How to make a plot with different colors to represent different data values/thresholds?

I need to generate a plot have a couple of elements below: ▪ Small dots when State 5 = green, State 3 = yellow ▪ Big circles when thresholds occur: State 5 = orange, State 3 = red

Appreciate tips/assistance on this.

Answer 1

[D. Plotnick]

You can use a nested switch-case statement. Lets say you have data x,y,state1,state2.

 switch state1
               case 5 
                   switch state2
                       case 1
                            markerSize = 3;
                            color = 'r'
                            marker = '.'
                       case 2
                            ""
                            ""
                            ""
                       end
                case 3
                     ""
                     ""
                     ""
                end
  end
 mn = [color,marker]
plot(x,y,mn,'MarkerSize',markerSize);

You should be able to fill in the rest: nested switches are good for this, you will just have to appropriately define you cases for each switch.

[Ivy Chen]

Thanks, I will give it a try after receiving the defined data.

[Ivy Chen]

Daniel, I have difficulty of get this to work. Basically, this is what I am trying to achieve. Appreciate any help that you might able to provide. thanks again.

scatter(C_N04,VE,5); 
  for k=1:length(C_N04)
      if strcmp(Tracking,'TRUE')
          if C_A_code_tracks==1
             set(gcf, 'markerSize',2, 'color','yellow', 'marker','.')        
          elseif C_A_carrier==1
             set(gcf, 'markerSize',2, 'color','green', 'marker','.')   
          else
             set(gcf, 'markerSize',2, 'color','black', 'marker','-')   
          end
      elseif strcmp(Tracking,'FALSE')
          if C_A_carrier_tracks==0
             set(gcf, 'markerSize',2, 'color','orange', 'marker','o')        
          elseif C_A_coade_tracks==0
           set(gcf, 'markerSize',2, 'color','red', 'marker','o')  
          else
             set(gcf, 'markerSize',2, 'color','black', 'marker','-')   
          end        
      end

[Ivy Chen]

this is what I have, but it says that "SWITCH expression must be a scalar or string constant." Not sure where the mistake is... thanks for help.

C_N04 = TexasPorkButt.C_N04(Idx);
VE = TexasPorkButt.True_VE(Idx);  
Tracking = TexasPorkButt.Tracking(Idx);
Code_T = TexasPorkButt.C_A_code_tracks(Idx);
Carrier_T = TexasPorkButt.C_A_carrier_tracks(Idx);
switch Tracking
            case strcmp(Tracking,'TRUE')
                 switch (Code_T)
                     case 0
                          markerSize = 3;
                          color = 'black';
                          marker = '-';
                     case 1
                          markerSize = 3;
                          color = 'yellow';
                          marker = '.';
                 end
                     switch (Carrier_T)
                          case 1
                          markerSize = 3;
                          color = 'green';
                          marker = '.';
                     end
            case strcmp(Tracking,'FALSE')
                 switch (Carrier_T)
                     case 0
                          markerSize = 3;
                          color = 'orange';
                          marker = 'o';
                 end
                     switch (Code_T)
                          case 0
                          markerSize = 3;
                          color = 'red';
                          marker = 'o';
                      end                  
end
mn = [color,marker];
plot(C_N04,VE,mn,'MarkerSize',markerSize);