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function [tree]=sci_exist(tree)
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// Conversion function for Matlab exist()
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// Input: tree = Matlab funcall tree
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// Ouput: tree = Scilab equivalent for tree
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// Emulation function: mtlb_exist()
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no_equiv("Matlab exist(), mtlb_exist() is called")
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set_infos("mtlb_exist() is just a partial emulation of Matlab exist() function !",2)
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scitree.name="mtlb_exist"
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tree.lhs(1).dims=list(1,1)
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tree.lhs(1).type=Type(Double,Real)