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Added a dot() and slicing support to dlib.vector()

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This commit is contained in:
Davis King 2013-06-26 21:45:57 -04:00
parent 20ed7ebeb8
commit 421e5bcd6f
1 changed files with 32 additions and 0 deletions
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32
tools/python/src/vector.cpp
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@ -5,6 +5,7 @@
#include <boost/shared_ptr.hpp>
#include <dlib/matrix.h>
#include "serialize_pickle.h"
#include <boost/python/slice.hpp>
using namespace dlib;
@ -19,6 +20,11 @@ void cv_set_size(cv& m, long s)
m = 0;
}
double dotprod ( const cv& a, const cv& b)
{
return dot(a,b);
}
string cv__str__(const cv& v)
{
ostringstream sout;
@ -100,6 +106,29 @@ double cv__getitem__(cv& m, long r)
}
cv cv__getitem2__(cv& m, slice r)
{
slice::range<cv::iterator> bounds;
bounds = r.get_indices<>(m.begin(), m.end());
long num = (bounds.stop-bounds.start+1);
// round num up to the next multiple of bounds.step.
if ((num%bounds.step) != 0)
num += bounds.step - num%bounds.step;
cv temp(num/bounds.step);
if (temp.size() == 0)
return temp;
long ii = 0;
while(bounds.start != bounds.stop)
{
temp(ii++) = *bounds.start;
std::advance(bounds.start, bounds.step);
}
temp(ii) = *bounds.start;
return temp;
}
tuple cv_get_matrix_size(cv& m)
{
return make_tuple(m.nr(), m.nc());
@ -115,8 +144,11 @@ void bind_vector()
.def("__str__", &cv__str__)
.def("__len__", &cv__len__)
.def("__getitem__", &cv__getitem__)
.def("__getitem__", &cv__getitem2__)
.def("__setitem__", &cv__setitem__)
.add_property("shape", &cv_get_matrix_size)
.def_pickle(serialize_pickle<cv>());
def("dot", dotprod, "Compute the dot product between two dense column vectors.");
}