Bar Graph from a table : Error Xdata must be unique

A B C

0 '0' 2

0 '1' 11

1 '0' 32

1 '1' 33

2 '0' 38

2 '1' 31

3 '0' 47

3 '1' 39

Want to have C on the Y axis, X axis : 0,1,2,3 , bars colored for B : 0,1.

[Adam Danz]

Welcome to the forum @Frederick Awuah-Gyasi.

As the error message indicates, you have multiple x-values so Matlab doesn't know what to do with it, and neither do we 🙂.

Do you want 2 sets of bar plots?

Do you want to somehow combine the Y data for the same x-data groups?

Something else?

[Frederick Awuah-Gyasi]

@Cris LaPierre This is what I treid b = bar(T.A,T.C) not sure how to pass in T.B.

@Adam DanzI want it grouped B grouped by A on the x axis all using the same Ydata.

[Frederick Awuah-Gyasi]

Thanks for your help @Cris LaPierre and @Adam Danz

[Frederick Awuah-Gyasi]

A little background :This dataset is a subset of a bigger table got with this code below:

T = groupsummary(BigT,{'A','B'}) so C is the GroupCount

Answer 1

[Cris LaPierre]

For bar, groups are created organizing the data into a matrix. The rows correspond to x, and the columns correspond to each data series. See this example.

That means you will need to do some reorganizing of the data to get it formatted correctly to create a grouped bar chart.

% Set up the problem by recreating the table.
A = [	0	0	1	1	2	2	3	3]';
B = ['0'	'1'	'0'	'1'	'0'	'1'	'0'	'1']';
C = [2	11	32	33	38	31	47	39]';

T = table(A,B,C);

% use sortrows to organize data in an expected format
T = sortrows(T,["B","A"]);
% extract x values, group names
x = unique(T.A);
b = unique(T.B);
% Reshape the data based on the number of unique values in A
CC = reshape(T.C,length(x),[])

CC = 4×2

2 11 32 33 38 31 47 39

% plot
bar(x,CC)
legend(b)

[Frederick Awuah-Gyasi]

@Cris LaPierre Really do appreciate your quick response and break down of answers. Looking forwarded to be able to contribute to this forum like you.

[Adam Danz]

@Frederick Awuah-Gyasi, I'm looking forward to your contributions!

[Frederick Awuah-Gyasi]

@Adam Danz challenge accepted.