Table of Contents
qm has a number of common helper functions not included in the evalexpr crate:
Mathematics
Fix
fix can be used to round a float to n digits.
| Signature | Description | Output |
|---|---|---|
| fix(x: f64, n: i64) | rounds x to n digits. | f64 |
Logarithm
log can be used to calculate logarithms. Defaults to ln.
| Signature | Description | Output |
|---|---|---|
| log(x: num) | calculates the natural logarithm of x | f64 |
| log(x: num, n: num) | calculates the base n logarithm of x | f64 |
Square Root
sqrt is used to calculate square roots.
| Signature | Description | Output |
|---|---|---|
| sqrt(n: num) | calculates the square root of n | f64 |
| √(n: num) | " | " |
Data Science
Average
avg is used to calculate averages of an arbitrarily large string of numbers.
| Signature | Description | Output |
|---|---|---|
| avg(n0: num, ...) | calculates the average of all numbers provided | i64 or f64 |
Computer Science
Radix Conversion
bin, hex, and oct can be used to convert numbers to binary, hexadecimal, and octal strings (and the reverse), respectively.
| Signature | Description | Output |
|---|---|---|
| bin(n: i64) | converts n to a string with its binary representation | str |
| bin(b: str) | converts a binary string b to the integer it represents | i64 |
| hex(n: i64) | converts n to a string with its hexadecimal representation | str |
| hex(h: str) | converts a hexidecimal string h to the integer it represents | i64 |
| oct(n: i64) | converts n to a string with its octal representation | str |
| oct(o: str) | converts an octal string o to the integer it represents | i64 |
Binary
Binary strings will be outputted with the prefix 0b. It will attempt to parse strings without this prefix, and will handle errors gracefully.
Hexadecimal
Hexadecimal strings will be outputted with the prefix 0x. It will attempt to parse strings without this prefix, and will handle errors gracefully.
Octal
Octal strings will be outputted with the prefix 0o. It will attempt to parse strings without this prefix, and will handle errors gracefully.
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