Drawing different coloured bar plots according to different conditions

Hello =),

I have an excel file that looks something like this:

Participant   A_1    A_2   A_3    A_4    B_1    B_2    B_3    B_4    C_1    C_2    C_3    C_4
1               1      2     1      2     35     40     23     36      0      0      1     1
2               2      1     1      1     80     54     88     25      1      1      0     0

I have 2 subjects (participants). I want to draw different bar plots for each A, B and values separately for each participant. My problem is that I need to provide different colours according to each value of A and C.

When A=1 and C=1, bar plot colour=red,

When A=1 and C=0, bar plot colour=yellow,

When A=2 and C=1, bar plot colour=green,

When A=2 and C=0, bar plot colour=black,

As a result I can have bar plots of A and C separately for each participant with coloured according to variables A and C.

I also want to bar plot variable B with the same colours provided before (according to the same colour numbers 1,2,3 and 4).

So at the end I want to have bar plots of A, B and C for each participant.

Thank you so much. :)

Answer 1

[dpb]

Well, let's see if I parsed this correctly...

data =[
     1     1     2     1     2    35    40    23    36     0     0     1     1
     2     2     1     1     1    80    54    88    25     1     1     0     0];
 P=data(:,1); A=data(:,2:5), B=data(:,[2:5]+4), C=data(:,[2:5]+8);

A = 2×4

1 2 1 2 2 1 1 1

B = 2×4

35 40 23 36 80 54 88 25

 %C={'y','r','k','g'};                          % wished-for colors in order
 NC=[1 1 0;1 0 0;0 0 0;0 1 0];                  % RGB triplets to match
 fnC=@(a,c) (2*(a-1)+c+1);                      % lookup function -- color index as FN(A,C)
 hB=bar(B(1,:),'FaceColor','flat');             % draw a sample bar for one B
 for i=1:size(B,2)                              % set bar colors to lookup value
   hB.CData(i,:)=NC(fnC(A(1,i),C(1,i)),:);      % have to set the CData() property w/ RGB triplet
 end

 ylabel('B Participant 1'); xlabel('Observation')

For the others, mimic the above -- can be written with looping constructs over Participant (row) and also with indexing into larger data array to avoid the multiple variables used here to improve legibility.

You can set any choice of RGB triplets to not be quite so garish as suits...

[Go Sugar]

Thank you so much for the answer..=) It is working, I will try it for the others too..Just one question, how did you write the lookup function?

[dpb]

"...how did you write the lookup function?"

Simply by inspection and ordering the color vector in the specific order to match.

The two variables A,C each vary by one; shifted A to also be 0-1, then the factor of two is the second bit in a 2-bit encoding 0-3; the "+1" produces a valid one-based array index. I deliberately left written as is so can see the two factors rather than simplifying the expression.

[Go Sugar]

It now makes sense, thank you so much for all the help.. =) Have a great day!..