Scatter Diagram with colorbar

Question

Philipp Mueller 2016-9-15

0
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https://ww2.mathworks.cn/matlabcentral/answers/303133-scatter-diagram-with-colorbar

评论： Adam 2016-9-15

What is the best solution/way to create a very simple scatter diagram with a colorbar.

My input should be a .txt file with 3 columns -> x - coordinate, y - coordiante and value for filling the dots with color. I have found a simple code but the color information is a little bit different.

I want this color input "colors = [212 34 45 12 5]" not colors = ['r' 'g' 'b' 'y' 'c']. Is an other code better? Thank you.

X = [1 2 3 8 1]
Y = [5 4 5 1 5]
%color = [212 34 45 12 5]
fig = figure;
colors = ['r' 'g' 'b' 'y' 'c']
hold on;
for i=1:5
    scatter(X(i), Y(i), 'LineWidth',10,'MarkerFaceColor',colors(i))
end
hold off;
resp = fig2plotly(fig)
plotly_url = resp.url;

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Adam 2016-9-15

What are those colour values supposed to represent? Are they indices into some colourmap? Otherwise colour must be represented as an RGB triplet.

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Answer 1

KSSV 2016-9-15

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https://ww2.mathworks.cn/matlabcentral/answers/303133-scatter-diagram-with-colorbar#answer_234845

在 MATLAB Online 中打开

You can use RGB color code, like for Red [255 0 0], Green [0 255 0] and Blue [0 0 255] ;

%Force vs Time Different plate angle 
X = [1 2 3 8 1] ;
Y = [5 4 5 1 5] ;
%color = [212 34 45 12 5]
fig = figure;
% colors = ['r' 'g' 'b' 'y' 'c'] ;
colors = [255 0 0 ; 0 255 0 ; 0 0 255 ;255 255 0 ;160 160 160] ;
hold on;
for i=1:5
    scatter(X(i), Y(i), 'LineWidth',10,'MarkerFaceColor',colors(i,:)/255)
end