how to plot a gaussian 1D in matlab
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for k = 1 : K
ax = linspace(min_x,max_x,100);
y = my_gaussian(x,means,vars);
plot(ax,y);
end
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Accepted Answer
M
on 1 Dec 2017
Edited: Adam Danz
on 14 Jul 2020
You can use Matlab function to construct Gaussian function :
x = 0:0.1:10;
y = gaussmf(x,[2 5]);
plot(x,y)
4 Comments
Chad MacDonald
on 2 Aug 2023
The gaussmf function evaluates a Gaussian membership function for a fuzzy logic system, which is not the same thing as a Gaussian distribution. For more information on Gaussian probability distributions, see Normal Distribution (Statistics and Machine Learning Toolbox).
More Answers (1)
Adam Danz
on 14 Jul 2020
Edited: Adam Danz
on 14 Jun 2022
Fully parameterized gaussian function (no toolboxes needed)
If you don't have the Fuzzy Logic toolbox (and therefore do not have access to gaussmf), here's a simple anonymous function to create a paramaterized gaussian curve.
gaus = @(x,mu,sig,amp,vo)amp*exp(-(((x-mu).^2)/(2*sig.^2)))+vo;
- x is an array of x-values.
- mu is the mean
- sig is the standard deviation
- amp is the (positive or negative)
- vo is the vertical offset from baseline (positive or negative)
To add noise along the y-axis of the guassian,
y = gaus(___);
yh = y + randn(size(y))*amp*.10; % noise is 10% of the amp
Demo
x = linspace(-5,25,100);
mu = 10;
sig = 5;
amp = 9;
vo = -5;
y = gaus(x,mu,sig,amp,vo);
% Plot gaussian
plot(x, y, 'b-', 'LineWidth',3)
% Add noise
yh = y + randn(size(y))*amp*.10;
hold on
plot(x, yh, 'ro','markersize', 4)
grid on
title(sprintf('Guassian with \\mu=%.1f \\sigma=%.1f amp=%.1f vo=%.1f', ...
mu, sig, amp, vo))
Comparison with gaussmf()
x = linspace(-15,10,100);
mu = -5.8;
sig = 2.5;
amp = 1;
vo = 0;
y = gaus(x,mu,sig,amp,vo);
% Plot gaussian from custom function
plot(x, y, 'b-', 'LineWidth',3, 'DisplayName','Custom function')
% Plot gaussian from custom function
y2 = gaussmf(x,[sig,mu]);
hold on
plot(x, y2, 'r--', 'LineWidth',4, 'DisplayName','gaussmf()')
grid on
title(sprintf('Guassian with \\mu=%.1f \\sigma=%.1f amp=%.1f vo=%.1f', ...
mu, sig, amp, vo))
legend()
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