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‎_sources/changelog.md.txt‎

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# Changelog
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## 0.5.0
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- Overhaul of the nonlinear programming interface and now PyOptInterface can solve nonlinear programming problems with COPT, Gurobi and IPOPT.
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- Use `model.add_linear_constraint(x+y, (1.0, 2.0))` to add two-sided linear constraints
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- Add `poi.ScalarAffineFunction.from_numpy` to create scalar affine functions from numpy arrays quickly
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## 0.4.1
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- Support writing solution files in HiGHS
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- Pass the names of variables and constraints to HiGHS

‎changelog.html‎

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<section class="tex2jax_ignore mathjax_ignore" id="changelog">
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<h1>Changelog<a class="headerlink" href="#changelog" title="Link to this heading"></a></h1>
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<section id="id1">
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<h2>0.4.1<a class="headerlink" href="#id1" title="Link to this heading"></a></h2>
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<h2>0.5.0<a class="headerlink" href="#id1" title="Link to this heading"></a></h2>
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<ul class="simple">
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<li><p>Overhaul of the nonlinear programming interface and now PyOptInterface can solve nonlinear programming problems with COPT, Gurobi and IPOPT.</p></li>
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<li><p>Use <code class="docutils literal notranslate"><span class="pre">model.add_linear_constraint(x+y,</span> <span class="pre">(1.0,</span> <span class="pre">2.0))</span></code> to add two-sided linear constraints</p></li>
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<li><p>Add <code class="docutils literal notranslate"><span class="pre">poi.ScalarAffineFunction.from_numpy</span></code> to create scalar affine functions from numpy arrays quickly</p></li>
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</ul>
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</section>
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<section id="id2">
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<h2>0.4.1<a class="headerlink" href="#id2" title="Link to this heading"></a></h2>
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<ul class="simple">
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<li><p>Support writing solution files in HiGHS</p></li>
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<li><p>Pass the names of variables and constraints to HiGHS</p></li>
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<li><p>Add <code class="docutils literal notranslate"><span class="pre">model.close()</span></code> and <code class="docutils literal notranslate"><span class="pre">env.close()</span></code> methods to allow users release the license of commercial solvers manually</p></li>
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<h2>0.4.0<a class="headerlink" href="#id3" title="Link to this heading"></a></h2>
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<li><p>Add <code class="docutils literal notranslate"><span class="pre">model.add_m_variables</span></code> and <code class="docutils literal notranslate"><span class="pre">model.add_m_linear_constraints</span></code> matrix modeling API</p></li>
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<li><p>Add <code class="docutils literal notranslate"><span class="pre">model.computeIIS</span></code> and IIS related attributes for constraint and variable</p></li>
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<li><p>Supports HiGHS 1.9.0 and Mosek 11</p></li>
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</ul>
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</section>
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<h2>0.3.0<a class="headerlink" href="#id3" title="Link to this heading"></a></h2>
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<h2>0.3.0<a class="headerlink" href="#id4" title="Link to this heading"></a></h2>
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<li><p>Add <code class="docutils literal notranslate"><span class="pre">model.set_variable_bounds(variable,</span> <span class="pre">lb,</span> <span class="pre">ub)</span></code> to make it easier to change variable bounds</p></li>
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<li><p>Introduce nonlinear programming support of Ipopt</p></li>
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<li><p>Support new versions of optimizers</p></li>
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<li><p>Various minor bug fixes</p></li>
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<h2>0.2.8<a class="headerlink" href="#id5" title="Link to this heading"></a></h2>
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<h2>0.2.2<a class="headerlink" href="#id11" title="Link to this heading"></a></h2>
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<div class="toc-tree">
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<ul>
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<li><a class="reference internal" href="#">Changelog</a><ul>
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<li><a class="reference internal" href="#id1">0.4.1</a></li>
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‎constraint.html‎

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No license found. Starting COPT with size limitations for non-commercial use
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‎examples/economic_dispatch.html‎

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‎examples/optimal_control_rocket.html‎

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‎examples/optimal_power_flow.html‎

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‎expression.html‎

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‎infeasibility.html‎

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2025-08-08 02:23:37 [INFO] empty environment variable: COPT_LICENSE_DIR
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<div class="output stream highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span>Constraint 1 IIS: True
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Constraint 2 IIS: True
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2025-08-08 09:46:29 [INFO] checks license for COPT v7.2.8 20250516
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2025-08-08 09:46:29 [WARN] no license files in current working folder: /home/runner/work/PyOptInterface/PyOptInterface/docs/source
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2025-08-08 09:46:29 [WARN] no license files in binary folder: /opt/hostedtoolcache/Python/3.12.11/x64/bin
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2025-08-08 09:46:29 [WARN] no license files in HOME folder: /home/runner/copt
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2025-08-08 09:46:29 [INFO] empty environment variable: COPT_LICENSE_DIR
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2025-08-08 09:46:29 [WARN] no license files in EV &#39;COPT_LICENSE_DIR&#39;:
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No license found. Starting COPT with size limitations for non-commercial use
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Please apply for a license from www.shanshu.ai/copt
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No license found. LP size is limited to 10000 variables and 10000 constraints
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</pre></div>
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</div>
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<div class="output stream highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span>No license found. LP size is limited to 10000 variables and 10000 constraints
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Please apply for a license from www.shanshu.ai/copt
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Model fingerprint: 43b22f9c
@@ -343,8 +346,6 @@ <h1>Infeasibility Analysis<a class="headerlink" href="#infeasibility-analysis" t
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IIS summary: 2 rows, 0 bounds of columns
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IIS computation finished (0.001s)
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Constraint 2 IIS: True
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</pre></div>
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</div>
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</div>

‎model.html‎

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@@ -422,10 +422,12 @@ <h2>Inspect and customize the model<a class="headerlink" href="#inspect-and-cust
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Bound [1e+00, 1e+00]
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RHS [1e+00, 1e+00]
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Iteration Objective NullspaceDim
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Objective value: 0.49999999999999994
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0 1 0 0.00s
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2 0.50000002 1 0.00s
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Model status : Optimal
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Objective value: 0.49999999999999994
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</pre></div>
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</div>
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<div class="output stream highlight-myst-ansi notranslate"><div class="highlight"><pre><span></span>Model status : Optimal
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QP ASM iterations: 2
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Objective value : 5.0000000000e-01
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P-D objective error : 2.4999999473e-08

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