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    %% Override Default Properties of the Line
% 
%%
% Create a symbol specification and specify the default color used for
% lines. As seen in the previous example, the default is blue.  This
% example sets the default to black.

% Copyright 2015 The MathWorks, Inc.

roadspec = makesymbolspec('Line',...
                              {'Default', 'Color', 'black'}, ...
                              {'ADMIN_TYPE',0,'Color','c'}, ...
                              {'ADMIN_TYPE',3,'Color','r'},...
                              {'CLASS',6,'Visible','off'},...
                              {'CLASS',[1 4],'LineWidth',2});
%%
% Display the vector data, using the symbol specification. Note how the
% major roads displayed in blue in the previous example are now black.
figure
mapshow('boston_roads.shp','SymbolSpec',roadspec);