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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-en.txt
function [tree]=sci_diff(tree)
// M2SCI function
// Conversion function for Matlab diff()
// Input: tree = Matlab funcall tree
// Ouput: tree = Scilab equivalent for tree
// Emulation function: mtlb_diff()
// Y = diff(X)
if rhs==1 then
X=getrhs(tree)
// %c_diff and %b_diff are not defined in Scilab
X=convert2double(X)
tree.rhs=Rhs_tlist(X)
dim = first_non_singleton(X)
if dim==-1 then
// All output dims are unknown
tree.lhs(1).dims=allunknown(X.dims)
// First non singleton dimension will be computed at execution
tree.rhs=Rhs_tlist(X,1,Funcall("firstnonsingleton",1,list(X),list()))
else
tree.lhs(1).dims=X.dims
if dim==0 then
tree.rhs=Rhs_tlist(X)
else
tree.rhs=Rhs_tlist(X,1,dim)
tree.lhs(1).dims(dim)=max(X.dims(dim)-1,-1)
end
end
tree.lhs(1).type=Type(Double,Unknown)
// Y = diff(X,n)
elseif rhs==2 then
[X,n] = getrhs(tree);
X = convert2double(X)
n = convert2double(n)
tree.rhs=Rhs_tlist(X,n)
if ~is_a_vector(X) then
tree.name="mtlb_diff"
end
tree.lhs(1).dims=allunknown(X.dims)
tree.lhs(1).type=Type(Double,Unknown)
// Y = diff(X,n,dim)
else
[X,n,dim] = getrhs(tree);
X = convert2double(X)
n = convert2double(n)
dim = convert2double(dim)
tree.rhs=Rhs_tlist(X,n,dim)
tree.lhs(1).dims=allunknown(X.dims)
tree.lhs(1).type=Type(Double,Unknown)
end
endfunction
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