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// Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
// Copyright (C) 2002-2004 - INRIA - Vincent COUVERT
//
// This file must be used under the terms of the CeCILL.
// This source file is licensed as described in the file COPYING, which
// you should have received as part of this distribution. The terms
// are also available at
// http://www.cecill.info/licences/Licence_CeCILL_V2.1-en.txt
function [tree]=%s2sci(tree)
// M2SCI function
// Conversion function for Matlab subtraction
// Input: tree = Matlab operation tree
// Output: tree = Scilab equivalent for tree
// Emulation function: mtlb_s()
// In Matlab only two matrices with the same size can be added unless one is a scalar
// So empty matrix can only be added to a scalar or an onther empty matrix
// For example: [1,2,3]-[] is not possible
// An other important difference with Scilab is that:
// - Matlab gives : [1]-[]=[]
// - Scilab gives : [1]-[]=[1]
// Overloading functions in $SCI/modules/compatibility_functions/macros/:
// - %b_s_s.sci
// - %s_s_b.sci
// Binary operator: A-B
if size(tree.operands)==2 then
[A,B]=getoperands(tree)
// Matlab and Scilab subtraction do not match for Strings
if or(A.vtype==[String,Unknown]) then
A=convert2double(A)
end
if or(B.vtype==[String,Unknown]) then
B=convert2double(B)
end
// %b_s_b is not defined in Scilab
if A.vtype==Boolean & B.vtype==Boolean
A=convert2double(A)
end
tree.operands=list(A,B)
// Type inference
if (is_complex(A) & is_real(B)) | (is_complex(B) & is_real(A)) then
tree.out(1).type=Type(Double,Complex)
elseif is_real(A) & is_real(B) then
tree.out(1).type=Type(Double,Real)
else
tree.out(1).type=Type(Double,Unknown)
end
// When both operands are not [] Scilab and Matlab give the same results
if not_empty(A) & not_empty(B) then
if is_a_scalar(A) then
tree.out(1).dims=B.dims
else
tree.out(1).dims=A.dims
end
// If at least one operand is [] then Matlab result is [] but not Scilab one
elseif is_empty(A) | is_empty(B) then
set_infos(msprintf(gettext("At least one operand of %s is an empty matrix, Scilab equivalent is []."),expression2code(tree)),0)
tree=Cste([])
else
tree.out(1).dims=allunknown(A.dims);
tree=Funcall("mtlb_s",1,list(A,B),tree.out);
end
else
A=getoperands(tree)
//A=convert2double(A)
tree.operands=list(A)
tree.out(1).dims=A.dims
tree.out(1).type=A.type
end
endfunction
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