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% STK_TESTFUN_TRUSS3_VOL computes the volume of the 'truss3' structure
%
% CALL: V = stk_testfun_truss3_vol (X, CONST)
%
% See also: stk_testcase_truss3, stk_testfun_truss3_bb
% Copyright Notice
%
% This file: stk_testfun_truss3_vol.m was written in 2017
% by Julien Bect <julien.bect@centralesupelec.fr>.
%
% To the extent possible under law, the author(s) have dedicated all
% copyright and related and neighboring rights to this file to the pub-
% lic domain worldwide. This file is distributed without any warranty.
%
% This work is published from France.
%
% You should have received a copy of the CC0 Public Domain Dedication
% along with this file. If not, see
% <http://creativecommons.org/publicdomain/zero/1.0/>.
% Copying Permission Statement (STK toolbox as a whole)
%
% This file is part of
%
% STK: a Small (Matlab/Octave) Toolbox for Kriging
% (https://github.com/stk-kriging/stk/)
%
% STK is free software: you can redistribute it and/or modify it under
% the terms of the GNU General Public License as published by the Free
% Software Foundation, either version 3 of the License, or (at your
% option) any later version.
%
% STK is distributed in the hope that it will be useful, but WITHOUT
% ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
% or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
% License for more details.
%
% You should have received a copy of the GNU General Public License
% along with STK. If not, see <http://www.gnu.org/licenses/>.
function V = stk_testfun_truss3_vol (x, const)
% Convert input to double-precision input data
% (and get rid of extra structure such as table or stk_dataframe objects)
x_ = double (x);
% Extract design variables
a1 = x_(:, 1);
a2 = x_(:, 2);
a3 = x_(:, 3);
w = x_(:, 4);
% Extract constants
L = const.L;
D = const.D;
% Length of bar 1 and bar 3
L1 = sqrt (L ^ 2 + w .^ 2);
L3 = sqrt (L ^ 2 + (D - w) .^ 2);
% Total volume
V = a1 .* L1 + a2 * L + a3 .* L3;
% df-in/df-out
if isa (x, 'stk_dataframe')
V = stk_dataframe (V, {'V'}, x.rownames);
end
end % function
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