I want to change the color of markers in scatter plot which are greater than the specified values but I am facing difficulty
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I have the following code
But it keeps giving me the following weer
clc
clear
close all
d = 4;
N = 1000;
X = linspace(0,d,N);
func = @(X) 2*X.*cos(X.^2).*exp(sin(X.^2)) + 14;
limit = func(X);
x = 4*rand(1,N);
y = 25*rand(1,N);
figure(1),hold on
h = scatter(x,y,10,'markerfacecolor','b');
plot(X,limit,'k-','linew',1.3)
for i = 1:N
if any(y(i) < limit)
set(h,'YData','MarkerFaceColor','r','Markeredgecolor','r')
end
end
But it keeps giving me the following error
Error using matlab.graphics.chart.primitive.Scatter/set
Invalid parameter/value pair arguments.
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回答 (2 件)
Walter Roberson
2022 年 4 月 11 日
set(h,'YData','MarkerFaceColor','r','Markeredgecolor','r')
It is possible to set YData of a scatter plot, and doing so successfully would change the Y coordinates of the markers. However, the new coordinates need to be the same kind of data as the original Y coordinates; double precision in your code. Instead, your code is trying to change the Y coordinates to instead be the character vector ['M' 'a' 'r' k' 'e' 'r' 'F' 'a' 'c' 'e' 'C' 'o' 'l' 'o' 'r']
I suspect you thought you were doing something like
set(h,'YData', y(i), 'MarkerFaceColor','r','Markeredgecolor','r') %NOT GOING TO WORK
with the intended meaning that you wanted to change the face color and edge color for the i'th point.
I would suggest
mc = repmat([0 0 1], N, 1);
h = scatter(x, y, 10, mc, 'MarkerEdgeColor', 'flat');
for i = 1:N
if y(i) < limit(x(i))
h.CData(i,:) = [1 0 0];
end
end
But if I were doing it for myself, I would vectorize the calculation and build the mc color array once, like
mask = y < limit(x);
mc = repmat([0 0 1], N, 1);
mc(mask,1) = 1; mc(mask,2) = 0; mc(mask,3) = 0;
h = scatter(x, y, 10, mc, 'MarkerEdgeColor', 'flat');
and that should build the plot the right way the first time, without needing to adjust the markers afterwards
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