From 41983ed1c92e953f4672d1cca802ebf872562d6b Mon Sep 17 00:00:00 2001
From: Kanishk Jain <kanishkbjain@gmail.com>
Date: Wed, 13 May 2020 18:24:11 -0500
Subject: [PATCH] Update returnCorrectSigma_sparse.m

If sigma is inf or nan, the script will go in an infinite loop. Added a check to see if starting sigma is well defined.
---
 t_sne/returnCorrectSigma_sparse.m | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/t_sne/returnCorrectSigma_sparse.m b/t_sne/returnCorrectSigma_sparse.m
index 4396c08..29fee51 100644
--- a/t_sne/returnCorrectSigma_sparse.m
+++ b/t_sne/returnCorrectSigma_sparse.m
@@ -30,7 +30,9 @@
     else
         test = true;
     end
-    
+    if isinf(sigma) || isnan(sigma)
+        error('Starting sigma is %0.02f, highGuess is %0.02f and lowGuess is %0.02f. This usually means there are zeros in wavelet amplitudes, could be present in trainingSet too.', sigma, highGuess, lowGuess)
+    end
     while test
         
         if P > perplexity
@@ -65,4 +67,4 @@
     
     
     
-    
\ No newline at end of file
+