner" in ComfyUI Manager, or clone it into ComfyUI/custom_nodes:

cd ComfyUI/custom_nodes
git clone https://github.com/geroldmeisinger/ComfyUI-outputlists-combiner
cd ComfyUI-outputlists-combiner
uv pip install -r requirements.txt

Restart after installing. No model files, no extra downloads - the pandas and skia-python deps are shared with the pack's other nodes.

CategoryUtility

Inputs (4)

Name	Type	Default	Description
start	FLOAT	0.00	Start value to generate the range from.
stop	FLOAT	10.00	End value. If `endpoint=include` then this number is included in the list.
num	INT	10	The number of items in the list (don't confuse it with a `step`).
endpoint	BOOLEAN	false	Decides if the `stop` value should be included or excluded in the items.

Outputs (5)

Name	Type	Description
int	INT	The value converted to int (rounded down/floored). use(s) `is_output_list=True` (indicated by the symbol `𝌠`) and will be processed sequentially by corresponding nodes.
float	FLOAT	The value as a float. use(s) `is_output_list=True` (indicated by the symbol `𝌠`) and will be processed sequentially by corresponding nodes.
string	STRING	The value as a float converted to string. use(s) `is_output_list=True` (indicated by the symbol `𝌠`) and will be processed sequentially by corresponding nodes.
index	INT	Range of 0..count which can be used as an index. use(s) `is_output_list=True` (indicated by the symbol `𝌠`) and will be processed sequentially by corresponding nodes.
count	INT	Same as `num`.