diff --git a/.gitignore b/.gitignore
index dbb1a6e..ed26911 100644
--- a/.gitignore
+++ b/.gitignore
@@ -32,6 +32,7 @@ C/rpn_function_hybrid.wasm
 calculator_frontend/public/wasm/*.js
 calculator_frontend/public/wasm/*.wasm
 !calculator_frontend/public/wasm/worker.js
+!calculator_frontend/public/wasm/worker_function.js
 
 # ==== CUDA Build Artifacts ====
 cuda/*.o
diff --git a/calculator_frontend/app/calculator/components/InputBar.tsx b/calculator_frontend/app/calculator/components/InputBar.tsx
index 113c097..c13905d 100644
--- a/calculator_frontend/app/calculator/components/InputBar.tsx
+++ b/calculator_frontend/app/calculator/components/InputBar.tsx
@@ -7,6 +7,11 @@ interface InputBarProps {
   onCalculate: () => void;
   onReset: () => void;
   onAbort: () => void;
+  onFileSelected: (file: File) => void;
+  onClearFile: () => void;
+  canCalculate: boolean;
+  fileName?: string;
+  filePointCount?: number;
 }
 
 export function InputBar({
@@ -15,7 +20,12 @@ export function InputBar({
   isCalculating,
   onCalculate,
   onReset,
-  onAbort
+  onAbort,
+  onFileSelected,
+  onClearFile,
+  canCalculate,
+  fileName,
+  filePointCount
 }: InputBarProps) {
   return (
     <div className="p-4 sm:p-6 bg-white dark:bg-[#1a1a1d] border-b border-gray-200 dark:border-[#2a2a2e]">
@@ -30,11 +40,42 @@ export function InputBar({
               className="w-full px-4 py-3 rounded-lg bg-gray-50 dark:bg-[#111113] border border-gray-200 dark:border-[#2a2a2e] text-gray-900 dark:text-white placeholder-gray-400 dark:placeholder-gray-600 focus:border-[#0066cc] focus:outline-none focus:ring-1 focus:ring-[#0066cc] font-mono text-lg"
               onKeyDown={(e) => e.key === 'Enter' && onCalculate()}
             />
+            {fileName && (
+              <div className="mt-2 text-xs text-gray-500 dark:text-gray-400 flex items-center gap-2">
+                <span className="truncate">Loaded data: {fileName}</span>
+                {typeof filePointCount === 'number' && (
+                  <span>({filePointCount} points)</span>
+                )}
+                <button
+                  type="button"
+                  onClick={onClearFile}
+                  className="ml-auto text-[#0066cc] hover:text-[#0052a3] dark:text-blue-300 dark:hover:text-blue-200"
+                >
+                  Clear
+                </button>
+              </div>
+            )}
           </div>
           <div className="flex gap-2">
+            <label className="px-4 py-3 bg-gray-200 dark:bg-[#2a2a2e] hover:bg-gray-300 dark:hover:bg-[#3a3a3e] text-gray-700 dark:text-gray-300 font-medium rounded-lg transition-colors flex items-center justify-center gap-2 cursor-pointer">
+              <input
+                type="file"
+                accept=".txt,.tsv,.dat,.csv"
+                className="hidden"
+                onChange={(e) => {
+                  const file = e.target.files?.[0];
+                  if (file) onFileSelected(file);
+                  e.target.value = '';
+                }}
+              />
+              <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M4 16v2a2 2 0 002 2h12a2 2 0 002-2v-2M7 10l5-5 5 5M12 5v12" />
+              </svg>
+              <span>Load Data</span>
+            </label>
             <button
               onClick={onCalculate}
-              disabled={!inputValue || isCalculating}
+              disabled={!canCalculate || isCalculating}
               className="flex-1 sm:flex-none px-6 py-3 bg-[#0066cc] hover:bg-[#0052a3] disabled:bg-gray-300 dark:disabled:bg-gray-700 text-white font-semibold rounded-lg transition-colors flex items-center justify-center gap-2 disabled:cursor-not-allowed"
             >
               {isCalculating ? (
diff --git a/calculator_frontend/app/calculator/page.tsx b/calculator_frontend/app/calculator/page.tsx
index efba408..b7794fb 100644
--- a/calculator_frontend/app/calculator/page.tsx
+++ b/calculator_frontend/app/calculator/page.tsx
@@ -40,6 +40,12 @@ export default function CalculatorPage() {
   const [errorMode, setErrorMode] = useState<ErrorMode>('automatic');
   const [manualError, setManualError] = useState('');
   const [computeMode, setComputeMode] = useState<ComputeMode>('auto');
+  const [functionData, setFunctionData] = useState<{
+    xValues: number[];
+    yValues: number[];
+    dyValues: number[];
+    filename: string;
+  } | null>(null);
   
   const workersRef = useRef<Worker[]>([]);
   const isAbortedRef = useRef(false);
@@ -176,8 +182,62 @@ export default function CalculatorPage() {
     setIsCalculating(false);
   };
 
+  const parseFunctionData = (content: string) => {
+    const xValues: number[] = [];
+    const yValues: number[] = [];
+    const dyValues: number[] = [];
+    const lines = content.split(/\r?\n/);
+
+    lines.forEach((line) => {
+      const trimmed = line.trim();
+      if (!trimmed || trimmed.startsWith('#')) return;
+      const parts = trimmed.split(/\s+/);
+      if (parts.length < 2) return;
+
+      const x = Number.parseFloat(parts[0]);
+      const y = Number.parseFloat(parts[1]);
+      if (Number.isNaN(x) || Number.isNaN(y)) return;
+
+      xValues.push(x);
+      yValues.push(y);
+
+      if (parts.length >= 3) {
+        const dy = Number.parseFloat(parts[2]);
+        dyValues.push(Number.isNaN(dy) ? 0 : dy);
+      } else {
+        dyValues.push(0);
+      }
+    });
+
+    return { xValues, yValues, dyValues };
+  };
+
+  const handleFileSelected = async (file: File) => {
+    try {
+      const content = await file.text();
+      const { xValues, yValues, dyValues } = parseFunctionData(content);
+      if (xValues.length === 0) {
+        console.warn('No valid data rows found in file.');
+        return;
+      }
+      setFunctionData({
+        xValues,
+        yValues,
+        dyValues,
+        filename: file.name
+      });
+    } catch (error) {
+      console.error('Failed to read file:', error);
+    }
+  };
+
+  const clearFunctionData = () => {
+    setFunctionData(null);
+  };
+
   const calculate = async () => {
-    if (!inputValue) return;
+    const usingFunctionData = Boolean(functionData && functionData.xValues.length > 0);
+    if (!inputValue && !usingFunctionData) return;
     
     setIsCalculating(true);
     setResults([]);
@@ -193,31 +253,37 @@ export default function CalculatorPage() {
       setElapsedTime(Date.now() - startTimeRef.current);
     }, 500);
     
-    // Calculate precision based on error mode
-    let deltaZNum: number;
-    const zNum = parseFloat(inputValue);
-    
-    if (errorMode === 'zero') {
-      deltaZNum = 0;
-    } else if (errorMode === 'manual' && manualError) {
-      deltaZNum = parseFloat(manualError) || 0;
+    let deltaZNum = 0;
+    let zNum = 0;
+    if (!usingFunctionData) {
+      // Calculate precision based on error mode
+      zNum = parseFloat(inputValue);
+
+      if (errorMode === 'zero') {
+        deltaZNum = 0;
+      } else if (errorMode === 'manual' && manualError) {
+        deltaZNum = parseFloat(manualError) || 0;
+      } else {
+        // automatic mode - use extractPrecision
+        const autoPrecision = extractPrecision(inputValue);
+        deltaZNum = parseFloat(autoPrecision.deltaZ || '0.5');
+      }
+
+      // Update precision display
+      const relDeltaZ = zNum !== 0 ? deltaZNum / Math.abs(zNum) : 0;
+      setPrecision({
+        z: inputValue,
+        deltaZ: deltaZNum === 0 ? '0' : deltaZNum.toExponential(2),
+        relDeltaZ: relDeltaZ === 0 ? '0' : relDeltaZ.toExponential(2)
+      });
     } else {
-      // automatic mode - use extractPrecision
-      const autoPrecision = extractPrecision(inputValue);
-      deltaZNum = parseFloat(autoPrecision.deltaZ || '0.5');
+      setPrecision({});
     }
-    
-    // Update precision display
-    const relDeltaZ = zNum !== 0 ? deltaZNum / Math.abs(zNum) : 0;
-    setPrecision({
-      z: inputValue,
-      deltaZ: deltaZNum === 0 ? '0' : deltaZNum.toExponential(2),
-      relDeltaZ: relDeltaZ === 0 ? '0' : relDeltaZ.toExponential(2)
-    });
 
     const shouldUseGpu =
-      (computeMode === 'gpu' && gpuAvailable) ||
-      (computeMode === 'auto' && gpuAvailable);
+      !usingFunctionData &&
+      ((computeMode === 'gpu' && gpuAvailable) ||
+        (computeMode === 'auto' && gpuAvailable));
 
     if (shouldUseGpu) {
       setActiveWorkers([]);
@@ -282,9 +348,11 @@ export default function CalculatorPage() {
     //const allComplete = new Promise<void>(resolve => { resolveAll = resolve; });
     //resolveAllRef.current = resolveAll;
     
+    const workerScript = usingFunctionData ? '/wasm/worker_function.js' : '/wasm/worker.js';
+
     for (let i = 0; i < effectiveThreads; i++) {
       //const worker = new Worker('/wasm/worker.js');
-      const worker = new Worker(withBasePath('/wasm/worker.js'));
+      const worker = new Worker(withBasePath(workerScript));
       const cpuId = i;
       
       const onComplete = () => {
@@ -306,15 +374,28 @@ export default function CalculatorPage() {
     
     // Start computation on each worker
     workers.forEach((worker, i) => {
-      worker.postMessage({
-        initDelay: 0,
-        z: parseFloat(inputValue),
-        inputPrecision: deltaZNum,
-        MinCodeLength: 1,
-        MaxCodeLength: searchDepth,
-        cpuId: i,
-        ncpus: effectiveThreads
-      });
+      if (usingFunctionData && functionData) {
+        worker.postMessage({
+          initDelay: 0,
+          xValues: functionData.xValues,
+          yValues: functionData.yValues,
+          dyValues: functionData.dyValues,
+          MinCodeLength: 1,
+          MaxCodeLength: searchDepth,
+          cpuId: i,
+          ncpus: effectiveThreads
+        });
+      } else {
+        worker.postMessage({
+          initDelay: 0,
+          z: parseFloat(inputValue),
+          inputPrecision: deltaZNum,
+          MinCodeLength: 1,
+          MaxCodeLength: searchDepth,
+          cpuId: i,
+          ncpus: effectiveThreads
+        });
+      }
     });
     
     // Wait for all workers to complete
@@ -354,6 +435,7 @@ export default function CalculatorPage() {
     setInputValue('');
     setResults([]);
     setPrecision({});
+    setFunctionData(null);
     setSortColumn(null);
     setSortDirection('asc');
     setFilters(defaultFilters);
@@ -403,6 +485,11 @@ export default function CalculatorPage() {
           onCalculate={calculate}
           onReset={handleReset}
           onAbort={handleAbort}
+          onFileSelected={handleFileSelected}
+          onClearFile={clearFunctionData}
+          canCalculate={Boolean(inputValue) || Boolean(functionData)}
+          fileName={functionData?.filename}
+          filePointCount={functionData?.xValues.length}
         />
 
         {/* Search Status */}
diff --git a/calculator_frontend/public/wasm/worker_function.js b/calculator_frontend/public/wasm/worker_function.js
new file mode 100644
index 0000000..278f168
--- /dev/null
+++ b/calculator_frontend/public/wasm/worker_function.js
@@ -0,0 +1,70 @@
+// Worker script for function recognition: worker_function.js
+importScripts('vsearch.js');
+
+let runtimeReady = false;
+const pendingMessages = [];
+
+Module.onRuntimeInitialized = () => {
+  runtimeReady = true;
+  postMessage({ type: 'ready' });
+  while (pendingMessages.length > 0) {
+    const message = pendingMessages.shift();
+    if (message) handleWork(message);
+  }
+};
+
+function toByteArray(values) {
+  return new Uint8Array(new Float64Array(values).buffer);
+}
+
+function doWork(initDelay, xValues, yValues, dyValues, MinCodeLength, MaxCodeLength, cpuId, ncpus) {
+  return new Promise(resolve => {
+    setTimeout(() => {
+      const xBytes = toByteArray(xValues);
+      const yBytes = toByteArray(yValues);
+      const dyBytes = toByteArray(dyValues);
+
+      const result = Module.ccall(
+        'search_function_wasm',
+        'string',
+        ['array', 'array', 'array', 'number', 'number', 'number', 'number', 'number'],
+        [
+          xBytes,
+          yBytes,
+          dyBytes,
+          xValues.length,
+          MinCodeLength,
+          MaxCodeLength,
+          cpuId,
+          ncpus
+        ]
+      );
+
+      resolve(JSON.parse(result));
+    }, initDelay);
+  });
+}
+
+const handleWork = async (e) => {
+  const { initDelay, xValues, yValues, dyValues, MinCodeLength, MaxCodeLength, cpuId, ncpus } = e.data;
+  console.log(
+    `Worker ${cpuId} of ${ncpus} starting function search with ${xValues.length} points, MinK=${MinCodeLength}, MaxK=${MaxCodeLength}`
+  );
+
+  const resultJSON = await doWork(initDelay, xValues, yValues, dyValues, MinCodeLength, MaxCodeLength, cpuId, ncpus);
+
+  console.log(`Worker ${cpuId} finished work with result:`, resultJSON);
+
+  postMessage({
+    cpuId,
+    ...resultJSON
+  });
+};
+
+onmessage = (e) => {
+  if (!runtimeReady) {
+    pendingMessages.push(e);
+    return;
+  }
+  handleWork(e);
+};