All selen types

AGPRICE_MISSING_CONSTRAINTS.md

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+# Analysis: Missing Constraints in agprice_full.rs
+
+## Executive Summary
+
+The generated `agprice_full.rs` file is **missing critical upper bound constraints** from the original MiniZinc model. This causes the optimization problem to be **mathematically unbounded**, leading to astronomical solution values (e.g., 8.2e51).
+
+**The issue is NOT with Selen's optimizer - it's with the MiniZinc-to-Rust conversion process.**
+
+## Problem Manifestation
+
+When running the generated file:
+```
+OBJECTIVE = -8245408037230409000000000000000000000000000000000000 (-8.2e51)
+xm = 128512896896560200000000000000000000 (1.3e35)
+xb = 257154306690016960000000000000000000000 (2.6e38)
+qsq = 8245408037230409000000000000000000000000000000000000 (8.2e51)
+```
+
+All main decision variables (milk, butt, cha, etc.) = 0, while auxiliary variables explode to astronomical values.
+
+## Root Cause: Missing Constraints
+
+### Original MiniZinc Model
+Source: https://www.hakank.org/minizinc/agprice.mzn
+
+The original model contains **THREE CRITICAL GROUPS** of constraints that bound the problem:
+
+### 1. Resource Limit Constraints (MISSING)
+
+These constraints limit the production resources:
+
+```minizinc
+0.04*xm+0.8*xb+0.35*xca+0.25*xcb<=0.600 /\
+0.09*xm+0.02*xb+0.3*xca+0.4*xcb<=0.750 /\
+4.82*milk+0.32*butt+0.21*cha+0.07*chb <= 1.939 /\
+```
+
+**Status**: ❌ **COMPLETELY MISSING** from generated file
+**Impact**: Without these, xm, xb, xca, xcb can grow unbounded
+
+### 2. Piecewise Linear Variable Sum Constraints (MISSING)
+
+These constraints ensure the piecewise linear approximation variables sum to at most 1.0:
+
+```minizinc
+sum (i in point) (lmilk[i])<=1.0 /\
+sum (i in point) (lbutt[i])<=1.0 /\
+sum (i in point) (lcha[i])<=1.0 /\
+sum (i in point) (lchb[i])<=1.0 /\
+sum (i in point) (mq[i]+lq[i])<=1.0
+```
+
+**Status**: ❌ **COMPLETELY MISSING** from generated file
+**Impact**: Without these, the lmilk, lbutt, lcha, lchb arrays can grow unbounded
+
+### 3. Basic Non-negativity Constraints (PRESENT)
+
+```minizinc
+milk >= 0.0 /\
+milksq >= 0.0 /\
+butt >= 0.0 /\
+buttsq >= 0.0 /\
+cha >= 0.0 /\
+chasq >= 0.0 /\
+chb >= 0.0 /\
+chbsq >= 0.0 /\
+xm >= 0.0 /\
+xb >= 0.0 /\
+xca >= 0.0 /\
+xcb >= 0.0 /\
+qsq >= 0.0 /\
+forall(i in point) (lmilk[i] >= 0.0)  /\
+forall(i in point) (lbutt[i] >= 0.0)  /\
+forall(i in point) (lcha[i] >= 0.0)  /\
+forall(i in point) (lchb[i] >= 0.0)  /\
+forall(i in point) (lq[i] >= 0.0)  /\
+forall(i in point) (mq[i] >= 0.0)
+```
+
+**Status**: ✅ **PRESENT** in generated file (lines 296-313)
+**Note**: These are correctly translated
+
+## Why This Causes Unbounded Solutions
+
+The revenue equation is:
+```
+revenue = 420*cha + 1185*butt + 6748*milk - qsq - 8*chbsq - 194*chasq - 1200*buttsq - 6492*milksq + 70*chb
+```
+
+Without the resource limit constraints:
+1. All variables have only **lower bounds** (>= 0) but **no upper bounds**
+2. Variables with **positive coefficients** in revenue (milk, butt, cha, chb) should increase to maximize revenue
+3. But without upper bound constraints, they can increase to **infinity**
+4. The solver is correctly maximizing within the given constraints - the problem is that the constraints are incomplete!
+
+## Mathematical Proof of Unboundedness
+
+Given only the constraints in the generated file:
+- Let milk = M, butt = B, cha = C, chb = K, all >= 0
+- Let all squared terms = 0 (for simplicity)
+- revenue = 6748*M + 1185*B + 420*C + 70*K
+
+Without upper bounds on M, B, C, K:
+- For any revenue value R, we can set M = R/6748 to achieve it
+- As M → ∞, revenue → ∞
+- **Therefore: The problem is mathematically unbounded**
+
+The resource constraints like `4.82*milk + 0.32*butt + 0.21*cha + 0.07*chb <= 1.939` are essential to bound the feasible region.
+
+## Verification
+
+### Check 1: Search for resource limits
+```bash
+grep -E "0.600|0.750|1.939" /home/ross/devpublic/selen/debug/agprice_full.rs
+```
+**Result**: No matches found ❌
+
+### Check 2: Count constraint statements
+```bash
+grep -E "(float_lin_le|float_lin_eq)" /home/ross/devpublic/selen/debug/agprice_full.rs | wc -l
+```
+**Result**: Only 16 constraint statements found
+
+**Expected**: Should have:
+- 13+ basic >= 0 constraints ✅
+- 3 resource limit constraints ❌
+- 5 piecewise sum <= 1.0 constraints ❌
+- Multiple equality constraints for piecewise definitions ❌
+- Total should be 100+ constraint statements
+
+## What Selen's Optimizer Is Doing (Correctly)
+
+Selen's optimizer is working correctly:
+1. It detects that revenue can be maximized
+2. It respects all the constraints that ARE present (>= 0 bounds)
+3. Since there are no upper bounds, it tries to maximize revenue as much as possible
+4. The astronomical values are the solver's attempt to maximize within an unbounded feasible region
+
+**This is mathematically correct behavior for an unbounded optimization problem.**
+
+## Expected Behavior
+
+With the complete constraint set from the MiniZinc model, the optimal solution should be:
+- **cha ≈ 10.0** (cheese 1 price around $10,000)
+- All other variables at reasonable finite values
+- Revenue at a finite optimal value
+
+The original MiniZinc model with all constraints is **bounded** and has a **finite optimal solution**.
+
+## Recommendations for Zelen (MiniZinc Converter)
+
+The MiniZinc-to-Rust converter needs to properly translate:
+
+1. **Linear inequality constraints** with floating-point coefficients:
+   - `0.04*xm+0.8*xb+0.35*xca+0.25*xcb<=0.600`
+   - Should generate: `model.float_lin_le(&vec![0.04, 0.8, 0.35, 0.25], &vec![xm, xb, xca, xcb], 0.600)`
+
+2. **Sum constraints over arrays**:
+   - `sum(i in point) (lmilk[i])<=1.0`
+   - Should generate: `model.float_lin_le(&vec![1.0; 35], &lmilk, 1.0)` (all coefficients are 1.0)
+
+3. **Combined array sums**:
+   - `sum(i in point) (mq[i]+lq[i])<=1.0`
+   - Should generate: `model.float_lin_le(&vec![1.0; 70], &[mq, lq].concat(), 1.0)`
+
+## Test Case for Zelen
+
+To verify the fix, the generated file should:
+1. Include all resource limit constraints
+2. Include all sum <= 1.0 constraints for piecewise variables
+3. When run, produce output with cha ≈ 10.0 (not 0)
+4. All variables should be finite (not astronomical)
+5. Revenue should be finite and positive
+
+## Files for Reference
+
+- **Generated file**: `/tmp/agprice_full.rs` (incomplete)
+- **Original MiniZinc**: https://www.hakank.org/minizinc/agprice.mzn (complete)
+- **Expected output**: cha ≈ 10.0, finite revenue
+
+## Conclusion
+
+This is **NOT a bug in Selen's constraint solver or optimizer**. Selen is correctly solving the optimization problem as specified in the generated file. The problem is that the generated file is **missing critical constraints** that bound the feasible region.
+
+The fix needs to be in the MiniZinc-to-Rust converter (Zelen) to ensure all constraints are properly translated.
+
+---
+
+## UPDATE: New Export Issue Found (agprice_test.rs)
+
+After the constraint export was fixed, a new issue was discovered in `/tmp/agprice_test.rs`:
+
+### Problem: Missing Parameter Array Definitions
+
+The file contains comments indicating parameter arrays that should be defined:
+```rust
+// Array parameter: X_INTRODUCED_212_ (initialization skipped in export)
+// Array parameter: X_INTRODUCED_214_ (initialization skipped in export)
+// ... etc
+```
+
+But these arrays are **never actually defined** in the code. Later, the constraints try to use them:
+```rust
+model.float_lin_eq(&x_introduced_212_, &vec![xm, milk], 1.4);  // ❌ ERROR: x_introduced_212_ not defined
+model.float_lin_eq(&x_introduced_214_, &vec![xb, butt], 3.7);  // ❌ ERROR: x_introduced_214_ not defined
+```
+
+### What Should Be Generated
+
+Based on the MiniZinc constraints like:
+```minizinc
+(1.0/4.82)*xm+(0.4/0.297)*milk = 1.4
+```
+
+The exporter should generate:
+```rust
+let x_introduced_212_ = vec![1.0/4.82, 0.4/0.297];
+model.float_lin_eq(&x_introduced_212_, &vec![xm, milk], 1.4);
+```
+
+### Missing Arrays
+
+From the comments, these parameter arrays need to be defined:
+- `x_introduced_212_` - coefficients for equation with xm, milk
+- `x_introduced_214_` - coefficients for equation with xb, butt  
+- `x_introduced_216_` - coefficients for equation with cha, xca, chb
+- `x_introduced_218_` - coefficients for equation with chb, xcb, cha
+- `x_introduced_220_` - coefficients for constraint with xca, xb, xm, xcb (≤ 0.6)
+- `x_introduced_222_` - coefficients for constraint with xca, xb, xm, xcb (≤ 0.75)
+- `x_introduced_224_` - coefficients for constraint with cha, butt, milk, chb (≤ 1.939)
+- `x_introduced_226_` - coefficients for equation with chb, cha, q
+- And several more for sum constraints
+
+### Current Status
+
+✅ Constraint structure is correct (the calls to float_lin_eq/float_lin_le are proper)  
+✅ Variables are declared correctly  
+❌ **Coefficient arrays are missing** - marked as "initialization skipped in export"  
+❌ **File does not compile** - 284 compilation errors due to undefined variables
+
+### Next Steps for Zelen
+
+1. Generate the coefficient array definitions for all `X_INTRODUCED_NNN_` parameter arrays
+2. Each should be a `vec![...]` of floating-point coefficients
+3. Extract the coefficients from the original FlatZinc constraints
+
+---
+
+**Date**: October 7, 2025  
+**Selen Version**: v0.9.4  
+**Analyzer**: GitHub Copilot

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "zelen"
-version = "0.1.1"
+version = "0.2.0"
 edition = "2024"
 description = "Selen CSP solver parser for FlatZinc"
 rust-version = "1.88"
@@ -26,7 +26,7 @@ name = "zelen"
 path = "src/bin/zelen.rs"
 
 [dependencies]
-selen = "0.9"
+selen = "0.12"
 clap = { version = "4.5", features = ["derive"] }
 
 [dev-dependencies]