??? Undefined function or method 'gauss' for input arguments of type 'double'.
7 views (last 30 days)
Show older comments
gauss=gauss(x,mu,s) ??? Undefined function or method 'gauss' for input arguments of type 'double'. how to fix this problem? o wanna plot distribution of variable "x"
Answers (4)
Wayne King
on 23 Jul 2014
Edited: Wayne King
on 23 Jul 2014
gauss() is not a MathWorks' function. Have you downloaded this function from somewhere?
If so, you need to add the folder where you have placed the function on the MATLAB path.
Use addpath() or
>>pathtool
to do that.
If you have the Statistics Toolbox, you can simply use normpdf() if you want to obtain a Gaussian PDF.
x = 1:.01:7;
mu = 4.5636;
sd = 0.5969;
y = normpdf(x,mu,sd);
plot(x,y)
Or tell us what you think gauss() is going to do?
0 Comments
Wayne King
on 23 Jul 2014
Edited: Wayne King
on 23 Jul 2014
I'll leave aside whether it is prudent to fit a normal distribution to these data.
Do you have the Statistics Toolbox installed?
If you enter
>>ver
Do you see the Statistics Toolbox listed?
If so, you can do this with your data
x = [5*ones(170,1); 4*ones(90,1); 3*ones(15,1)];
[muhat,sigmahat] = normfit(x);
You'll see those are equal to what you wrote in your post.
The above gives you the estimate mean (muhat) for the fitted normal and the estimated standard deviation.
You can obtain the PDF with:
t = 2:.01:7;
y = normpdf(t,muhat,sigmahat);
plot(t,y)
Alternatively, you can just use histfit()
histfit(x,20,'normal')
0 Comments
Nikola
on 23 Jul 2014
1 Comment
Wayne King
on 23 Jul 2014
histfit() is just scaling the PDF for plotting otherwise you would not see with your data. Look at the output of
[muhat,sigmahat] = normfit(x);
It gives you exactly the mean and standard deviation you included with your original post.
See Also
Categories
Find more on Particle & Nuclear Physics in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!