From 27101824a48c4e9ec41f527e112e04e6817dd7de Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=BCrgen=20Fuhrmann?= <juergen-fuhrmann@web.de>
Date: Thu, 11 Jun 2026 17:52:17 +0200
Subject: [PATCH] Add Base.similar method for GenericSparseMatrix

---
 Project.toml                              |  2 +-
 src/genericmtextendablesparsematrixcsc.jl | 18 ++++++++++++++++++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/Project.toml b/Project.toml
index 8b106a4..5693471 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,6 +1,6 @@
 name = "ExtendableSparse"
 uuid = "95c220a8-a1cf-11e9-0c77-dbfce5f500b3"
-version = "2.1"
+version = "2.2.0"
 authors = ["Juergen Fuhrmann <juergen.fuhrmann@wias-berlin.de>", "Daniel Runge"]
 
 [deps]
diff --git a/src/genericmtextendablesparsematrixcsc.jl b/src/genericmtextendablesparsematrixcsc.jl
index a97658d..d980b93 100644
--- a/src/genericmtextendablesparsematrixcsc.jl
+++ b/src/genericmtextendablesparsematrixcsc.jl
@@ -46,6 +46,24 @@ function partitioning!(ext::GenericMTExtendableSparseMatrixCSC{Tm, Tv, Ti}, colp
 end
 
 
+"""
+    $(TYPEDSIGNATURES)
+"""
+function Base.similar(M::GenericMTExtendableSparseMatrixCSC{Tm, Tv, Ti}) where {Tm, Tv, Ti}
+    (m, n) = size(M)
+    p = length(M.xmatrices)
+    xmatrices = [Tm(m, n) for i in 1:p]
+    colparts = M.colparts
+    partnodes = M.partnodes
+    return GenericMTExtendableSparseMatrixCSC(
+        spzeros(Tv, Ti, m, n),
+        xmatrices,
+        colparts,
+        partnodes
+    )
+end
+
+
 """
     $(TYPEDSIGNATURES)
 """