Histrogram/bar chart plot problem

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

Answer 1

[Scott MacKenzie]

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']});

[surawut.A]

appreciate that, thank you very much

[surawut.A]

can I ask 1 more question please,

from your code, how to do a errorbar?

[Scott MacKenzie]

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]

big thank to you again, I really new to this program.

[surawut.A]

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.

[Scott MacKenzie]

yErr = repmat(0.0001,4,3);

[surawut.A]

I found that I didnt put b = bar 2 4 6

it really a small mistake.

but anyway thank you for helping.