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support for adding/subtracting constant #183

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Merged
evaleev merged 1 commit into from
Mar 13, 2025
Merged

support for adding/subtracting constant #183

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36 changes: 36 additions & 0 deletions btas/tensor.h
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Original file line number Diff line number Diff line change
Expand Up @@ -585,6 +585,24 @@ namespace btas {
return y; /* automatically called move semantics */
}

/// adds a number to every element
Tensor operator+(const value_type& x) const {
Tensor y = this->clone();
y += x;
return y; /* automatically called move semantics */
}

/// adds a number to every element
Tensor& operator+=(const value_type& x) {
using std::begin;
using std::cbegin;
using std::cend;
std::transform(cbegin(storage_), cend(storage_), begin(storage_), [x](const auto& v) {
return v+x;
});
return *this;
}

/// subtraction assignment
Tensor& operator-=(const Tensor& x) {
using std::begin;
Expand All @@ -603,6 +621,24 @@ namespace btas {
return y; /* automatically called move semantics */
}

/// subtracts a number from every element
Tensor operator-(const value_type& x) const {
Tensor y = this->clone();
y -= x;
return y; /* automatically called move semantics */
}

/// subtracts a number from every element
Tensor& operator-=(const value_type& x) {
using std::begin;
using std::cbegin;
using std::cend;
std::transform(cbegin(storage_), cend(storage_), begin(storage_), [x](const auto& v) {
return v-x;
});
return *this;
}

/// \return bare const pointer to the first element of data_
/// this enables to call BLAS functions
const_pointer data() const {
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8 changes: 8 additions & 0 deletions unittest/tensor_test.cc
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Expand Up @@ -219,6 +219,14 @@ TEST_CASE("Tensor Operations") {
CHECK_NOTHROW( static_cast<double>(T0) == 11);
}

SECTION("Add/subtract constant") {
T3.fill(1.);
auto T3_plus_1 = T3 + 1.;
for (auto x : T3_plus_1) CHECK(x == 2.);
T3_plus_1 -= 1.;
for (auto x : T3_plus_1) CHECK(x == 1.);
}

SECTION("Generate") {
std::vector<double> data(T3.size());
for (auto& x : data) x = rng();
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