i=3; 
text = ['function [y]=plus'+string(i)+'(x)';  /// \sleftarrow{{\normalfont build a string vector}}
        'y = x +' + string(i);
        'endfunction'] 
execstr(text);  /// \sleftarrow{{\normalfont Scilab evaluation of the built string  }}
plus3(4)   /// \sleftarrow{{\normalfont using the newly created \verb+plus3+ {function} }}