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diff --git a/macros/FunctionAnnotation/FA_SZ_OPMINUS.sci b/macros/FunctionAnnotation/FA_SZ_OPMINUS.sci
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+function opoutsize = FA_SZ_OPMINUS(in1size,in2size)
+// function opoutsize = FA_SZ_OPMINUS(in1size,in2size)
+// -----------------------------------------------------------------
+// Returns the size of the output computed by OPMINUS operator.
+// 
+// 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.
+//
+// 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:
+// 08-Dec-2007 -- Raffaele Nutricato: Author.
+// 08-Dec-2007 -- Alberto Morea: Test Ok.
+//
+// Copyright 2007 Raffaele Nutricato & Alberto Morea.
+// Contact: raffaele.nutricato@tiscali.it
+// -----------------------------------------------------------------
+
+// ------------------------------
+// --- Check input arguments. ---
+// ------------------------------
+SCI2CNInArgCheck(argn(2),2,2);
+
+opoutsize = FA_SZ_OPPLUSA(in1size,in2size);
+
+endfunction