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A precise number generator for creating random or seeded sequences within specified ranges, suitable for testing, simulations, and data generation.

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About This Tool

This tool generates numeric sequences from user-controlled parameters. Users specify a range, the number of values, the data type (integer or decimal), and the method of generation. It supports both random sampling and seeded reproducibility. This is useful for QA data sets, algorithm testing, simulations, and teaching exercises where controlled numeric data is required. The core value lies in predictability when a seed is provided and flexibility when a range or distribution is adjusted.
Under the hood, the tool implements a RNG workflow with options for uniform and normal distributions. For uniform, values are drawn evenly across the specified range. For normal, the Box-Muller transform derives normally distributed values around a user-defined mean and standard deviation. Decimal precision is controlled via decimal_places, and leading zeros can be added by formatting. If duplicates are disallowed, the tool checks feasible unique counts given the range and precision and raises an error if impossible.
Typical users include developers generating test datasets, data scientists simulating sensor streams, educators creating example problems, and product teams validating performance under randomized inputs. Unique differentiators include deterministic seeding, multiple distribution types, explicit formatting controls, and ready export options. Use cases span quick unit tests, stress testing with diverse numeric inputs, and reproducible benchmarks across environments.

How to Use

  1. Set min, max, count, data_type, distribution, optional seed, decimal_places, and allow_duplicates.
  2. Choose distribution type: Uniform or Normal; provide mean and stdev if Normal.
  3. Run generation to produce the numeric sequence.
  4. Review the resulting list and formatting; adjust decimal places if needed.
  5. Export results as CSV or JSON or copy to clipboard.
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Frequently Asked Questions

Find Quick Answers

Is the sequence deterministic when a seed is provided?
Yes. Providing a numeric seed initializes a pseudo-random generator so the same inputs produce the same sequence across runs, enabling reproducible tests and experiments.
Can I generate decimal numbers and control precision?
Yes. Set data_type to decimal and specify decimal_places. The tool rounds values to the requested precision and formats outputs accordingly, regardless of distribution type.
What happens if duplicates are not allowed and the range is too small?
The tool detects infeasible configurations (too few unique values for the given precision and count) and returns an INVALID_INPUT or LIMIT_EXCEEDED error, prompting input adjustments.
What formats can I export?
Outputs can be exported as CSV lines or a JSON array of numbers. You can also copy the results to the clipboard for quick integration into pipelines.

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