help on some details of scatterplot

I would like that the last graph shows the 4 legends (that I put wrongly). Indeed I don't want any legend for line(Total_Matrix(:,1),Total_Matrix(:,2))

I would like also that the x coordinate on Total_Matrix(12,1) will appear not like a number (that is a number) but like the string 'adults'

Obviously Total_matrix is only a dobule matrix

subplot(3,2,1)
scatter(Total_Matrix(1:4,1),Total_Matrix(1:4,2),'r','filled')
legend '<= 1 y.o' 
hold on
scatter(Total_Matrix(5:11,1),Total_Matrix(5:11,2),'g','filled')
legend '<= 2 y.o.'
scatter(Total_Matrix(12,1),Total_Matrix(12,2),'k','filled')
legend 'adults'
line(Total_Matrix(:,1),Total_Matrix(:,2))
hline = refline([0 0.68]);
legend 'ST ideal' %refers to refline
hline.Color = 'y';
ylabel ST
xlabel AGE

Answer 1

[Image Analyst]

legend(subset,___) only includes items in the legend for the data series listed in subset. Specify subset as a vector of graphics objects. You can specify subset before specifying the labels or with no other input arguments.