Logarithmic Operation¶
Performs logarithmic and exponential calculations on a single numeric value. Supports custom-base logarithm, natural log, base-10, base-2 logs, and exponential functions with base e or 2. Inputs are validated to avoid invalid domains (e.g., non-positive values for logs), returning 0.0 when invalid.
Usage¶
Use this node whenever you need logarithmic transformations or exponential growth calculations in a workflow. Typical use cases include scaling values, converting between orders of magnitude, computing natural or base-specific logs, or generating exponential outputs for further math or control logic. Choose the operation and set the value (and base when using custom log).
Inputs¶
| Field | Required | Type | Description | Example |
|---|---|---|---|---|
| value | True | FLOAT | The numeric input to operate on. Must be > 0 for log operations; can be any float for exp operations. | 8.0 |
| base | True | FLOAT | Base for the custom logarithm when operation is 'log'. Must be > 0 and not equal to 1. Ignored for ln, log10, log2, exp, and exp2. | 2.0 |
| operation | True | STRING | Select the operation: 'log' (custom base), 'ln' (natural log), 'log10', 'log2', 'exp' (e^value), or 'exp2' (2^value). | log2 |
Outputs¶
| Field | Type | Description | Example |
|---|---|---|---|
| result | FLOAT | The computed result of the selected logarithmic or exponential operation. | 3.0 |
Important Notes¶
- Input domains: For 'log' the value must be > 0, base > 0, and base != 1. For 'ln', 'log10', and 'log2', the value must be > 0.
- Ignored base: The 'base' input is only used for the 'log' operation; it is ignored for all other operations.
- Out-of-range handling: Invalid inputs or math errors return 0.0. Extremely large exponents may overflow and likewise return 0.0.
- Precision: Results are floating-point and subject to standard floating-point precision behavior.
- Defaults and ranges: UI constraints typically enforce value/base within [0.001, 1e10]; adjust upstream if smaller or negative values are needed for non-log operations.
Troubleshooting¶
- Result is 0.0 for logs: Ensure 'value' > 0; for 'log', also ensure 'base' > 0 and 'base' != 1.
- Unexpected 0.0 for exp: The input may be too large causing overflow. Reduce 'value' or normalize your input before applying 'exp'/'exp2'.
- Base seems to have no effect: The 'base' parameter only affects the 'log' operation. For ln/log10/log2, it is intentionally ignored.
- Precision discrepancies: Small differences can occur due to floating-point arithmetic. If needed, round downstream using a rounding node.