Histrogram/bar chart plot problem

2022 3 5
1 个回答
回答已采纳
更新时间：2022 3 13
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i'm trying to plot a Histrogram with a data I got from working
%----------------------------------------------------------------
%
%--------------------------------------------------------------
filename = 'Mass_change_forMatlabNew.xlsx';
readdata = xlsread(filename);
X1 = (15) ;
X2 = (30) ;
X3 = (45) ;
Y1 = readdata(:,2) ;
Y2 = readdata(:,4) ;
Y3 = readdata(:,6) ;
%-------------------------------------------------------------------
%
%-----------------------------------------------------------------
Hist(X1,Y1)
Hist(X2,Y2)
Hist(X3,Y3)
data I have from lab
800 Celcius 700 Celcius 600Celcius
15percentage Carbon 0.000709 0.00015 0.000161
30percentage Carbon 0.000375 0.000261 0.00042
45percentage Carbon 0.002765 0.000344 0.000724
data I'm putting in excel (imagine it has a box)
filename Mass_change_forMatlabNew
15 0.000709 30 0.00375 45 0.002765
15 0.00015 30 0.000261 45 0.000344
15 0.000161 30 0.00042 45 0.000724
a picture above is a graph that i want
Y axis is a mass grain
X axis is a percentage Carbon
and show on a top right like 1st box is a 600, 2nd is a 700 and 3rd is a 800
big thank to everyone

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Scott MacKenzie
Scott MacKenzie 2022-3-5
编辑：Scott MacKenzie 2022-3-5
Ran in:

0 个投票

Ran in:
The code below uses your data and generates a bar chart similar to your sketch. I'm not sure how picky you are about the colors. The bar colors below are MATLAB's default.
% data from question
M = [15, 0.000709, 30, 0.00375, 45, 0.002765
15, 0.00015, 30, 0.000261, 45, 0.000344
15, 0.000161, 30, 0.00042, 45, 0.000724];
bar(M(:,[2 4 6])');
set(gca, 'XTickLabel', string(M(1,[1 3 5])));
xlabel('Percent Carbon');
ylabel('Mass Grain');
legend({['800' char(176) 'C'], ['700' char(176) 'C'], ['600' char(176) 'C']});

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surawut.A
surawut.A 2022-3-5
appreciate that, thank you very much
surawut.A
surawut.A 2022-3-9
can I ask 1 more question please,
from your code, how to do a errorbar?
Scott MacKenzie
Scott MacKenzie 2022-3-9
编辑：Scott MacKenzie 2022-3-9
Ran in:
Ran in:
You're welcome. Glad to help. Here's the same code with error bars added:
% data from question
M = [15, 0.000709, 30, 0.00375, 45, 0.002765
15, 0.00015, 30, 0.000261, 45, 0.000344
15, 0.000161, 30, 0.00042, 45, 0.000724];
b = bar(M(:,[2 4 6])');
set(gca, 'XTickLabel', string(M(1,[1 3 5])));
xlabel('Percent Carbon');
ylabel('Mass Grain');
legend({['800' char(176) 'C'], ['700' char(176) 'C'], ['600' char(176) 'C']});
% add error bars
hold on;
xx = [b(1).XEndPoints; b(2).XEndPoints; b(3).XEndPoints];
yy = [b(1).YData; b(2).YData; b(3).YData];
yErr = repmat(0.0001,3,3); % test data for error bars
eb = errorbar(xx, yy, yErr, yErr, 'linestyle', 'none', 'color', 'k', 'linewidth', .8);
set(eb, 'HandleVisibility', 'off');
surawut.A
surawut.A 2022-3-9
big thank to you again, I really new to this program.
surawut.A
surawut.A 2022-3-13
sorry again
%------------------------------------------------------
%
%
%------------------------------------------------------
M = [15, 0.000765891, 30, 0.000466818, 45, 0.000770541
15, 0.000709, 30, 0.00375, 45, 0.002765
15, 0.00015, 30, 0.000261, 45, 0.000344
15, 0.000161, 30, 0.00042, 45, 0.000724];
bar(M(:,[2 4 6])');
set(gca, 'XTickLabel', string(M(1,[1 3 5])));
xlabel('%Carbon Monoxide Content');
ylabel('Mass Grain');
legend({['900' char(176) 'C'], ['800' char(176) 'C'], ['700' char(176) 'C'], ['600' char(176) 'C']});
%------------------------------------------------------
% add error bars
%
%------------------------------------------------------
hold on;
xx = [b(1).XEndPoints; b(2).XEndPoints; b(3).XEndPoints; b(4).XEndPoints];
yy = [b(1).YData; b(2).YData; b(3).YData; b(4).YData];
yErr = repmat(0.0001,3,3); % test data for error bars
eb = errorbar(xx, yy, yErr, yErr, 'linestyle', 'none', 'color', 'k', 'linewidth', .8);
set(eb, 'HandleVisibility', 'off');
i add 1 more data at 900C
a graph are running but a code error at error bar
please.
surawut.A
surawut.A 2022-3-13
I found that I didnt put b = bar 2 4 6
it really a small mistake.
but anyway thank you for helping.

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