How can i plot each line with different colors

Hi,

i wrote a gui that can read and plot different variables from different sensors.

Here you can see the callback function of my 'Plot'-Button

function PlotButton_Callback(hObject, eventdata, handles)
% hObject    handle to PlotButton (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

hold on;
PathName=evalin('base','PathName');
FileName=evalin('base','FileName');
SelectedELU=evalin('base','SelectedELU');
SelectedVar=evalin('base','SelectedVar');
FileName=sort(FileName);
PlotData=[];
TimeData=[];
d='1970-01-01 02:00:00.000'; %define start date of Timecode
t = datetime(d,'InputFormat','yyyy-MM-dd HH:mm:ss.SSS');
C = {'k','b','r','g','y',[.5 .6 .7],[.8 .2 .6]}; % Cell array of colros.
for r=1:length(SelectedELU)
    
    for k=1:length(FileName)
        load([PathName FileName{k}]);
        y=eval(SelectedELU{r});
        i=SelectedVar{1};
        yy=y.(i);
        PlotData=[PlotData yy];
        
        yy=y.SYSTEMTIME;
        yy= seconds(yy);
        yy=yy(:)/1000;
        
        yy= yy + t;
        TimeData=[TimeData; yy];
    end
%     assignin('base','PlotData',PlotData)
%     assignin('base','TimeData',TimeData)
    
    plot(TimeData,PlotData','color',C{r},'DisplayName',SelectedELU{r});
    
end
%             assignin('base','PlotData',PlotData)
%             assignin('base','TimeData',TimeData)

ylabel(i);
axis 'tight'

The nested for-loop collects all the data from one sensor and the outer for-loop plots the data and starts the whole pocedure again for the next sensor.

The Problem is: All plots have the same color

i tried debugging with breakpoints and what i saw was: the first line is plotted in black as it should be, but when the second line is plotted the first one changes its color to blue, and when the third one is plotted the first two change their colors to red.

So everytime a line is plotted all existing lines change to the same color.

i'm pretty sure this can be fixed very easily but i just can't figure out how.

Thank You!!

Answer 1

[Sebastian Körner]

function Plot_Callback(hObject, eventdata, handles)
% hObject    handle to Plot (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
cla
hold all;
PathName=evalin('base','PathName');
FileName=evalin('base','FileName');
StringEPS=evalin('base','StringEPS');
SelectedELU=evalin('base','SelectedELU');
SelectedVar=evalin('base','SelectedVar');
FileName=sort(FileName);
d='1970-01-01 02:00:00.000'; %define start date of Timecode
t = datetime(d,'InputFormat','yyyy-MM-dd HH:mm:ss.SSS');
for r=1:length(SelectedELU)
    PlotData=[];
    TimeData=[];
    for k=1:length(FileName)
        load([PathName FileName{k}]);
        y=eval(SelectedELU{r});
        i=SelectedVar{1};
        yy=y.(i);
        PlotData=[PlotData; yy'];
        
        yy=y.SYSTEMTIME;
        yy= seconds(yy);
        yy=yy(:)/1000;
        
        yy= yy + t;
        TimeData=[TimeData; yy];
    end
    try
        Plot(:,r)=PlotData;
        Time(:,r)=TimeData;
    catch
        if length(Plot)>length(PlotData)
            a(length(Plot)-length(PlotData),1)=NaN;
            b(length(Plot)-length(PlotData),1)=NaT;
            PlotData=[PlotData; a];
            TimeData=[TimeData; b];
            Plot(:,r)=PlotData;
            Time(:,r)=TimeData;
        elseif length(Plot)<length(PlotData)
            
            PlotData=PlotData(1:length(Plot),1);
            TimeData=TimeData(1:length(Plot),1);
            Plot(:,r)=PlotData;
            Time(:,r)=TimeData;
        end
    end

end

for r=1:length(SelectedELU)
 plot(Time(:,r),Plot(:,r),'DisplayName',StringEPS{r});
end
%assignin('base','PlotData',PlotData)
%assignin('base','TimeData',TimeData)
legend('Location','best')
ylabel(i);
xlabel('Date')
axis 'tight'
zoom on
dcm_obj = datacursormode(gcf);
   set(dcm_obj,'DisplayStyle','datatip',...
      'SnapToDataVertex','off','Enable','on', ...
      'UpdateFcn',{@myupdatefcn})

i fixed the problem some time ago and wanted to complete this thread.

the solution to the problem was to put the plot command outside of the for loop. so i saved all my plot and time data in arrays and plot them in a seperate loop.

i dont know why it works like this and why it doesent work with the original version, but who cares as long as it works...

Answer 2

[KALYAN ACHARJYA]

Try

plot(TimeData,PlotData','color',C{randi(1,5)},'DisplayName',SelectedELU{r});

Another?

Have tou tried with hold on and plot in the same figure?

More:

Please ensure that C cell element must be change upto 5, so thet it catch the different color element in the cell array of C, as defined earlier.

I can't test the complete code without of complete input data.

[Sebastian Körner]

your code line doesn't work it produces an error.

but i changed my code to:

plot(TimeData,PlotData','color',C{mod(r,5)+1},'DisplayName',SelectedELU{r});

in order to avoid "index exceeds number of array elements"

yes i tried hold on and plot in the same figure, but i get the same outcome.

The problem ist not in plotting the lines in the wanted color, the problem is that all other lines change their color to the current one.

I'm very sorry but i can't give you data to test the code because this data is confidential.