plotting values greater than threshold

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shobhit mehrotra
shobhit mehrotra 2014 年 8 月 12 日
コメント済み: ishbish 2018 年 2 月 19 日
im trying to plot values greater than a threshold in a different color. for example i want to plot values greater than 100 in the image in red

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Image Analyst
Image Analyst 2014 年 8 月 12 日
% Create sample data.
y = randi(160, 1, 40); % Array of random numbers
x = 1 : length(y);
% Plot everything with blue spots and blue lines between them.
plot(x, y, 'bo-', 'LineWidth', 2, 'MarkerSize', 7);
grid on;
% Now define a threshold.
threshold = 100;
moreThanThreshold = y > 100; % Logical indexes.
% Extract those over the threshold into new arrays.
over_x = x(moreThanThreshold);
over_y = y(moreThanThreshold);
% Now plot those over 100 with red stars over the first set of points.
hold on; % Important so you don't blow the first plot away.
plot(over_x, over_y, 'r*', 'LineWidth', 2, 'MarkerSize', 13);
  3 件のコメント
ishbish
ishbish 2018 年 2 月 19 日
I ultimately decided to apply a rotation matrix to my data and then just do it as described above, much easier! Thank you for the advice though.

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