From de6a2d31ffcd1ce1adcc3e273dc6f6459b318f79 Mon Sep 17 00:00:00 2001
From: kritz <kritz@ethz.ch>
Date: Wed, 4 Dec 2019 14:33:33 +0100
Subject: [PATCH] Slice assign value (#111)

* Assign value to slice

* Readme for formatting
---
 README.md        | 10 ++++++++++
 matrix/Slice.hpp | 11 +++++++++++
 test/slice.cpp   | 12 ++++++++++++
 3 files changed, 33 insertions(+)

diff --git a/README.md b/README.md
index 72f553665b..1cc31a5e2f 100644
--- a/README.md
+++ b/README.md
@@ -40,6 +40,16 @@ cmake  -DTESTING=ON ..
 make check
 ```
 
+## Formatting
+The format can be checked as following:
+```
+mkdir build
+cd build
+cmake  -DFORMAT=ON ..
+make check_format
+```
+
+
 ## Example
 
 See the test directory for detailed examples. Some simple examples are included below:
diff --git a/matrix/Slice.hpp b/matrix/Slice.hpp
index 3a1008c21a..fc5c942264 100644
--- a/matrix/Slice.hpp
+++ b/matrix/Slice.hpp
@@ -63,6 +63,17 @@ public:
         return self;
     }
 
+    Slice<Type, P, Q, M, N>& operator=(const Type& other)
+    {
+        Slice<Type, P, Q, M, N>& self = *this;
+        for (size_t i = 0; i < P; i++) {
+            for (size_t j = 0; j < Q; j++) {
+                self(i, j) = other;
+            }
+        }
+        return self;
+    }
+
     // allow assigning vectors to a slice that are in the axis
     template <size_t DUMMY = 1> // make this a template function since it only exists for some instantiations
     Slice<Type, 1, Q, M, N>& operator=(const Vector<Type, Q>& other)
diff --git a/test/slice.cpp b/test/slice.cpp
index 36c252a742..2e2baab1b8 100644
--- a/test/slice.cpp
+++ b/test/slice.cpp
@@ -125,6 +125,18 @@ int main()
     TEST(!v5.xy().longerThan(5.f));
     TEST(isEqualF(5.f, v5.xy().norm()));
 
+    // assign scalar value to slice
+    Matrix<float, 3, 1> L;
+    L(0,0) = -1;
+    L(1,0) = 1;
+    L(2,0) = 3;
+
+    L.slice<2,1>(0,0) = 0.0f;
+
+    float data_5_check[3] = {0, 0, 3};
+    Matrix<float, 3, 1> M (data_5_check);
+    TEST(isEqual(L, M));
+
     return 0;
 }