Plot RGB triplets from a matrix as markers 'o'

13 次查看（过去 30 天）
Stylianos
Stylianos 2025-2-7
评论： Stylianos 2025-2-10
Ran in:
I have a matrix B 6-by-3. I want using a for loop to plot six different coloured markers 'o' in the same figure and in one line (y=0).
Each row has 3 elements of 0 and 1 representing RGB triplet colors.
My code is:
% Define axis limits
x = linspace(0,10,10);
y = linspace(0,10,10);
xlabel('X-axis');
ylabel('Y-axis');
axis([0 10 0 10]);
B =[1 0 0
0 1 0
1 0 1
0 1 1
0 0 1
0 0 1];
for k=1:6
VW = B(k,:);
plot((VW),'o','LineWidth',5);
hold on
end
hold off
I get the following figure with wrong colors
Any help is appreciated.
Thanks a lot.
Stelios Kas.

请先登录，再回答此问题。

回答（2 个）

Cris LaPierre
Cris LaPierre 2025-2-7
编辑：Cris LaPierre 2025-2-7
Ran in:
Your plot command is adding 3 points each time. Try this. It specifies a unique x location for each row of C, and colors the marker using the RGB combo for that row. Y=0 for all 6 points.
Note that the order of your commands matters when formatting the appearance of the figure, since calling plot with the syntax you use creates a new axis.
% Define axis limits
C =[1 0 0
0 1 0
1 0 1
0 1 1
0 0 1
0 0 1];
scatter(1:size(C,1),0,[],C,'filled');
xlabel('X-axis');
ylabel('Y-axis');
axis([0 10 0 10]);
  3 个评论
显示 1更早的评论
Cris LaPierre
Cris LaPierre 2025-2-7
Ran in:
Ah, you are probably using a slighly older version of MATLAB. Here's updated code.
% Define axis limits
C =[1 0 0
0 1 0
1 0 1
0 1 1
0 0 1
0 0 1];
scatter(1:size(C,1),zeros(1,size(C,1)),[],C,'filled');
xlabel('X-axis');
ylabel('Y-axis');
axis([0 10 0 10]);
Stylianos
Stylianos 2025-2-7
Thank you very much Chris.
Now it works, I use Matlab 2019b.
Much obliged.
Stelios Kas

请先登录，再进行评论。

Fangjun Jiang
Fangjun Jiang 2025-2-7
编辑：Fangjun Jiang 2025-2-7
Ran in:
Use 'color' to specify color in plot()
x = linspace(0,10,10);
y = linspace(0,10,10);
xlabel('X-axis');
ylabel('Y-axis');
axis([0 10 0 10]);
B =[1 0 0
0 1 0
1 0 1
0 1 1
0 0 1
0 0 1];
for k=1:6
VW = B(k,:);
plot((VW),'o','LineWidth',5,'color',VW);
hold on
end
hold off
  3 个评论
显示 1更早的评论
Fangjun Jiang
Fangjun Jiang 2025-2-7
Ran in:
Yes. I only provided answer regarding 'color'. Didn't pay attention to what needs to be plotted. Can still use plot() to do it.
axis([0 10 0 10]);
B =[1 0 0
0 1 0
1 0 1
0 1 1
0 0 1
0 0 1];
for k=1:6
VW = B(k,:);
plot(k,0,'o','LineWidth',5,'color',VW);
hold on
end
●
Stylianos
Stylianos 2025-2-10
Dear Jiang.
The code works fine.
Thank you very much.
Much obliged.
Stelios Kas

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Polar Plots 的更多信息

标签

产品


版本

R2019b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by