To store plotregression value in a variabe

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veeresh g 2020-4-3

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https://ww2.mathworks.cn/matlabcentral/answers/515033-to-store-plotregression-value-in-a-variabe

评论： Rodolfo 2021-9-26

采纳的回答： Mehmed Saad

is it possible to store the regression (R) value in a variable

%%plots the linear regression of targets relative to outputs.

plotregression(targets,outputs)

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Answer 1

Mehmed Saad 2020-4-3

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https://ww2.mathworks.cn/matlabcentral/answers/515033-to-store-plotregression-value-in-a-variabe#answer_423735

在 MATLAB Online 中打开

Suppose the example given below

it is matlab example

[x,t] = simplefit_dataset;
net = feedforwardnet(10);
net = train(net,x,t);
y = net(x);
v =figure,
plotregression(t,y,'Regression')

%% To get Data
Data_X = v.Children(3).Children(1).XData;
Data_Y = v.Children(3).Children(1).YData;
%% To get Fit
Fit_X  = v.Children(3).Children(2).XData;
Fit_Y  = v.Children(3).Children(2).YData;
%% To get YeqT

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Mehmed Saad 2020-4-6

编辑：Mehmed Saad 2020-4-6

在 MATLAB Online 中打开

The Long Method

When you use plotregression command, it plots 3 Things

Data
Fit
Y = T

Along with that there are titles, xlabel, ylabel and legends

We have the figure handle (we saved it in a variable named v)

v = figure;
plotregression(t,y,'Regression')

the other way to get handle is

v = plotregression(t,y,'Regression');

plotregression commands gives you figure handle as an output too.

After plotregrssion plots the figure, we access its handle as all the data related to that figure is saved in that handle. Remeber once you close the figure you cannot access the data anymore.

Type the following in command window

v.Children

You will se this, it shows that your figure has 3 children

UIControl
Legend
Axes

We are interested in Axes as regression value is stored in axes title

Type the following in command window

v.Children(3)

you will se that this is the axes handle and you have all the properties of axes like title, xlabel, ylabel etc. Also all the values of Data, Fit an Y=T are stored in axes childrens.

Type following in command window to see Title properties

v.Children(3).Title

you will see that it's a text type and all info is shown. What we want is the string value Which is

'Regression: R=0.2145'

acess this string via

v.Children(3).Title.String

your ans will be

'Regression: R=0.2145'

Store it in some variable as i did in str in the above answer

str = v.Children(3).Title.String;

Now what you want is the value written after equal to sign, so find the equal to sign in str using following command

ind=find(str=='=');

now it will tell you the location of equal to in str

go to next index and you R value starts

R_in_str =str(ind+1:end);

Now this will give you the value of R but in the form of string

'0.2145'

convert it into double

R=str2double(R_in_str)

Your R value is Ready

The Short Method

Remeber that you can access R value directly using regression command. Go to help and type regression, it has the following sytax

[r,m,b] = regression(t,y)

when r is the regresson value you are getting on your plot title

so simply type

[R,~,~] = regression(t,y);

and your R value is in your hand

Mehmed Saad 2020-4-6

cheers

Rodolfo 2021-9-26

Awesome. I was searching for this since July.

Thank you

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