MATLAB: I am getting Unbalanced or unexpected parenthesis or bracket

mask parameters intilizationsimulink

Actually i have written code in mask parameter in initialization and while i am applying i am getting error like unbalance or unexpected parenthesis or bracket so can please help me out of this problem…… i am using matlab 2014 version…. here is the code…
if PlotVI_Module
  assignin('base', 'Voc', Voc);
  assignin('base', 'Isc', Isc);
  assignin('base', 'Rs', Rs);
  assignin('base', 'Rp', Rp);
  assignin('base', 'Isat', Isat);
  assignin('base', 'Vt', Vt);
   if PlotVI_Module,
       F1 = figure('Name', 'IV and PV characteristics of a Module at 25 deg.c');
   end
   load_system('PV_Model_Param');
   for ksun=1:-0.25:0.25
       assignin('base', 'Iph', Iph*ksun);
       sim('PV_Model_Param');
       n=find(I_PV>=1);
       I_PV=I_PV(n);
       P_PV=V_PV.*I_PV;
       if PlotVI_Module
           figure(F1);
           subplot(211)
           if ksun==1
               plot(V_PV, I_PV, 'b' (0 Vmp Voc), (Isc Imp 0), 'ro')
               text(Voc/15, Isc*1.1, '1 Kw/m^2')
               hold on
               grid
           else
               plot(V_PV, I_PV, '--m')
               text(Voc/15, Isc*(ksun+0.1), sprintf('%g Kw/m^2', ksun))
           end
           subplot(212)
           if ksun==1
               plot(V_PV, P_PV, 'b', (0 Vmp Voc), (0 Imp*Vmp 0), 'ro')
               text(Vmp*1.02, Vmp*Imp, '1 Kw/m^2')
               hold on
               grid
           else
               n=find(P_PV==max(P_PV));
               plot(V_PV, P_PV, '--m', V_PV(n), P_PV(n), 'mo')
               text(Vmp*1.02, Vmp*Imp*ksun, sprintf('%g Kw/m^2', ksun))
           end
           subplot(211)
           ylabel('Current (A)')
           xlabel('Voltage (V)')
           title('PV_Module')
           axis_xy=axis;
           axis_xy(4)=Isc*1.2;
           axis(axis_xy);
           subplot(212)
           ylabel('Power (W)')
           xlabel('Voltage (V)')
           axis_xy=axis;
           axis_xy(4)=Vmp*Imp*1.2;
           axis(axis_xy);
           set_param(BlockName,'PlotVI_Module', 'off')
       end
   end
end

Best Answer

This is no valid Matlab syntax:
plot(V_PV, I_PV, 'b' (0 Vmp Voc), (Isc Imp 0), 'ro')
%                    ^^^^^^^^^^^  ^^^^^^^^^^^
and
plot(V_PV, P_PV, 'b', (0 Vmp Voc), (0 Imp*Vmp 0), 'ro')
%                     ^^^^^^^^^^^  ^^^^^^^^^^^^^
What is the purpose of these lines? Perhaps you want to replace the round parentheses by square brackets for a horizontal concatenation, and insert a comma in the first case?
plot(V_PV, I_PV, 'b', [0 Vmp Voc], [Isc Imp 0], 'ro')
plot(V_PV, P_PV, 'b', [0 Vmp Voc], [0 Imp*Vmp 0], 'ro')
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