Adding more circles to the scatter plot legend
显示 更早的评论
I am using the following code and want to create a legend where different colors correspond to different dosage.
Currently, all the points are marked as the same color in the legend (attached)
dpli_dris = [1,2,3,4]
hub_dris = [1,2,3,3.5]
dosage_order = [1,2,3,4]
dosage = ['1 mcg/kg/min';'3 mcg/kg/min';'4 mcg/kg/min';'6 mcg/kg/min'];
handle = figure;
s=scatter(dpli_dris,hub_dris,[],'b','filled','o','MarkerEdgeColor',[0 0 0])
hold on
s.AlphaData = dosage_order;
s.MarkerFaceAlpha = 'flat';
leg = legend(dosage,'Location','northeastoutside');
What can I do to fix the legend?
Thank you
回答（1 个）
If you want different colors, call the scatter function seperately for each point. Currently, you are assigning the same color blue to all the 4 points in vectors dpli_dris & hub_dris using single scatter call.
dpli_dris = [1,2,3,4];
hub_dris = [1,2,3,3.5];
dosage_order = [1,2,3,4];
dosage = {'1 mcg/kg/min','3 mcg/kg/min','4 mcg/kg/min','6 mcg/kg/min'};
hold on
scatter(dpli_dris(1),hub_dris(1),'b','filled','o','MarkerEdgeColor',[0 0 0])
scatter(dpli_dris(2),hub_dris(2),'r','filled','o','MarkerEdgeColor',[0 0 0])
scatter(dpli_dris(3),hub_dris(3),'g','filled','o','MarkerEdgeColor',[0 0 0])
scatter(dpli_dris(4),hub_dris(4),'m','filled','o','MarkerEdgeColor',[0 0 0])
leg = legend(dosage,'Location','northwest'); grid
3 个评论
Alternate way is to call the scatter function inside the for loop as shown below
dpli_dris = [1,2,3,4];
hub_dris = [1,2,3,3.5];
dosage_order = [1,2,3,4];
dosage = {'1 mcg/kg/min','3 mcg/kg/min','4 mcg/kg/min','6 mcg/kg/min'};
colors = {'b','r','g','m'};
hold on
for k = 1:length(hub_dris)
scatter(dpli_dris(k),hub_dris(k),colors{k},'filled','o','MarkerEdgeColor',[0 0 0])
end
leg = legend(dosage,'Location','northwest'); grid
Miriam Han
2023-6-19
Use MarkerFaceAlpha as you did earlier but with a slight change
dpli_dris = [1,2,3,4];
hub_dris = [1,2,3,3.5];
dosage_order = [1,2,3,4];
dosage = {'1 mcg/kg/min','3 mcg/kg/min','4 mcg/kg/min','6 mcg/kg/min'};
% colors = {'b','r','g','m'};
Alpha = [0.2 0.4 0.6 0.8]
hold on
for k = 1:length(hub_dris)
scatter(dpli_dris(k),hub_dris(k),'b','filled','o','MarkerEdgeColor',[0 0 0],'MarkerFaceAlpha',Alpha(k))
end
leg = legend(dosage,'Location','northwest'); grid
类别
在 帮助中心 和 File Exchange 中查找有关 Legend 的更多信息
2023-6-18
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
