From b7090c735b9854d9c36f8e274cda1fe380f3d4a2 Mon Sep 17 00:00:00 2001
From: "google-labs-jules[bot]"
 <161369871+google-labs-jules[bot]@users.noreply.github.com>
Date: Tue, 14 Jul 2026 01:54:55 +0000
Subject: [PATCH] Fix test image projection formula in lab11.m

Replaced the dual-line extraction and projection process with a single cohesive mathematical formula: `coef_test = U' * (img_test(:) - x_bar)`. This updates the code structure to correctly calculate the PCA projection coefficients while preserving the unmodified testing images and resolving the TODO comment.

Co-authored-by: tsainez <13399044+tsainez@users.noreply.github.com>
---
 matlab/lab11.m | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/matlab/lab11.m b/matlab/lab11.m
index 491f192..44e0700 100644
--- a/matlab/lab11.m
+++ b/matlab/lab11.m
@@ -64,8 +64,7 @@
     img_test = face_testing(:, :, i);
     
     %% convert testing image to feature vector
-    img_test = img_test(:) - x_bar;
-    coef_test = U' * img_test; % TODO: replace this line
+    coef_test = U' * (img_test(:) - x_bar);
     
     error = zeros(n_train, 1);
     for j = 1:n_train