How to set a label on the xaxis

Question

jjlivestrong 2012-9-27

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/49259-how-to-set-a-label-on-the-xaxis

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?

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Star Strider 2012-9-27

编辑：Star Strider 2012-9-27

在 MATLAB Online 中打开

I do not fully understand what you want to do.

To start, I suggest deleting this line:

datetick('x',1) title('Wind(Knots) versus Time (dd-mmmm-yyyy)','fontsize',12,'fontweight','b');

and replacing it with this line:

title('Wind(Knots) versus Time (dd-mmmm-yyyy)','fontsize',12,'fontweight','b')

and run your code again. Does your code now do what you want it to do?

jjlivestrong 2012-9-27

Yes. That it's exactly what I want to do, but Instead the code you are suggesting only outputs the name TODAY below the first points. I want to also display REST OF TODAY on the other points.

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Answer 1

Star Strider 2012-9-27

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/49259-how-to-set-a-label-on-the-xaxis#answer_60192

在 MATLAB Online 中打开

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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jjlivestrong 2012-9-27

在 MATLAB Online 中打开

My mistake Star Strider,

I wrote the code of,

 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

as a guide of what I wanted in the output. It is not included in my final code.

The code I want you to examine is just this one, and ignore the part that starts with t = 0

 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

What I want is to write the xlabel of "TODAY" and "REST OF TODAY" on this plot and this plot only.

When I included this part:

 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

it was a reference of what I wanted as an output on the xaxis, and it does NOT goes in my algorithm. Just ignore it.

Sorry for my lack of coherence.

Star Strider 2012-9-27

编辑：Star Strider 2012-9-27

在 MATLAB Online 中打开

No need to apologise.

Does this do what you want?

   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,'XTick',[TODAY REST_OF_TODAY],'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

Again, I commented the line I deleted, and inserted the corrected line below it. Note that I changed TODAY:REST_OF_TODAY to [TODAY REST_OF_TODAY] and put it in the same set statement.

Moon Datta 2012-11-15

Thank you Sir. It has helped me also..........

Star Strider 2012-11-15

Again, my pleasure!

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