How to draw a bar chart?

[utkarsh-2000]

Hello everyone,

I have a long list of integers from the values 1, 2, 3, and 4.

I try plotting a histogram of the data using.

TH1* h_mult = new TH1I("h_mult", "Multiplicity", 5, 0, 5);

Then use the baroption to draw it, `h_mult->Draw(“bar”)

`
However, I cannot control the X-axis values such that the first bar is centered at x =1, the second bar at x =2, the third at x=3, and the fourth at x =4. Also, can only the labels x = 1,2,3 and 4 be displayed and not the intermediate values on the axis?

Can someone please help me in this regard? I think I know that what I am trying to get is a 'bar plot, ’ but I am unable to adjust the X-axis values.

Thanks in advance!

[yus]

@utkarsh-2000

However, I cannot control the X-axis values such that the first bar is centered at x =1, the second bar at x =2, the third at x=3, and the fourth at x =4.

Just change

TH1* h_mult = new TH1I("h_mult", "Multiplicity", 5, 0, 5);

to

TH1* h_mult = new TH1I("h_mult", "Multiplicity", 5, 0-0.5, 5-0.5);

@utkarsh-2000

Also, can only the labels x = 1,2,3 and 4 be displayed and not the intermediate values on the axis?

Sure, just add

h_mult->SetNdivisions(5);

after you have filled your histogram.

[utkarsh-2000]

@yus

h_mult->SetNdivisions(5);

Thanks a lot for the quick solution !

[SapphireShade]

I’ll try the method you suggested. I have slightly different data to process, but I hope the same principle will work for me.