MATLAB: How to make this plot

arraysboolean variableshistogramlogical?MATLABmatrixplot

Hello everyone, thanks in advance for your time and help! I'm going to expose my situation:
I've got a logical matrix, of dimensions, let's say, (P,T). For istance:
    P=4;
    T=3;
    M=[1 1 0 0 ;1 1 1 0; 1 0 0 0];
I should make a plot on the plan of axis T (x-axis) and P (y-axis), as it follows. For each fixed T, i should obtain a vertical bar which stands from P=1 to P=4. This bar should be a two-tone bar: it should be composed of a red-colour part, as extended as the number of values 1 occurring in the correspondant column of the matrix M. The remaining segment should be green, as extended as the number of values 0 occurring in the correspondant column of the matrix.
For istance, fixed T=1, i should get a red line from P=1 to P=2 and a green line for the remaining values of P; fixed T=2, i should have a red line from P=1 to P=3 and a green part for P=4, and so on.
Substantially, i need to repeat this for each T ( i fix the column of the matrix and plot P-values for that column) and put all the vertical lines in the same plot ( should i use hold on ?). The red lines' length should be equal to the number of 1 values occurring in the columns. The green lines' length should be equal to the number of 0-values (remaining values) occurring in the columns.
I've been trying a lot, but can't get which should be the right plot function to be used. Thank You for helping me!

Best Answer

Hi Stefano,
Is this what you are trying to do?
if yes then this is the code:
P=4;
T=3;
M=[1 1 0 0 ;1 1 1 0; 1 0 0 0];
myData = sum(M,2);
dataToPlot = [myData, size(M,2)-myData];
figure();
handle_bar = bar(dataToPlot, 'stacked');
handle_bar(1).FaceColor = 'r';
handle_bar(2).FaceColor = 'g';
xlabel('T')
ylabel('P')
The trick is to create a matrix with T lines and 2 columns, the first column stores the number of ones in your M matrix and the second column stores the number of zeros in M (or, as in my code, the difference between the second dimension of M (which is 4) and the number of ones). You then plot everything using the bar function, specifying that you want the columns of "myData" to be stacked. Then you use the created handle (handle_bar) to access the FaceColor of the first column (in red) and the second column (in green).
Best, Sandro
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