basic ploting histogram with a label

I am ploting a histo gram which looks like the figure included my questions are

1.how can I replace 1,2 and 3 with labels A1, D1 & g3?

2.how to chose the distance between two towers?

Answer 1

[dpb]

1) set(gca,'xtick',[1.1 1.9 2.9],'xticklabel',{'A1','D1','G3'})

NB: x values based on observed midpoints in figure

2) Define an x vector as well as counts for the plot to place where wanted, and/or modify x-axis limits

[mausam]

thank you dost

[dpb]

You're welcome...thought just came to me you may also want to experiment with the optional 'width' property--it modifies the bar spacing/width, too.