fit data to distribution issue

2020 7 28
1 个回答
更新时间：2020 8 6
13 次查看（30 天）

0 个投票

Dear All;
I am trying to fit data to a normal distribution and plot pdf but pdf plot shows several lines , i do not know why it is coming , could you help.
figure is attached

5 个评论
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Turlough Hughes
Turlough Hughes 2020-7-28
What code did you use?
Mustafa Al-Nasser
Mustafa Al-Nasser 2020-7-28
Thank you Hughes for your cooperation
this is the code i use
input1=input(1:1704,:)
input1= smoothdata(input1,'gaussian',5);
input2=input(1705:3533,:)
input2= smoothdata(input2,'gaussian',5);
input3=input(3534:5250,:)
input3= smoothdata(input2,'gaussian',5);
figure(3);
plot(input1);
title('smoothData');
figure(4);
plot(input2);
title('smoothData');
figure(5);
plot(input3);
title('smoothData');
pd1 = fitdist(input1,'Normal')
pd2 = fitdist(input2,'Normal')
pd3 = fitdist(input3,'Normal')
y1 = pdf(pd1,input1);
y2 = pdf(pd2,input2);
y3 = pdf(pd3,input3);
plot(input1,y1,'LineWidth',2)
hold on
plot(input2,y2,'LineWidth',2)
plot(input3,y3,'LineWidth',2)
Turlough Hughes
Turlough Hughes 2020-7-28
Can you provide the data also so we can replicate what you have done, ie the variable input
Mustafa Al-Nasser
Mustafa Al-Nasser 2020-7-28
I extracted the related data part
Many thanks

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回答（1 个）

Raunak Gupta
Raunak Gupta 2020-8-6

0 个投票

Hi,
From the code and data provided on question and comment, I see that the output you are plotting is not in sorted order. So basically, what you are currently seeing is the connected line between all the data points which is going in the direction of how the points are arranged in the input vector. For seeing a continuous line either you can sort both the input1 and y1 before plotting (And similarly for other two pairs) or instead of line you can plot circles for every datapoint. This will give correct visualization. Both approaches can be done like below:
% Sorting the input1 and y1 simultaneously
[input1sorted, ind] = sort(input1);
y1sorted = y1(ind);
plot(input1sorted, y1sorted,'LineWidth',2);
% plotting only dot for each datapoints
plot(input1,y1,'o');

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