Specify Square Marker in a Plot

For a plot like below:

X = (1:25);
Y = [2 1 2 2 2 3 1 4 3 2 1 2 3 7 11 8 5 2 3 4 5 8 5 5 7];
fig1 = figure();
set(fig1,'color','white')
plot(X,Y,'-s',...
    'LineWidth',2,...
    'MarkerSize',10,...
    'MarkerEdgeColor','r',...
    'MarkerFaceColor',[0.3,0.3,0.3])

How can I specify a red square marker only for the points with Y value equal or bigger than 8, and for the rest a blue square? So for the figure above, I want the square markers at points with X value of 15, 16 and 22 to be red and the rest to be blue. Thank you!

[Jeffrey Clark]

@MarshallSc, plot the line ('-') separate from the points, then with hold on do two plots of only the marker ('s'). one where X(Y>8) and Y(Y>8) and the other X(Y<=8) and Y(Y<=8). Using something like selected = Y>8 you can then use selected and ~selected in the X and Y plot selections.

Answer 1

[Voss]

You can break it up into multiple lines:

X = (1:25);
Y = [2 1 2 2 2 3 1 4 3 2 1 2 3 7 11 8 5 2 3 4 5 8 5 5 7];
fig1 = figure();
set(fig1,'color','white')

plot(X,Y,'-',...
    'LineWidth',2);
hold on
idx = Y >= 8;
plot(X(idx),Y(idx), ...
    'Marker','s', ...
    'LineStyle','none', ...
    'MarkerSize',10,...
    'MarkerEdgeColor','r',...
    'MarkerFaceColor','r');%[0.3,0.3,0.3])
plot(X(~idx),Y(~idx), ...
    'Marker','s', ...
    'LineStyle','none', ...
    'MarkerSize',10,...
    'MarkerEdgeColor','b',...
    'MarkerFaceColor','b');%[0.3,0.3,0.3])