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use the result of the fit function as a legend in a plot

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ignacio bobadilla tapia
ignacio bobadilla tapia 2021 年 7 月 29 日
コメント済み: KSSV 2021 年 7 月 29 日
Hello everyone, I wanted to ask how I can make the legend of the graph be the result of the linear regression that is done with the command 'fit', and that polynomial represent it in the legend, for example y = ax + b, there will be some way to do it automatically or is it done manually?. Thanks.
reg=load('regression.txt')
ft=fit(reg(:,1),reg(:,2),'poly1')
plot(ft,'-r',reg(:,1),reg(:,2),'ob')

回答 (1 件)

KSSV
KSSV 2021 年 7 月 29 日
編集済み: KSSV 2021 年 7 月 29 日
load census;
f=fit(cdate,pop,'poly2') ;
h = plot(f,cdate,pop) ;
legendinfo = legend(h) ;
f
f =
Linear model Poly2: f(x) = p1*x^2 + p2*x + p3 Coefficients (with 95% confidence bounds): p1 = 0.006541 (0.006124, 0.006958) p2 = -23.51 (-25.09, -21.93) p3 = 2.113e+04 (1.964e+04, 2.262e+04)
legendinfo.String{2} = formula(f) ;
  2 件のコメント
KSSV
KSSV 2021 年 7 月 29 日
load census;
f=fit(cdate,pop,'poly2') ;
eq = formula(f); %Formula of fitted equation
parameters = coeffnames(f); %All the parameter names
values = coeffvalues(f); %All the parameter values
for idx = 1:numel(parameters)
param = parameters{idx};
l = length(param);
loc = regexp(eq, param); %Location of the parameter within the string
while ~isempty(loc)
%Substitute parameter value
eq = [eq(1:loc-1) num2str(values(idx)) eq(loc+l:end)];
loc = regexp(eq, param);
end
end
h = plot(f,cdate,pop) ;
legendinfo = legend(h) ;
legendinfo.String{2} = eq;

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