pycodemath

text → [parser] → IR (expression tree) → [engine]     evaluate / simplify / solve
                                       → [generator]  IR → CSE → Python/NumPy source

pip install pycodemath            # core: sympy + numpy
pip install pycodemath[mcp]       # + MCP server for AI agents

pip install -e .[dev]             # editable + pytest + mypy

$ python -m pycodemath "diff sin(x)*x dx"
x*cos(x) + sin(x)

$ python -m pycodemath "integrate 2*x dx"
x**2

$ python -m pycodemath "solve x^2 - 4 for x"
-2, 2

$ python -m pycodemath "sin(x)^2 + cos(x)^2"
1

$ python -m pycodemath "eig [[2,1],[1,2]]"
3, 1

$ python -m pycodemath "solve_nd x^2+y^2-4; x-y for x,y at 1,1"
x = 1.4142135623746899, y = 1.4142135623746899

python -m pycodemath        # or just: pycodemath

pip install -e .[mcp]
claude mcp add pycodemath -- python -m pycodemath.cli.mcp_server

pip install pycodemath          # or: pip install -e .   (from a clone)
mkdir -p ~/.claude/skills/pycodemath

---
name: pycodemath
description: Compute math with the local Pycodemath engine (SymPy+NumPy) instead
  of in your head — derivatives, integrals, solving equations and systems
  (linear and nonlinear), determinants/inverses/eigenvalues, gradients/Jacobians/
  Hessians, function minima, ODEs, and optimized Python/NumPy code generation
  (CSE). Use whenever the user asks to compute or verify symbolic/numerical math,
  or to generate code from a formula.
---

# Pycodemath — local math engine

One command = one call (the package is pip-installed, so any working directory):

    python -m pycodemath "<command>"

Result goes to stdout (exit 0); errors to stderr (exit 1). Power notation: `^` or `**`.
On Windows consoles, set `PYTHONUTF8=1`.

## Commands

| Command | Example |
|---|---|
| `<expression>` — simplify | `python -m pycodemath "sin(x)^2 + cos(x)^2"` → `1` |
| `diff <expr> d<var>` — derivative | `"diff sin(x)*x dx"` → `x*cos(x) + sin(x)` |
| `integrate <expr> d<var>` — symbolic integral | `"integrate 2*x dx"` → `x**2` |
| `solve <expr> for <var>` — solve = 0 | `"solve x^2-4 for x"` → `-2, 2` |
| `code <expr>` — CSE-optimized NumPy code | `"code (sin(x)+cos(x))^2"` |
| `det / inv / transpose / eig <A>` | `"eig [[2,1],[1,2]]"` → `3, 1` |
| `solve_system <A> = <b>` — linear system | `"solve_system [[2,1],[1,3]] = [3,5]"` |
| `root <expr> for <var> at <x0>` — numeric root | `"root x^2-2 for x at 1"` |
| `min <expr> for <var> at <x0> [method newton|bfgs]` — 1D minimum | `"min (x-3)^2 for x at 0"` |
| `grad <expr> for <x,y,...>` — symbolic gradient | `"grad x^2*y for x,y"` |
| `solve_nd <f1>; <f2> for <x,y> at <x0,y0>` — nonlinear system | `"solve_nd x^2+y^2-4; x-y for x,y at 1,1"` |
| `min_nd <expr> for <x,y> at <x0,y0> [method newton|bfgs]` — N-D minimum | `"min_nd (1-x)^2+100*(y-x^2)^2 for x,y at -1.2,1 method bfgs"` |
| limits / series / sums / ODEs | `"limit sin(x)/x for x to 0"`, `"sum 1/k^2 for k from 1 to oo"` |

Type `help` in the REPL (`python -m pycodemath`) for the full command table.

## Rules

- **When to use:** the user wants a concrete math result (derivative, integral,
  equation, matrix, minimum, ODE) or optimized code from a formula. The engine is
  exact — trust its output over mental arithmetic.
- **When not to use:** trivial arithmetic or conceptual questions with no compute.
- A `error: ...` line on stderr (exit 1) usually means a typo in the command, a
  numerical method that did not converge, or no real solution — read the message,
  it is specific.

$ python -m pycodemath "limit (1+1/n)^n for n to oo"
E

$ python -m pycodemath "series exp(x) for x n 4"
x**3/6 + x**2/2 + x + 1

$ python -m pycodemath "sum k for k from 1 to n"
n**2/2 + n/2

$ python -m pycodemath "sum 1/k^2 for k from 1 to oo"
pi**2/6

$ python -m pycodemath "min_nd (1-x)^2 + 100*(y-x^2)^2 for x,y at -1.2,1 method bfgs"
x = 0.999999999999454, y = 0.9999999999989762

$ python -m pycodemath "ode_adaptive y*cos(t) for y(t) from 0 to 5 at 1 rtol 1e-8"
y(5) = 0.3833049965035854  (41 adaptive steps)

$ python -m pycodemath "odestiff_adaptive -1000*(y-cos(t)) for y(t) from 0 to 1 at 0"
y(1) = 0.5411432587540607  (adaptive BDF, 313 implicit steps)

$ python -m pycodemath "code (sin(x)+cos(x))^2 + (sin(x)+cos(x))^3"
import numpy as np


def f(x):
    """Pycodemath: f(x) — NumPy code."""
    _c0 = np.sin(x + (1/4)*np.pi)
    return 2*_c0**2*(np.sqrt(2)*_c0 + 1)

from pycodemath import parse, generate_ode_dense

art = generate_ode_dense(parse("y*cos(t)"), "t", "y")
sol = art(1.0, 0.0, 5.0, 1e-8)   # standalone DOPRI5, returns an interpolant
sol(2.5)                          # -> 1.8193369962907706
len(sol.ts)                       # -> 42 accepted nodes

from pycodemath import parse, solve_ode_events

ev = solve_ode_events(parse("cos(t)"), "t", 0.0, (0.0, 10.0), parse("y"), rtol=1e-8)
ev.event_times   # -> [3.141593, 6.283185, 9.424778]   (π, 2π, 3π)