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diff --git a/2.3-1/macros/FunctionAnnotation/FA_SZ_OPPLUSA.sci b/2.3-1/macros/FunctionAnnotation/FA_SZ_OPPLUSA.sci
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+++ b/2.3-1/macros/FunctionAnnotation/FA_SZ_OPPLUSA.sci
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+function opoutsize = FA_SZ_OPPLUSA(in1size,in2size)
+// function opoutsize = FA_SZ_OPPLUSA(in1size,in2size)
+// -----------------------------------------------------------------
+// Returns the size of the output computed by OPPLUS operator 
+// restricted to arithmetic operations (string operations not supported.)
+// 
+// Assuming:
+// size(in1) = [in1r,in1c]
+// size(in2) = [in2r,in2c]
+// size(out) = [outr,outc]
+//
+// we have the following combinations:
+// in1   in2   outr   outc
+// -----------------------
+//  S     S    in2r   in2c    
+//  S     M    in2r   in2c
+//  M     S    in1r   in1c
+//  M     M    in1r   in1c
+//
+// Where S means that the input is a scalar
+// and M means that the input is a matrix.
+// There is also the case related to the string catenation!
+// This is the main difference between - and + operators.
+//
+// Input data:
+// in1size: size of input number 1. It is an array of 2 strings. 
+//          The first string specifies the number of rows.
+//          The second string specifies the number of columns.
+// 
+// in2size: size of input number 2. It is an array of 2 strings. 
+//          The first string specifies the number of rows.
+//          The second string specifies the number of columns.
+//
+// Output data:
+// opoutsize: size of output. It is an array of 2 strings. 
+//            The first string specifies the number of rows.
+//            The second string specifies the number of columns. 
+//
+// Status:
+// 18-Mar-2008 -- Raffaele Nutricato: Author.
+// 18-Mar-2008 -- Alberto Morea: Test Ok.
+//
+// Copyright 2008 Raffaele Nutricato & Alberto Morea.
+// Contact: raffaele.nutricato@tiscali.it
+// -----------------------------------------------------------------
+
+// ------------------------------
+// --- Check input arguments. ---
+// ------------------------------
+SCI2CNInArgCheck(argn(2),2,2);
+
+// ------------------------
+// --- Generate Output. ---
+// ------------------------
+// --- Get dimensions of input arguments. ---
+in1size = string(in1size);
+in2size = string(in2size);
+in1dim = GetSymbolDimension(in1size);
+
+if (in1dim == 0)
+   opoutsize = in2size;
+else
+   opoutsize = in1size;
+end
+
+endfunction