Plot out of cell array with attributes

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Maier am 18 Nov. 2016

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Kommentiert: Maier am 23 Nov. 2016

Hi, at first here is my code:

x = zeros(1979,1);
y = zeros(1979,1);
B = cell(1979,1);
for i = 1 : 1979
  x(i) = i;
  y(i) = i;
  if i > 150
      B(i,1) = {'bs'};
  else
      B(i,1) = {'ks'};
  end
end
plot(x,y,B(:));

so the x vector contains my x-coordinates and the y-vector my y-coordinates. Now for example I want to plot the first 150 as a blue square and the others should be a black square.

I now that I can do it with a for-loop but in my real case the attributes depend on a a lot of things. So I want to create a cell array which contains the color and the appearance of the marker for each coordinates and to plot it automatically without a for-loop.

I hope you understand what I want to do :)

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Image Analyst am 23 Nov. 2016

I didn't say call scatter hundreds of times to plot hundreds of points point-by-point. I'm saying call it twice. However if you need a custom, unique, totally different pop-up context menu for every single one of the points, instead of one context menu that applies to any/all points, then I don't know - I've never done that before and doubt I'll ever need to do it in the future either. I can't envision any scenario where you'd need a different "context menu which is individual for every point."

Maier am 23 Nov. 2016

Ok anyway thank you.

I'm writing a script to visualize the power flow solutions of an european electrical transmission grid. Every point is a substation of the grid and the context menu contains Information about it (e.g. voltage, name,...) which is individual for every point. Also the markerstyle and color depends from point to point. I'm doing it with a context menu because it gets a lot messy if I would do it any other way.

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Nick Counts am 19 Nov. 2016

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Bearbeitet: Nick Counts am 19 Nov. 2016

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I think you are looking for gscatter, which allows you to define a "group vector" and then define different styles for each group. It works sort of like logical indexing. There is good documentation, but here is an example:

    x = 1:1979;
    y = 1:1979;
    % Make the group vector. 
    % The first 150 points are group 1
    % The rest are group 2
    group(1:150) = 1;
    group(151:1979) = 2;
    % The colors are assigned blue to 1, black to 2
    % The marker styles are square to 1, circle to 2
    gscatter(x, y, group, 'bk', 'so')