How to count the number of scatter points of each color

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muhammad farttoos
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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采纳的回答

Voss
Voss 2024-6-8 
idx = [S1(num_fixed_nodes+1:num_nodes).node_status]==1;
n_green = nnz(idx);
n_red = nnz(~idx);

更多回答（1 个）

Steven Lord
Steven Lord 2024-6-10
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.

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