MATLAB: Changing the color of stacking bar plot with many groups

bar

I have a big matrix with size of 28 X 10 and I used bar plot (stacking) to plot them. Now I'm struggling to change the color for all the 28 variables. Any to make them look different so i cant distinguish them.

figure 
students = rand(28,10); 
year     = 2020: 2029; 
bar(year, students, 'stacked') 
legend('A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'Z')

Best Answer

students = rand(28,10); 
year     = 2020: 2029; 
h=bar(year, students, 'stacked') ;
legend('A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'Z')
c=colormap('jet');
pick=round(linspace(1,size(c,1),numel(h)));
c=mat2cell(c(pick,:),ones(1,numel(h)),3);
[h.FaceColor]=deal(c{:});

Related Solutions

MATLAB: How to cipher an input file

dlmread is not for reading text files.The easiest way to import a text file is with fileread.

plik = fileread(fid); %note that using fid as a variable name for a filename is very misleading

Similarly, dlmwrite is not for writing text files. There's no one-line equivalent to fileread unfortunately:

filename = input('name of file to write', 's');
fid = fopen(filename, 'wt');
fprintf(fid, 'Cezar: %s\n', Szyfr);
fprintf(fid, 'Skok %s\n', key);
fclose(fid);

WIth regards to your code:

while key > 26
    key = mod(key,26); 
end

is a pointless loop. If key is greater than 26, the mod guarantees that it will be less than 26 after that regardless of how big it is. If it is less than 26, then the mod wouldn't change it, so the whole lot is simply:

key = mod(key, 26); %no loop needed

I note that later on in your code, you seem to have forgotten about mod.

Finally, I'll leave you with this code:

plain = 'the quick brown fox jumps over the lazy fox!'  %demo text
key = mod(input('Podaj skok:'), 26);
cypher('a':'z') = circshift('a':'z', -key);
encoded = plain;
encoded(isletter(plain)) = cypher(plain(isletter(plain)))

MATLAB: How to explicitly change the colors of the bars in a stacked bar graph

You can use the Color Data (CData) property for bar graph released in R2017b.

You can change the color for a particular bar by setting the FaceColor property to 'flat'. Then, change the corresponding row in the CData matrix to the new RGB triplet. Here is the link for the CData property in bar graph:

https://www.mathworks.com/help/matlab/ref/bar.html#input_argument_namevalue_d119e63137

For example,

a = [1,3,6;2,5,6;8,2,1];
H=bar(a, 'stacked');
colorSet = [];
for i = 1:3
    myColors = round(rand(3,3),1);
    colorSet = [colorSet myColors];
    H(i).FaceColor = 'flat';
    H(i).CData = myColors;
 end
This will display the stacked bar plot with different colors.

Best Answer

Related Solutions

MATLAB: How to cipher an input file

MATLAB: How to explicitly change the colors of the bars in a stacked bar graph

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