From 4f479bfbe8c9076bc38711617365b5dd2b8d2c71 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?St=C3=A9phane=20Adjemian=20=28Charybdis=29?=
 <stepan@dynare.org>
Date: Mon, 30 Sep 2019 22:45:24 +0200
Subject: [PATCH] Allow diff(-diff(X)) or diff(-log(X)) in the LHS.

---
 matlab/aggregate.m | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/matlab/aggregate.m b/matlab/aggregate.m
index dbdb6c92b..dea0fb4df 100644
--- a/matlab/aggregate.m
+++ b/matlab/aggregate.m
@@ -213,7 +213,7 @@ function [lhs, rhs] = getequation(str)
     terms = strsplit(str, {'=',';'});
     terms(cellfun(@(x) all(isempty(x)), terms)) = [];
     terms(1) = {strrep(terms{1}, ' ', '')};
-    lhs = regexp(terms{1}, '^(diff\((log|diff)\([\-\+\*\/\w]*\)\)|(log|diff)\([\-\+\*\/\w]*\)|\w*)', 'match');
+    lhs = regexp(terms{1}, '^(diff\([\-]*(log|diff)\([\-\+\*\/\w]*\)\)|(log|diff)\([\-\+\*\/\w]*\)|\w*)', 'match');
     if ~isempty(lhs)
         lhs = lhs{1};
         if isequal(lhs, 'log')