problem with displaying multiple plots in one Figure

Hi all, im trying to plot data of 4 (1×1 double Timeserie) vectors i use the code below

 c=title('Einfluss der Geschwindigkeit auf den Energieverbrauch ');
 b=xlabel('Zeit in [ms]');
 a=ylabel('Energieverbrauch des Hauptantriebs in [KW]');
 set(a,'FontSize',15)
 set(b,'FontSize',15)
 set(c,'FontSize',15)
 set(gca,'FontSize',14); 
 axis([0 1030 50 63])

 plot(E_Real_Hauptantrieb_130.time,E_Real_Hauptantrieb_130.Data,'-ob');
 grid on;
 hold on;

 plot(E_Real_Hauptantrieb_100.time,E_Real_Hauptantrieb_100.time,'-og');
 grid on;
 hold on;

 plot(E_Real_Hauptantrieb_80.time,E_Real_Hauptantrieb_80.time,'-or');
 grid on;
 hold on;

 plot(E_Real_Hauptantrieb_60.time,E_Real_Hauptantrieb_60.time,'-oy');
 grid on;
 hold off;

 legend('130 km/h','100 km/h','80 km/h','60 km/h')

but Matlab always crash or show me a black screen Figure does any body know why ?

[José-Luis]

How big are your data?

Answer 1

[Massimo Zanetti]

To plot in the same figure use SUBPLOT. Something like this:

figure;
subplot(2,2,1);
  plot(E_Real_Hauptantrieb_130.time,E_Real_Hauptantrieb_130.Data,'-ob');
subplot(2,2,2);
  plot(E_Real_Hauptantrieb_100.time,E_Real_Hauptantrieb_100.time,'-og');
subplot(2,2,3);
 plot(E_Real_Hauptantrieb_80.time,E_Real_Hauptantrieb_80.time,'-or');
subplot(2,2,4);
 plot(E_Real_Hauptantrieb_60.time,E_Real_Hauptantrieb_60.time,'-oy');

Then adjust legends and whatever for each subplot.

[Alex]

Hi, thnx for the quick answer. I just tried what the code u suggest but i still have the same problem. I think the problem is rather by the size of the time series vector which is by 34 Mb

[Massimo Zanetti]

Ok, then if you believe the problem is the vector size, try to decimate the vectors (downsampling). Here is an example from Matlab help:

t = 0:.00025:1;
x = sin(2*pi*30*t) + sin(2*pi*60*t);
y = decimate(x,4);
subplot 211
stem(0:120,x(1:121),'filled','markersize',3)
grid on
xlabel 'Sample number',ylabel 'Original'
subplot 212
stem(0:30,y(1:31),'filled','markersize',3)
grid on
xlabel 'Sample number',ylabel 'Decimated'

[Alex]

Hi,

i dont really understand the code what u post, where i souhld exactly put my Data ?

[Massimo Zanetti]

Consider this line for example:

plot(E_Real_Hauptantrieb_130.time,E_Real_Hauptantrieb_130.Data,'-ob');

Being the two vectors E_Real_Hauptantrieb_130.time and E_Real_Hauptantrieb_130.Data too big, Matlab crushes or do not show you the plots. So, you can downsample them (meaning that you can extract only some values from the vectors) so that you can decrease their size. For example try:

plot(decimate(E_Real_Hauptantrieb_130.time,100),decimate(E_Real_Hauptantrieb_130.Data,100),'-ob');

[Alex]

@Zanetti it works !!