python script, curves to compare

Makefile

@@ -15,18 +15,17 @@ OBJS     := $(patsubst $(SRCDIR)/%.c,$(OBJDIR)/%.o,$(SRCS))
 # --------------------------------------------------
 # Phony targets
 # --------------------------------------------------
-.PHONY: all sparse clean
+.PHONY: all pagerank clean
 
-all: sparse
+all: pagerank
 
-sparse: $(OBJDIR)/sparse | $(OBJDIR)
+pagerank: $(OBJDIR)/pagerank | $(OBJDIR)
-	@echo "→ Running sparse"
+	@echo "→ Build complete: pagerank"
-	./$(OBJDIR)/sparse
 
 # --------------------------------------------------
 # Link
 # --------------------------------------------------
-$(OBJDIR)/sparse: $(OBJS) $(DATAPATH) | $(OBJDIR)
+$(OBJDIR)/pagerank: $(OBJS) $(DATAPATH) | $(OBJDIR)
 	@echo "→ Copying input data"
 	cp $(DATAPATH) $(OBJDIR)/input.mtx
 	@echo "→ Linking $@"

main.py

@@ -0,0 +1,108 @@
+import subprocess
+import re
+import numpy as np
+import matplotlib.pyplot as plt
+
+def run_pagerank(matrix_path, epsilon, alpha):
+    """
+    Execute pagerank binary with given parameters
+    Returns a dictionary with parsed output or None if execution fails.
+    """
+    cmd = [
+        "./out/pagerank",
+        "--matrix", matrix_path,
+        "--epsilon", str(epsilon),
+        "--alpha", str(alpha)
+    ]
+
+    try:
+        result = subprocess.run(cmd, capture_output=True, text=True, check=True)
+        output = result.stdout
+
+        data = {}
+        match = re.search(r"Read and convert matrix: (\d+\.\d+) seconds", output)
+        data["read_time"] = float(match.group(1)) if match else None
+
+        match = re.search(r"Pagerank: (\d+) Iterations", output)
+        data["pagerank_iterations"] = int(match.group(1)) if match else None
+
+        match = re.search(r"Pagerank: (\d+\.\d+) seconds", output)
+        data["pagerank_time"] = float(match.group(1)) if match else None
+
+        match = re.search(r"Gauss-Seidel: (\d+) Iterations", output)
+        data["gauss_seidel_iterations"] = int(match.group(1)) if match else None
+
+        match = re.search(r"Gauss-Seidel:: (\d+\.\d+) seconds", output)
+        data["gauss_seidel_time"] = float(match.group(1)) if match else None
+
+        match = re.search(r"Difference norm Pagerank and Gauss-Seidel: (\d+\.\d+)", output)
+        data["diff_norm"] = float(match.group(1)) if match else None
+
+        return data
+
+    except subprocess.CalledProcessError as e:
+        print(f"Error running command for alpha={alpha}: {e}")
+        return None
+    except (AttributeError, ValueError) as e:
+        print(f"Error parsing output for alpha={alpha}: {e}")
+        return None
+
+def main():
+    matrix_path = "./out/input.mtx"
+    epsilon = 1e-10
+    alpha_values = np.arange(0, 1, 0.1)
+
+    pagerank_iterations = []
+    gauss_seidel_iterations = []
+    pagerank_times = []
+    gauss_seidel_times = []
+    diff_norms = []
+
+    for alpha in alpha_values:
+        print(f"Running for alpha={alpha:.3f}")
+        data = run_pagerank(matrix_path, epsilon, alpha)
+        if data:
+            pagerank_iterations.append(data["pagerank_iterations"])
+            gauss_seidel_iterations.append(data["gauss_seidel_iterations"])
+            pagerank_times.append(data["pagerank_time"])
+            gauss_seidel_times.append(data["gauss_seidel_time"])
+            diff_norms.append(data["diff_norm"])
+        else:
+            print(f"Skipping alpha={alpha:.3f} due to error")
+            pagerank_iterations.append(None)
+            gauss_seidel_iterations.append(None)
+            pagerank_times.append(None)
+            gauss_seidel_times.append(None)
+            diff_norms.append(None)
+
+    # plots
+    fig, (ax1, ax2, ax3) = plt.subplots(3, 1, figsize=(10, 12), sharex=True)
+
+    # 1: Number of iterations
+    ax1.plot(alpha_values, pagerank_iterations, label="PageRank Iterations", color="blue")
+    ax1.plot(alpha_values, gauss_seidel_iterations, label="Gauss-Seidel Iterations", color="red")
+    ax1.set_ylabel("Number of Iterations")
+    ax1.set_title("Iterations vs. Alpha")
+    ax1.legend()
+    ax1.grid(True)
+
+    # 2: Execution time
+    ax2.plot(alpha_values, pagerank_times, label="PageRank Time", color="blue")
+    ax2.plot(alpha_values, gauss_seidel_times, label="Gauss-Seidel Time", color="red")
+    ax2.set_ylabel("Time (seconds)")
+    ax2.set_title("Execution Time vs. Alpha")
+    ax2.legend()
+    ax2.grid(True)
+
+    # 3: Difference norm
+    ax3.plot(alpha_values, diff_norms, label="Difference Norm", color="green")
+    ax3.set_xlabel("Alpha")
+    ax3.set_ylabel("Norm Difference")
+    ax3.set_title("Difference Norm between PageRank and Gauss-Seidel vs. Alpha")
+    ax3.legend()
+    ax3.grid(True)
+
+    plt.show()
+
+if __name__ == "__main__":
+    main()