I am getting Unbalanced or unexpected parenthesis or bracket?

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

[Sandro Lecci]

What if you simply copy-paste your code in an empty editor? You would immediately see a red line on the right indicating where the error is located.

By the way you are missing a comma

[vamsi Teki]

sorry sir i didn't get you means i have to copy it in script file

[Sandro Lecci]

Yes, File > New > Script.

[vamsi Teki]

thankq so much sir.... i have found my mistake...... thanks a lot for helping me

[Jan]

@vamsi Teki: If you insert the code in the editor, you see, which line is causing the problem - a very useful information.

[vamsi Teki]

ok sir sure next time on-wards when i use code for my matlab file i will check like this only if i get any errors.... thank you so much for sparing time for me

Answer 1

[Jan]

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')

Answer 2

[Pawel Jastrzebski]

Line 1: get rid of the comma:

if PlotVI_Module

Line 15 and 25: change round brackets to square ones and you had a one missing comma:

plot(V_PV, I_PV, 'b', [0 Vmp Voc], [Isc Imp 0], 'ro')

Additional remark: if you keep multiple data sets within one plot function, it might be useful to separate them by line using ellipsis (...) - this way the code is easier to read, i.e.

% plot(x,y, color settings)
plot(...
     V_PV       , I_PV       , 'b', ...
     [0 Vmp Voc], [Isc Imp 0], 'ro')

Last line: it seems that you have one end too many - select all of the code and press Ctrl+I to align the code properly for better clarity.

[Jan]

+1. Separating the data in a multi-input plot command is nice.