# I need to plot a histogram

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FURKAN CEVAHIR on 24 Jan 2018
I tried to plot it with the excel, but excel is giving size range as the same size columns. Columns width is not supposed to be the same. So, I changed the program and decided to plot this histogram on the Matlab.
Can you help me to plot that histogram?
Size Interval (um)
0-0.2
0.2-0.4
0.4-0.6
0.6-0.8
0.8-1.0
1.0-1.2
1.2-1.4
1.4-1.6
1.6-1.8
1.8-2.1
2.1-2.7
2.7-3.6
3.6-5.1
and
Number of particle in interval per cm-3 of air
10
80
132
142
138
112
75
65
52
65
62
32
35

Star Strider on 24 Jan 2018
This may do what you want.
The Code
edges = [0 : 0.2 : 1.8, 2.1, 2.7, 3.6, 5.1];
vals = [10 80 132 142 138 112 75 65 52 65 62 32 35];
V1 = [vals' diff(edges')];
V1L = [0; cumsum(V1(:,2))]; % Cumulative Lengths
figure
for k1 = 1:size(V1,1)
patch([0 1 1 0]*V1(k1,2)+V1L(k1),[0 0 1 1]*V1(k1,1), rand(1,3), 'LineWidth',0.1)
end
hold off
axis([min(edges) max(edges) 0 max(ylim)])
set(gca, 'XTick',V1L, 'FontSize',8)
I chose random colours. Experiment to get the result you want.
The Plot
Peyman Mostafaei on 9 Mar 2021
In addition to this answer, there is another way which uses the command bar instead of patch.
You have to know that the default width in the bar command is 1. All you have to do is to create your plot for each element of data separately based on this fact through a for loop.
edges = [0 : 0.2 : 1.8, 2.1, 2.7, 3.6, 5.1];
vals = [10 80 132 142 138 112 75 65 52 65 62 32 35];
center = (edges(1:end-1) + edges(2:end))/2;
width = diff(edges);
hold on
for i=1:length(center)
bar(center(i),vals(i),width(i),'b')
end
hold off

Steven Lord on 13 Jul 2018
E = [0, 0.2, 0.4, 0.6, 0.8, 1.0, 1.2, 1.4, 1.6, 1.8, 2.1, 2.7, 3.6, 5.1];
C = [10, 80, 132, 142, 138, 112, 75, 65, 52, 65, 62, 32, 35];
histogram('BinCounts', C, 'BinEdges', E)

Walter Roberson on 24 Jan 2018
edges = [0 : 0.2 : 1.8, 2.1, 2.7, 3.6, 5.1];
vals = [10
80
132
142
138
112
75
65
52
65
62
32
35];
centers = (edges(1:end-1) + edges(2:end));
bar(centers, vals)
set(gca, 'xtick', centers)
If you need the bars to be variable width (the full width of their bin) then more work is required, as bar() does not support that.

FURKAN CEVAHIR on 24 Jan 2018
Edited: FURKAN CEVAHIR on 24 Jan 2018
Thank you. But I need the bars which show variable widths according to the size intervals. How can I do that?

FURKAN CEVAHIR on 24 Jan 2018
Edited: FURKAN CEVAHIR on 24 Jan 2018
Great! Thank you so much. What if I want to plot X axis on logarithmic scale like that, Size Intervals (um) ln 0.0 - ln 0.2 ln 0.2 - ln 0.4 ln 0.4 - ln 0.6 ln 0.6 - ln 0.8 ln 0.8 - ln 1.0 ln 1.0 - ln 1.2 ln 1.2 - ln 1.4 ln 1.4 - ln 1.6 ln 1.6 - ln 1.8 ln 1.8 - ln 2.1 ln 2.1 - ln 2.7 ln 2.7 - ln 3.6 ln 3.6 - ln 5.1
Star Strider on 24 Jan 2018
As always, my pleasure!
Add 'XScale' to the set call:
set(gca, 'XTick',V1L, 'FontSize',6, 'XScale','log')

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