drawing bar graph

i wanna draw a bar graph consisting of 2 bars..one ranging 10-20 on the x axis and the other 40-50 on the x axis....the value of y axis does not matter to me..how do i do it??please help..

Answer 1

[the cyclist]

There are a couple ways to do this. I think this one may be easiest for you. I wrote it in some detail, with parameters so that you could see what is going on.

leftBarCenter  = 15;
rightBarCenter = 45;

desiredWidth = 5;

figure
hb=bar([leftBarCenter rightBarCenter],[1 2]);
set(gca,'XLim',[0 60],'XTick',0:5:60); % Not strictly necessary, but shows result better

% Need to calculate relative width

relativeWidth = 2*desiredWidth/(rightBarCenter-leftBarCenter);

set(hb,'BarWidth',relativeWidth)

If you are very familiar with property handles, then you may find a different way easier. The handles of bars have an XData property that stores their absolute X position. You can edit those, instead.

[Sumit]

this solution is workin perfectly...thank u...bt would like a little more help from u...

along with the previous thing i now want to draw a bar from 15-25...that is i want to merge two bars..

and secondly i want to draw a bar from 12-14 and 16-19..that is two bars completely merging with the bar that was rangin from 10-20

[Sumit]

one more thing here the width of both the bars are same(10-20 and 40-50 that is 10).how to represent if the width is different...for example 1 from 10-20 and the odr from 35-60...plz do reply...

[the cyclist]

If you want bars of different widths, you are going to either (a) use handle graphics (as I mentioned in the last sentence of my answer above), or (b) use the "fill" command as Jarrod described in his answer.

You can get the x-coordinates of the bars using the command

>> get(get(hb,'Children'),'XData')

after you have run my code above. Then you can use the "set" command to set new ones. It might be a little overwhelming the first time you try, but this is a very powerful way of having control over every element of the plots. It is very useful to learn about handle graphics.

There is exhaustive info here:

<http://www.mathworks.com/support/tech-notes/1200/1205.html>

[Sumit]

Thank you for the help but i hv sorted out a another way of arranging the bar width...but i hv one more prob...which is as follows:

I m drawing a bar graph, "figure1" and after executing certain no of codes i want to draw a new bar graph in a different figure.But in my case i m using "Hold off" which is resulting a new figure which is replacing the old one in the figure "figure1"....how do i draw a separate figure..say "figure2"...keeping the old one "figure1" unchanged..

[the cyclist]

You should probably have asked this in a separate question, but what you want is the "figure" command, which will open a new figure. (You might want to read the help file for that command.)

[Schamun]

i have used the codes stated here, i was wondering how i can change the colors of the bar graphs. i have leftBarCenter = 5; middleBarCenter = 10; rightBarCenter = 15; leftBarCenter1 = 20; middleBarCenter1= 25; rightBarCenter1 = 30; leftBarCenter2 = 35; middleBarCenter2= 40; rightBarCenter2 = 45; how can i change the colors so dat all the left bars will be in one color, all middlebars in another color, and all the right bars in another color?

Answer 2

[Jarrod Rivituso]

Some thoughts I had...

Have you tried barh?

>> barh([15 45])

That will cause the bars to start from x=0, which may not be what you want based on your description.

You always have the opportunity to get low-level using the fill function. Here is an example:

>> axes;
>> hold on;
>> x = [10 10 20 20];
>> y = [0.8 1.2 1.2 0.8];
>> fill(x,y,'r')
>> x = [40 40 50 50];
>> y = [1.8 2.2 2.2 1.8];
>> fill(x,y,'g')
>> xlim([0 60])
>> ylim([0 3])

Hope this helps!

[Sumit]

barh would produce horizontal bars which i dont want ...i want vertical bars.