Creating a Multi Bar Plot in Matlab with Zeros and Proper Legends?

[madtraveller]

Homework Statement

I have a 6 x 16 data frame "y" which stands for 16 different soil types at 6 different depth as followings

0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
0	0	0	0	0	0.37	0	0	0.50	0	0.03	0.03	0	0	0.02	0.05
0	0	0	0	0	0.26	0	0	0.34	0	0.02	0.02	0	0	0.33	0.03
0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
0	0	0	0	0	0.06	0	0	0	0	0	0	0	0	0.94	0

Homework Equations

I'd like to create a multi bar graph which has 16 columns (soil type) and each column has another 6 sub column(6 soil depths). But it seemed that Matlab didn't like zeros value, thus it didn't plot it and I couldn't create a proper legend for it

The Attempt at a Solution

figure;
% Legend for x-axis
soilType = {'S', 'LS', 'SL', 'SIL', 'SI', 'L', 'SCL',...
            'SICL', 'CL', 'SC', 'SIC', 'C', 'OM', 'W', 'BR', 'O'};
% Characteristics for legend
soilDepth = {'0-10cm', '0-100cm', '0-150cm', '10-40cm', '40-100cm', '100-150cm'};
bar(y, 'group') 
set(gca, 'XTickLabel', soilType);
xlabel('Soil Type');
ylabel('Areal Fraction')
legend(soilDepth, 'Location', 'Northwest')

Any suggestion will be very appreciated. Thx

madtraveller

 

[gb7nash]

Take a look at this:

http://www.mathworks.com/help/techdoc/ref/bar.html

Assuming that your matrix is called yMat, you can use:

figure;
bar(yMat);

If that doesn't work, take a look at this:

http://compgroups.net/comp.soft-sys...-on-a-Bar-Graph-with-different-x-and-y-values

From what I got from that, you can create the following vectors: X = <1,2,..,16>, Y1, Y2, Y3, Y4, Y5, and Y6 (where each Y is a row). Then you can use:

bar(X,Y1)
hold on;
bar(X,Y2)
hold on;
.
.
.
bar(X,Y6)

and this should superimpose the bar graphs. The first method should work though.

 

[madtraveller]

Hi gb7nash,

The first suggestion is kind of identical to what I did and it didn't work
The second one didn't help either because what I need is to have 6 rows plotted beside each other with 6 different colors (16 columns x 6 color). In the end I will create a legend indicating 6 different color (soil depth)

Thx anyway

madtraveller

 

[madtraveller]

Dear all,

I still need help with this. The legend didn't display correctly with the above code and Matlab just plot the columns having non-zeros value instead of plotting all 16 columns

Thx in advanced

madtraveller

 

[MATLABdude]

Maybe you could put a really small value in each column of one row? For instance, putting 0.001 instead of 0 for all the entries in the first row?

>> data(1,:)=0.001

A hack, but maybe just good enough to make your graph for you.

 

[madtraveller]

Hello MATLABdude,

I've just found out that you don't have to put small values at all. I just transpose my data frame "y" like this and it works nicely

bar(y', 'group')

However, the xlabel on x-axis still didn't display the way I want. Do you know a way to force all the labels show up on x-axis?

Thx