How to do moving average for x and y data points in a scatter plot?

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Vidushi Koliyan 2023-4-23

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评论： Image Analyst 2023-4-23

DATA.mat

I have soil moisture (x) data in the first column and correlation(y) data in the second column. I want a moving average line through the scatter plot of x and y data.I am getting a line which is connecting all the points which seems quite wrong.

Can somebody help me with this?

Thank you so much.

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Dyuman Joshi 2023-4-23

Moving average how many points? What have you tried and what seems to be wrong?

Vidushi Koliyan 2023-4-23

Below is the code I used for 10 points. But it doesn't include x data. I want to see how moving average will look like with x y data.

x = DATA(:,1);

y = DATA(:,2);

plot(x,y,'xr-')

N = 8;

V = ones(1,N)/N;

Z = conv(y,V,'same')

hold on

plot(x,Z,'b-')

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Answer 1

Dyuman Joshi 2023-4-23

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移动：Image Analyst 2023-4-23

在 MATLAB Online 中打开

DATA.mat

It's not clear to me what exactly do you want to achieve.

You say 10 points, but you use N=8.

"I want to see how moving average will look like with x y data. "

Do you mean like this?

load DATA.mat

x = DATA(:,1);

y = DATA(:,2);

scatter(x,y,'xr')

N = 8;

%Moving mean of both x and y data

arr=movmean(DATA,N,1);

hold on

plot(arr(:,1),arr(:,2),'b-')

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Image Analyst 2023-4-23

Garbage in garbage out. I think that even after smoothing the data points are unreliable. What is the time (called "x" by you instead of "t") sampling rate of this soil mosture device? What time period is it over? Milliseconds, seconds, hours, weeks, months? There seems to be little correlation between adjacent time points and I would not expect that for soil moisture unless the time points were very far apart.

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