types::ndarray<
typename std::remove_cv<
typename std::remove_reference<
decltype(
std::declval<T>()
+
std::declval<typename utils::nested_container_value_type<F>::type>())
>::type
>::type,
1> append(types::ndarray<T,N> const& nto, F const& data) {
typename types::numpy_expr_to_ndarray<F>::type ndata(data);
long nsize = nto.size() + ndata.size();
types::ndarray<
typename std::remove_cv<
typename std::remove_reference<
decltype(
std::declval<T>()
+
std::declval<typename utils::nested_container_value_type<F>::type>())
>::type
>::type,
1> out(types::make_tuple(nsize), __builtin__::None);
size_t i=0;
auto out_back = std::copy(nto.fbegin(), nto.fend(), out.fbegin());
std::copy(ndata.fbegin(), ndata.fend(), out_back);
return out;
}
types::ndarray<T,N> _transpose(types::ndarray<T,N> const & a, long const l[N])
{
auto shape = a.shape;
types::array<long, N> shp;
for(unsigned long i=0; i<N; ++i)
shp[i] = shape[l[i]];
types::ndarray<T,N> new_array(shp, __builtin__::None);
types::array<long, N> new_strides;
new_strides[N-1] = 1;
std::transform(new_strides.rbegin(), new_strides.rend() -1, shp.rbegin(), new_strides.rbegin() + 1, std::multiplies<long>());
types::array<long, N> old_strides;
old_strides[N-1] = 1;
std::transform(old_strides.rbegin(), old_strides.rend() -1, shape.rbegin(), old_strides.rbegin() + 1, std::multiplies<long>());
auto iter = a.buffer,
iter_end = a.buffer + a.size();
for(long i=0; iter!=iter_end; ++iter, ++i) {
long offset = 0;
for(unsigned long s=0; s<N; s++)
offset += ((i/old_strides[l[s]]) % shape[l[s]])*new_strides[s];
new_array.buffer[offset] = *iter;
}
return new_array;
}
types::ndarray<T, 1>
flatten(types::ndarray<T,N> const& a) {
long n = a.size();
T *buffer = new T[n];
std::copy(a.buffer, a.buffer + n, buffer);
long shape[1] = {n};
return types::ndarray<T, 1>(buffer, shape);
}
types::ndarray<T,2> diag(types::ndarray<T,1> const &a, long k=0) {
long n = a.size() + std::abs(k);
types::ndarray<T,2> out(types::make_tuple(n,n), 0);
if(k>=0)
for(long i=0,j =k ; i< n and j<n ;++i,++j)
out[i][j] = a[i];
else
for(long i=-k,j =0 ; i< n and j<n ;++i,++j)
out[i][j] = a[j];
return out;
}
types::ndarray<T,M> resize(types::ndarray<T,N> const& expr, types::array<long, M> const& new_shape)
{
auto where = std::find(new_shape.begin(), new_shape.end(), -1);
if(where != new_shape.end()) {
types::array<long, M> auto_shape(new_shape);
auto_shape[where - new_shape.begin()] = expr.size() / std::accumulate(new_shape.begin(), new_shape.end(), -1L, std::multiplies<long>());
return resize(expr, auto_shape);
}
types::ndarray<T,M> out(new_shape, __builtin__::None);
auto nshape = out.size();
auto n = expr.size();
if(n < nshape) {
auto iter = std::copy(expr.fbegin(), expr.fend(), out.fbegin());
for(size_t i = 1; i < nshape / n; ++i) {
iter = std::copy(out.fbegin(), out.fbegin() + n, iter);
}
std::copy(out.fbegin(), out.fbegin() + nshape % n, iter);
}
else
std::copy(expr.fbegin(), expr.fbegin() + nshape, out.fbegin());
return out;
}
types::ndarray<T,1> resize(types::ndarray<T,N> const& expr, int new_shape)
{
types::ndarray<T,1> out(types::array<long, N> {{new_shape}}, __builtin__::None);
auto n = expr.size();
if(n < new_shape) {
auto iter = std::copy(expr.fbegin(), expr.fend(), out.fbegin());
for(size_t i = 1; i < new_shape / n; ++i)
iter = std::copy(out.fbegin(), out.fbegin() + n, iter);
std::copy(out.fbegin(), out.fbegin() + new_shape % n, iter);
}
else
std::copy(expr.fbegin(), expr.fbegin() + new_shape, out.fbegin());
return out;
}
T item(types::ndarray<T, N> const& expr, long i)
{
if(i<0) i += expr.size();
return *(expr.fbegin() + i);
}
types::ndarray<typename types::numpy_type<dtype>::type,1> cumprod(types::ndarray<T,N> const& expr, dtype d = dtype()) {
long count = expr.size();
types::ndarray<typename types::numpy_type<dtype>::type,1> cumprody(types::make_tuple(count), __builtin__::None);
std::partial_sum(expr.buffer, expr.buffer + count, cumprody.buffer, std::multiplies<T>());
return cumprody;
}