IntersectMBO · Unisay · Jul 29, 2026 · Jul 29, 2026 · Jul 29, 2026 · Jul 29, 2026
diff --git a/doc/cost-models/README.md b/doc/cost-models/README.md
@@ -59,7 +59,7 @@ doc/cost-models/
 ## Data Sources
 
 - **Benchmark Data**: `plutus-core/cost-model/data/benching-conway.csv`
-- **Cost Models**: `plutus-core/cost-model/data/builtinCostModelC.json`
+- **Cost Models**: `plutus-core/cost-model/data/builtinCostModelE.json`
 
 Data is loaded dynamically from the Plutus repository using the browser's `fetch()` API.
 
@@ -164,7 +164,7 @@ No build process required - the workflow copies static files directly to `gh-pag
 
 **Model not found:**
 
-- Verify function name matches key in `builtinCostModelC.json`
+- Verify function name matches key in `builtinCostModelE.json`
 - Check console for detailed error messages
 
 **Plot not rendering:**

diff --git a/doc/cost-models/index.html b/doc/cost-models/index.html
@@ -20,6 +20,7 @@
       <li><a href="listtoarray/index.html">ListToArray</a></li>
       <li><a href="lengthofarray/index.html">LengthOfArray</a></li>
       <li><a href="indexarray/index.html">IndexArray</a></li>
+      <li><a href="multiindexarray/index.html">MultiIndexArray</a></li>
       <li><a href="indexbytestring/index.html">IndexByteString</a></li>
     </ul>
   </nav>
@@ -135,6 +136,16 @@ <h2>Available Visualizations</h2>
           </p>
         </li>
 
+        <li>
+          <a href="multiindexarray/index.html">MultiIndexArray</a>
+          <p class="description">
+            Looks up a list of indices in a Plutus array; linear in the number of indices,
+            independent of the array size.
+            (3D visualization: Haystack Size &times; Needles Size vs Time, plus per-index time
+            distribution histogram)
+          </p>
+        </li>
+
         <li>
           <a href="indexbytestring/index.html">IndexByteString</a>
           <p class="description">
@@ -157,7 +168,7 @@ <h2>Data Sources</h2>
         </li>
         <li>
           <strong>Cost Models:</strong>
-          <a href="https://github.com/IntersectMBO/plutus/blob/master/plutus-core/cost-model/data/builtinCostModelC.json" target="_blank">builtinCostModelC.json</a>
+          <a href="https://github.com/IntersectMBO/plutus/blob/master/plutus-core/cost-model/data/builtinCostModelE.json" target="_blank">builtinCostModelE.json</a>
         </li>
       </ul>
       <p>
@@ -239,7 +250,7 @@ <h3>Troubleshooting</h3>
         </li>
         <li>
           <strong>Model not found:</strong> Verify function name matches the key in
-          <code>builtinCostModelC.json</code>
+          <code>builtinCostModelE.json</code>
         </li>
         <li>
           <strong>Plot not rendering:</strong> Check Plotly errors in console;

diff --git a/doc/cost-models/indexarray/index.html b/doc/cost-models/indexarray/index.html
@@ -18,6 +18,7 @@
       <li><a href="../listtoarray/index.html">ListToArray</a></li>
       <li><a href="../lengthofarray/index.html">LengthOfArray</a></li>
       <li><a href="../indexarray/index.html" class="active">IndexArray</a></li>
+      <li><a href="../multiindexarray/index.html">MultiIndexArray</a></li>
       <li><a href="../indexbytestring/index.html">IndexByteString</a></li>
     </ul>
   </nav>
@@ -118,7 +119,7 @@ <h3>Plot Information</h3>
         <div class="info-section">
           <dt>Data sources:</dt>
           <dd><a href="https://github.com/IntersectMBO/plutus/blob/master/plutus-core/cost-model/data/benching-conway.csv" target="_blank">benching-conway.csv</a></dd>
-          <dd><a href="https://github.com/IntersectMBO/plutus/blob/master/plutus-core/cost-model/data/builtinCostModelC.json" target="_blank">builtinCostModelC.json</a></dd>
+          <dd><a href="https://github.com/IntersectMBO/plutus/blob/master/plutus-core/cost-model/data/builtinCostModelE.json" target="_blank">builtinCostModelE.json</a></dd>
         </div>
       </div>
     </div>

diff --git a/doc/cost-models/indexarray/plot.js b/doc/cost-models/indexarray/plot.js
@@ -35,7 +35,7 @@ function generateUrlFromBranch(branch) {
 function getFileUrls(baseUrl) {
   return {
     csv: `${baseUrl}/benching-conway.csv`,
-    json: `${baseUrl}/builtinCostModelC.json`
+    json: `${baseUrl}/builtinCostModelE.json`
   };
 }
 

diff --git a/doc/cost-models/indexbytestring/index.html b/doc/cost-models/indexbytestring/index.html
@@ -21,6 +21,7 @@
       <li><a href="../listtoarray/index.html">ListToArray</a></li>
       <li><a href="../lengthofarray/index.html">LengthOfArray</a></li>
       <li><a href="../indexarray/index.html">IndexArray</a></li>
+      <li><a href="../multiindexarray/index.html">MultiIndexArray</a></li>
       <li><a href="../indexbytestring/index.html" class="active">IndexByteString</a></li>
     </ul>
   </nav>
@@ -121,7 +122,7 @@ <h3>Plot Information</h3>
         <div class="info-section">
           <dt>Data sources:</dt>
           <dd><a href="https://github.com/IntersectMBO/plutus/blob/master/plutus-core/cost-model/data/benching-conway.csv" target="_blank">benching-conway.csv</a></dd>
-          <dd><a href="https://github.com/IntersectMBO/plutus/blob/master/plutus-core/cost-model/data/builtinCostModelC.json" target="_blank">builtinCostModelC.json</a></dd>
+          <dd><a href="https://github.com/IntersectMBO/plutus/blob/master/plutus-core/cost-model/data/builtinCostModelE.json" target="_blank">builtinCostModelE.json</a></dd>
         </div>
       </div>
     </div>

diff --git a/doc/cost-models/indexbytestring/plot.js b/doc/cost-models/indexbytestring/plot.js
@@ -35,7 +35,7 @@ function generateUrlFromBranch(branch) {
 function getFileUrls(baseUrl) {
   return {
     csv: `${baseUrl}/benching-conway.csv`,
-    json: `${baseUrl}/builtinCostModelC.json`
+    json: `${baseUrl}/builtinCostModelE.json`
   };
 }
 

diff --git a/doc/cost-models/insertcoin/index.html b/doc/cost-models/insertcoin/index.html
@@ -21,6 +21,7 @@
       <li><a href="../listtoarray/index.html">ListToArray</a></li>
       <li><a href="../lengthofarray/index.html">LengthOfArray</a></li>
       <li><a href="../indexarray/index.html">IndexArray</a></li>
+      <li><a href="../multiindexarray/index.html">MultiIndexArray</a></li>
       <li><a href="../indexbytestring/index.html">IndexByteString</a></li>
     </ul>
   </nav>
@@ -111,7 +112,7 @@ <h3>Plot Information</h3>
         <div class="info-section">
           <dt>Data sources:</dt>
           <dd><a href="https://github.com/IntersectMBO/plutus/blob/master/plutus-core/cost-model/data/benching-conway.csv" target="_blank">benching-conway.csv</a></dd>
-          <dd><a href="https://github.com/IntersectMBO/plutus/blob/master/plutus-core/cost-model/data/builtinCostModelC.json" target="_blank">builtinCostModelC.json</a></dd>
+          <dd><a href="https://github.com/IntersectMBO/plutus/blob/master/plutus-core/cost-model/data/builtinCostModelE.json" target="_blank">builtinCostModelE.json</a></dd>
         </div>
       </div>
     </div>

diff --git a/doc/cost-models/insertcoin/plot.js b/doc/cost-models/insertcoin/plot.js
@@ -35,7 +35,7 @@ function generateUrlFromBranch(branch) {
 function getFileUrls(baseUrl) {
   return {
     csv: `${baseUrl}/benching-conway.csv`,
-    json: `${baseUrl}/builtinCostModelC.json`
+    json: `${baseUrl}/builtinCostModelE.json`
   };
 }
 

diff --git a/doc/cost-models/lengthofarray/index.html b/doc/cost-models/lengthofarray/index.html
@@ -18,6 +18,7 @@
       <li><a href="../listtoarray/index.html">ListToArray</a></li>
       <li><a href="../lengthofarray/index.html" class="active">LengthOfArray</a></li>
       <li><a href="../indexarray/index.html">IndexArray</a></li>
+      <li><a href="../multiindexarray/index.html">MultiIndexArray</a></li>
       <li><a href="../indexbytestring/index.html">IndexByteString</a></li>
     </ul>
   </nav>
@@ -118,7 +119,7 @@ <h3>Plot Information</h3>
         <div class="info-section">
           <dt>Data sources:</dt>
           <dd><a href="https://github.com/IntersectMBO/plutus/blob/master/plutus-core/cost-model/data/benching-conway.csv" target="_blank">benching-conway.csv</a></dd>
-          <dd><a href="https://github.com/IntersectMBO/plutus/blob/master/plutus-core/cost-model/data/builtinCostModelC.json" target="_blank">builtinCostModelC.json</a></dd>
+          <dd><a href="https://github.com/IntersectMBO/plutus/blob/master/plutus-core/cost-model/data/builtinCostModelE.json" target="_blank">builtinCostModelE.json</a></dd>
         </div>
       </div>
     </div>

diff --git a/doc/cost-models/lengthofarray/plot.js b/doc/cost-models/lengthofarray/plot.js
@@ -35,7 +35,7 @@ function generateUrlFromBranch(branch) {
 function getFileUrls(baseUrl) {
   return {
     csv: `${baseUrl}/benching-conway.csv`,
-    json: `${baseUrl}/builtinCostModelC.json`
+    json: `${baseUrl}/builtinCostModelE.json`
   };
 }
 

diff --git a/doc/cost-models/listtoarray/index.html b/doc/cost-models/listtoarray/index.html
@@ -18,6 +18,7 @@
       <li><a href="../listtoarray/index.html" class="active">ListToArray</a></li>
       <li><a href="../lengthofarray/index.html">LengthOfArray</a></li>
       <li><a href="../indexarray/index.html">IndexArray</a></li>
+      <li><a href="../multiindexarray/index.html">MultiIndexArray</a></li>
       <li><a href="../indexbytestring/index.html">IndexByteString</a></li>
     </ul>
   </nav>
@@ -118,7 +119,7 @@ <h3>Plot Information</h3>
         <div class="info-section">
           <dt>Data sources:</dt>
           <dd><a href="https://github.com/IntersectMBO/plutus/blob/master/plutus-core/cost-model/data/benching-conway.csv" target="_blank">benching-conway.csv</a></dd>
-          <dd><a href="https://github.com/IntersectMBO/plutus/blob/master/plutus-core/cost-model/data/builtinCostModelC.json" target="_blank">builtinCostModelC.json</a></dd>
+          <dd><a href="https://github.com/IntersectMBO/plutus/blob/master/plutus-core/cost-model/data/builtinCostModelE.json" target="_blank">builtinCostModelE.json</a></dd>
         </div>
       </div>
     </div>

diff --git a/doc/cost-models/listtoarray/plot.js b/doc/cost-models/listtoarray/plot.js
@@ -35,7 +35,7 @@ function generateUrlFromBranch(branch) {
 function getFileUrls(baseUrl) {
   return {
     csv: `${baseUrl}/benching-conway.csv`,
-    json: `${baseUrl}/builtinCostModelC.json`
+    json: `${baseUrl}/builtinCostModelE.json`
   };
 }
 

diff --git a/doc/cost-models/lookupcoin/index.html b/doc/cost-models/lookupcoin/index.html
@@ -18,6 +18,7 @@
       <li><a href="../listtoarray/index.html">ListToArray</a></li>
       <li><a href="../lengthofarray/index.html">LengthOfArray</a></li>
       <li><a href="../indexarray/index.html">IndexArray</a></li>
+      <li><a href="../multiindexarray/index.html">MultiIndexArray</a></li>
       <li><a href="../indexbytestring/index.html">IndexByteString</a></li>
     </ul>
   </nav>
@@ -118,7 +119,7 @@ <h3>Plot Information</h3>
         <div class="info-section">
           <dt>Data sources:</dt>
           <dd><a href="https://github.com/IntersectMBO/plutus/blob/master/plutus-core/cost-model/data/benching-conway.csv" target="_blank">benching-conway.csv</a></dd>
-          <dd><a href="https://github.com/IntersectMBO/plutus/blob/master/plutus-core/cost-model/data/builtinCostModelC.json" target="_blank">builtinCostModelC.json</a></dd>
+          <dd><a href="https://github.com/IntersectMBO/plutus/blob/master/plutus-core/cost-model/data/builtinCostModelE.json" target="_blank">builtinCostModelE.json</a></dd>
         </div>
       </div>
     </div>

diff --git a/doc/cost-models/lookupcoin/plot.js b/doc/cost-models/lookupcoin/plot.js
@@ -35,7 +35,7 @@ function generateUrlFromBranch(branch) {
 function getFileUrls(baseUrl) {
   return {
     csv: `${baseUrl}/benching-conway.csv`,
-    json: `${baseUrl}/builtinCostModelC.json`
+    json: `${baseUrl}/builtinCostModelE.json`
   };
 }
 

diff --git a/doc/cost-models/multiindexarray/index.html b/doc/cost-models/multiindexarray/index.html
@@ -0,0 +1,166 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>MultiIndexArray - Plutus Cost Model Visualization</title>
+  <link rel="stylesheet" href="../shared/styles.css">
+  <script src="https://cdn.plot.ly/plotly-2.27.0.min.js"></script>
+</head>
+<body>
+  <nav>
+    <ul>
+      <li><a href="../index.html">Home</a></li>
+      <li><a href="../valuedata/index.html">ValueData</a></li>
+      <li><a href="../unvaluedata/index.html">UnValueData</a></li>
+      <li><a href="../valuecontains/index.html">ValueContains</a></li>
+      <li><a href="../lookupcoin/index.html">LookupCoin</a></li>
+      <li><a href="../insertcoin/index.html">InsertCoin</a></li>
+      <li><a href="../unionvalue/index.html">UnionValue</a></li>
+      <li><a href="../scalevalue/index.html">ScaleValue</a></li>
+      <li><a href="../listtoarray/index.html">ListToArray</a></li>
+      <li><a href="../lengthofarray/index.html">LengthOfArray</a></li>
+      <li><a href="../indexarray/index.html">IndexArray</a></li>
+      <li><a href="../multiindexarray/index.html" class="active">MultiIndexArray</a></li>
+      <li><a href="../indexbytestring/index.html">IndexByteString</a></li>
+    </ul>
+  </nav>
+
+  <div class="container">
+    <h1>MultiIndexArray Cost Model Visualization</h1>
+    <p>
+      Interactive visualization of benchmark data and fitted cost model for the <code>MultiIndexArray</code> builtin function.
+      This function looks up a list of indices (needles) in a Plutus array (haystack); the cost is linear in the
+      number of indices and independent of the array size, so the model plane in the 3D view is flat along the
+      haystack axis. The number of indices is limited, because beyond that limit the execution time is not
+      predictable from the index count alone; the histogram below shows the per-index time distribution.
+    </p>
+
+    <div class="controls" id="data-source-controls">
+      <h3 id="data-source-toggle">Data Source Configuration</h3>
+      <div class="controls-content">
+        <div class="control-group-vertical">
+          <label for="branch-name">Branch name:</label>
+          <div class="branch-input-row">
+            <input type="text" id="branch-name" placeholder="master">
+            <button id="copy-link" title="Copy shareable link">Copy Link</button>
+          </div>
+        </div>
+        <div class="control-group-vertical">
+          <label for="csv-url">CSV file URL:</label>
+          <input type="text" id="csv-url" style="width: 100%; font-family: monospace;">
+        </div>
+        <div class="control-group-vertical">
+          <label for="json-url">JSON file URL:</label>
+          <input type="text" id="json-url" style="width: 100%; font-family: monospace;">
+        </div>
+        <div class="control-group">
+          <button id="reload-data">Load Data</button>
+        </div>
+      </div>
+    </div>
+
+    <div class="controls" id="plot-controls">
+      <h3 id="plot-controls-toggle">Plot Controls</h3>
+      <div class="controls-content">
+        <div class="control-group">
+          <input type="checkbox" id="show-model" checked>
+          <label for="show-model">Show model predictions</label>
+        </div>
+        <div class="control-group">
+          <label for="z-axis-mode">Z-axis range:</label>
+          <select id="z-axis-mode">
+            <option value="zero">Start from 0</option>
+            <option value="auto">Auto-scale from min</option>
+          </select>
+        </div>
+        <div class="control-group">
+          <label for="hist-threshold">Histogram: min index count:</label>
+          <select id="hist-threshold">
+            <option value="1000">1000</option>
+            <option value="2000" selected>2000</option>
+            <option value="3000">3000</option>
+          </select>
+        </div>
+      </div>
+    </div>
+
+    <div class="plot-wrapper">
+      <div id="plot-container">
+        <div class="loading">Loading data and generating plot...</div>
+      </div>
+
+      <div class="info-panel">
+        <h3>Plot Information</h3>
+
+        <div class="info-section">
+          <dl>
+            <dt>X-axis:</dt>
+            <dd id="info-x-axis">Haystack size (array length, log scale)</dd>
+
+            <dt>Y-axis:</dt>
+            <dd id="info-y-axis">Needles size (length of the index list)</dd>
+
+            <dt>Z-axis:</dt>
+            <dd id="info-z-axis">Time (nanoseconds)</dd>
+
+            <dt>Description:</dt>
+            <dd id="info-description">Each point is one benchmark. The model plane is flat along the
+              haystack axis and slopes along the needles axis.</dd>
+          </dl>
+        </div>
+
+        <div class="info-section">
+          <dt>Cost Model Type:</dt>
+          <dd id="info-model-type">Loading...</dd>
+
+          <dt>Model Formula (net):</dt>
+          <dd class="formula" id="info-model-formula">Loading...</dd>
+
+          <dt>Overhead:</dt>
+          <dd id="info-overhead">Loading...</dd>
+        </div>
+
+        <div class="info-section">
+          <dl>
+            <dt>Data points:</dt>
+            <dd id="info-data-points">-</dd>
+
+            <dt>Index count range:</dt>
+            <dd id="info-x-range">-</dd>
+
+            <dt>Array size range:</dt>
+            <dd id="info-array-range">-</dd>
+
+            <dt>Time range:</dt>
+            <dd id="info-time-range">-</dd>
+          </dl>
+        </div>
+
+        <div class="info-section">
+          <dt>Data sources:</dt>
+          <dd><a href="https://github.com/IntersectMBO/plutus/blob/master/plutus-core/cost-model/data/benching-conway.csv" target="_blank">benching-conway.csv</a></dd>
+          <dd><a href="https://github.com/IntersectMBO/plutus/blob/master/plutus-core/cost-model/data/builtinCostModelE.json" target="_blank">builtinCostModelE.json</a>
+            (PlutusV3 from PV&nbsp;11 / vanRossem)</dd>
+        </div>
+      </div>
+    </div>
+
+    <h2>Per-index time distribution</h2>
+    <p>
+      Net time per index, <code>(t &minus; overhead) / indexCount</code>, for benchmarks with at least the
+      selected number of indices. The dashed line marks the net slope of the fitted model.
+    </p>
+    <div id="hist-container">
+      <div class="loading">Loading...</div>
+    </div>
+  </div>
+
+  <footer>
+    <p>Plutus Cost Model Visualization | <a href="https://github.com/IntersectMBO/plutus" target="_blank">Plutus Repository</a></p>
+  </footer>
+
+  <script src="../shared/utils.js"></script>
+  <script src="plot.js"></script>
+</body>
+</html>