How to count the number of scatter points of each color

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muhammad farttoos 2024-6-8

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回答： Steven Lord 2024-6-10

I have make a code that do the scatter points in a graph, but i need to find the number of scatter points of each color? i have attached the sample code and graph for explaintion

 for h=num_fixed_nodes+1:1:num_nodes
            %Generate random nodes within the region
            S1(h).xd = position_region(i,1) + rand(1,1)*region_width;
            S1(h).yd = position_region(i,2) + rand(1,1)*region_height;
            S1(h).G=0;
            S1(h).id=h;
            S1(h).type='N';
            S1(h).temp = interp2(aa1,bb1,temp_values_1,S1(h).xd,S1(h).yd);
            S1(h).E=Eo*rand(1,1);
            Et=Et+S1(h).E;
            S1(h).node_status = S1(h).temp<thresh_temp;
            if(S1(h).node_status==1)
                scatter(S1(h).xd,S1(h).yd, 'filled','MarkerFaceColor','g');
            else
                scatter(S1(h).xd,S1(h).yd, 'filled','MarkerFaceColor','r');
            end
 end
 
 

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Answer 1

Voss 2024-6-8

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idx = [S1(num_fixed_nodes+1:num_nodes).node_status]==1;
n_green = nnz(idx);
n_red = nnz(~idx);

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muhammad farttoos 2024-6-10

Thank you for your answer it solved my prolem

Voss 2024-6-10

You're welcome! Any questions, let me know. Otherwise, please "Accept" this answer. Thanks!

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Answer 2

Steven Lord 2024-6-10

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Rather than creating one scatter plot for each individual point, I'd use that loop to create a vector of data that indicates in which color each point should be plotted then call scatter once after the loop is complete, passing that vector in as the c input argument. In that case you could use the groupcounts function to count how many elements of each color are in c.