How can a single line plot have two colors?
11 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
Tunde Adubi
am 24 Jul. 2023
Kommentiert: Star Strider
am 24 Jul. 2023
using x and y variables to make a single graph or line plot, how can the plot have two colors or more than one color?
This plot comes out black. How can the interval in the plot attached be red?
figure('position',[100 100 900 550])
hold on
plot(range,s_attenuation,'black', 'LineWidth', 1.5)
ylabel('Specific Attenuation (dB/km)')
xlabel('Range (km)')
title('Line plot')
0 Kommentare
Akzeptierte Antwort
Star Strider
am 24 Jul. 2023
Use ‘logical indexing’:
figure
imshow(imread('plot.JPG'))
title('Original Function')
range = linspace(0,100,500);
s_attenuation = exp(-(range-46).^2/5) + 2*exp(-(range-47).^2/50);
Lv = s_attenuation >= 1.1; % Logical Vector
figure
plot(range, s_attenuation, 'b')
hold on
plot(range(Lv), s_attenuation(Lv), 'r')
hold off
grid
.
2 Kommentare
Star Strider
am 24 Jul. 2023
I assume you intend 1.1 on the left side and 1.5 on the right. In this example, that requires splitting it initially into two segments, then combining them —
range = linspace(0,100,500).'; % Assume Column Vectors
s_attenuation = exp(-(range-46).^2/5) + 2*exp(-(range-47).^2/50);
[~,locs] = max(s_attenuation); % Use 'findpeaks' For More Than One Maximum
locs = [1; locs; numel(range)]; % Augment 'locs' To Include First % Last Indices
v = [1.1; 1.5]; % Values To Comopare
Lv = false(size(range)); % Preallocate
for k = 1:numel(locs)-1
idxrng = locs(k) : locs(k+1); % Index Range For Each Segment
Lv(idxrng) = s_attenuation(idxrng) >= v(k); % Logical Vector
end
figure
plot(range, s_attenuation, 'b')
hold on
plot(range(Lv), s_attenuation(Lv), 'r')
hold off
grid
grid minor
I coded this to be generalisable to more peaks, so that should work, although with some modifications depending on the data. Since each peak would have to be considered separately, creating ‘locs’ would need to take that into consideration. Assuming one peak, this should work without modification.
If I had your data, I could do it with your function.
.
Weitere Antworten (1)
Sam Chak
am 24 Jul. 2023
Hi @Tunde Adubi
If you have the data, and you can find exactly where the two intervals are from scrutizing the data, then you can make the first plot, picking the color hex you like, then retain current plot using 'hold on' when adding another plot. See example below.
You can also use findchangepts() command to find abrupt changes in the signal, if the data has too many points for you to manually scrutize.
% data
x = linspace(0, 1, 1001);
y1 = sin(2*pi*x(1:500));
y2 = sin(2*pi*x(501:end));
% plots
plot(x(1:500), y1, 'linewidth', 2, 'color', '#63c3de'), hold on
plot(x(501:end), y2, 'linewidth', 2, 'color', '#efb255'), hold off
xline(0.5, '--')
% labels
xlabel('x'), ylabel('y')
ylim([-1.5 1.5])
grid on
2 Kommentare
Sam Chak
am 24 Jul. 2023
@Tunde Adubi, Can you check whether the variables in your script are overshadowed by the variables having the same name in your workspace?
Siehe auch
Kategorien
Mehr zu Axis Labels finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!