MATLAB: How to set a label on the xaxis

xticklabel

I am trying to set a specific xlabel on a plot using set commands.
The graph plots wind data versus time of day and it goes like this:
 TODAY = datenum([2012 9 21 7 0 0]);
 REST_OF_TODAY = datenum([2012 9 21 17 0 0]);
 y_max1 = max([5,10]); 
 y_min1 = min([5,10]); 
 y_max2 = max([6 11]); 
 y_min2 = min([6 11]);
 plot(TODAY,y_max1,'-- ys','LineWidth',2,'MarkerEdgeColor','r','MarkerFaceColor','g','MarkerSize',10)       hold on 
plot(TODAY,y_min1,'--ys','LineWidth',2,'MarkerEdgeColor','b','MarkerFaceColor','y','MarkerSize',10)      
plot(REST_OF_TODAY,y_max2,'--ys','LineWidth',2,'MarkerEdgeColor','r','MarkerFaceColor','g','MarkerSize',10)      plot(REST_OF_TODAY,y_min2,'--ys','LineWidth',2,'MarkerEdgeColor','b','MarkerFaceColor','y','MarkerSize',10)  set(gca,'XTick',TODAY:REST_OF_TODAY) 
 set(gca,'XTickLabel',{'Today','Rest of today'})
 datetick('x',1) title('Wind(Knots) versus Time (dd-mmmm-yyyy)','fontsize',12,'fontweight','b');
 xlabel('Time (dd-mmmm-yyyy)','fontweight','b');
 ylabel('Wind (Knots)','fontweight','b');
 grid minor
and I want to replace the datetick format number '1' by TODAY and REST OF TODAY as shown in this code:
 t0 = 1
 t1 = datenum([2012 9 21 7 0 0]) % 7 am
 today t2 = datenum([2012 9 21 17 0 0]) % 5 pm
 x = linspace(t1,t2); % generates a row vector y of 100 points linearly spaced between and including t1 and t2.
 plot(x,sin(sqrt(x-t0)*pi)) set(gca,'XTick',[t1,floor(t1)+0.5],'XTickLabel',{'Today','Rest of today'})
 grid minor
Can you please help?

Best Answer

You only have two sets of points, so this is the best I can do:
   TODAY = datenum([2012 9 21 7 0 0]);
   REST_OF_TODAY = datenum([2012 9 21 17 0 0]);
   y_max1 = max([5,10]); 
   y_min1 = min([5,10]); 
   y_max2 = max([6 11]); 
   y_min2 = min([6 11]); 
   plot(TODAY,y_max1,'-- ys','LineWidth',2,'MarkerEdgeColor','r','MarkerFaceColor','g','MarkerSize',10)       
   hold on 
  plot(TODAY,y_min1,'--ys','LineWidth',2,'MarkerEdgeColor','b','MarkerFaceColor','y','MarkerSize',10)      
  plot(REST_OF_TODAY,y_max2,'--ys','LineWidth',2,'MarkerEdgeColor','r','MarkerFaceColor','g','MarkerSize',10)      
  plot(REST_OF_TODAY,y_min2,'--ys','LineWidth',2,'MarkerEdgeColor','b','MarkerFaceColor','y','MarkerSize',10)  
  set(gca,'XTick',TODAY:REST_OF_TODAY) 
   set(gca,'XTickLabel',{'Today','Rest of today'})
   title('Wind(Knots) versus Time (dd-mmmm-yyyy)','fontsize',12,'fontweight','b')
   xlabel('Time (dd-mmmm-yyyy)','fontweight','b');
   ylabel('Wind (Knots)','fontweight','b');
   grid minor
   t0 = 1
   t1 = datenum([2012 9 21 7 0 0]) % 7 am today 
   t2 = datenum([2012 9 21 17 0 0]) % 5 pm
   x = linspace(t1,t2); % generates a row vector y of 100 points linearly spaced between and including t1 and t2.
   plot(x,sin(sqrt(x-t0)*pi)) 
  %  set(gca,'XTick',[t1,floor(t1)+0.5],'XTickLabel',{'Today','Rest of today'})
  set(gca,'XTick',[t1 t2],'XTickLabel',{'Today','Rest of today'}) 
  grid minor
Is that what you want? (I commented the line I replaced, and put the corrected line below it. I also included my earlier corrections to your code.)
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