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| Matlab or Octave |
= sum( sum(x) )
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| C++ |
= sum(x)
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= sum( sum(x) )
sets y to the sum of the elements in the matrix x.
If either m or n is equal to one,
= sum(x)
also sets y to the sum of the elements in the matrix x.
function [ok] = sum_ok()
ok = true;
m = 2;
n = 3;
x = rand(m, n);
% ------------------
y = sum( sum(x) );
% ------------------
[p, q] = size(y);
ok = ok & (p == 1) & (q == 1);
ok = ok & abs( y - ones(1, m) * x * ones(n, 1) ) < 1e-10;
return
= sum(x)
where x is an @(@
m \times n
@)@ ublas matrix<double>
and y is a double.
# include <mat2cpp.hpp>
bool sum_ok(void)
{ bool ok = true;
using namespace mat2cpp;
size_t i, j, m(2), n(3);
matrix<double> x = rand(m, n);
// ---------------
double y = sum(x);
// ---------------
double check = 0.;
for(i = 0; i < m; i++)
{ for(j = 0; j < n; j++)
check += x(i,j);
}
ok &= std::fabs(check - y) < 1e-10;
return ok;
}