plotting points with different colors

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Diego Soler Polo
Diego Soler Polo 2016 年 4 月 22 日
コメント済み: J. Webster 2016 年 4 月 23 日
Hi,
I have a MxM matrix RegionsMap whose components are integer numbers between 1 and 4. The element RegionsMap(k,j) represents a point in the complex plane, x(k)+i*y(j) (x and y are vectores I previously defined). I want to plot every one of these complex numbers in the complex plane in such a way that: If RegionsMap(k,j) is 1 I color the associated point in blue, if it is 2 I color the associated point in red,...etc (green and yellow for 3 and 4).
How can I achieve this? Any help will be appreciated! Thanks

回答 (2 件)

J. Webster
J. Webster 2016 年 4 月 22 日
something like this maybe?
RegionsMap = randi([1 4],10,10);
x = rand(1,10);
y = rand(1,10);
figure(10);
hold on;
for i=1:10
for j=1:10
switch RegionsMap(i,j)
case 1
plot(x(i),y(j), 'ob');
case 2
plot(x(i),y(j), 'or');
case 3
plot(x(i),y(j), 'og');
case 4
plot(x(i),y(j), 'oy');
end
end
end
hold off;
  2 件のコメント
J. Webster
J. Webster 2016 年 4 月 23 日
to fill in the circle, you can replace the plot command with
scatter(x(i),y(i), 'og', 'filled')
If you know there will be at most 10 possibilities, you could just define 10 different cases.
Or you could do like Walter Roberson noted and define a colormap.

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Walter Roberson
Walter Roberson 2016 年 4 月 23 日
scatter() fourth parameter can be a vector of values. Create a colormap with as many entries as values you have. caxis([1,n]) where n is the number of entries. Now value K will be drawn with color from entry #K

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