Error Using Function Fplot

Question

Harel Harel Shattenstein 2018-7-8

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/409294-error-using-function-fplot

回答： Stephan 2018-7-8

T=[-20:20:120]
mu=[4 0.38 0.095 0.032 0.015 0.0078 0.0045 0.0032]
function []=ex4(T,mu)
  A=[ones(length(T),1) T', (T.^2)'];
  sol=A\(log(mu))';
  f=@(x)e^(sol(1)+sol(2)*x+sol(3)*x.^2);
  hold on
  fplot(f,[min(T),max(T)])
  scatter(T,mu)
end

I get and error in fplot, what can it be?

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Answer 1

Stephan 2018-7-8

1
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https://ww2.mathworks.cn/matlabcentral/answers/409294-error-using-function-fplot#answer_327944

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Hi,

this should work - see comment for the issue:

T=[-20:20:120]
mu=[4 0.38 0.095 0.032 0.015 0.0078 0.0045 0.0032]
% Call the function to see the plot
ex4(T,mu)
function []=ex4(T,mu)
  A=[ones(length(T),1) T', (T.^2)'];
  sol=A\(log(mu))';
    % ----------------------------------------
    % --> if you want e^x in matlab use exp(x)
    f=@(x)exp(sol(1)+sol(2).*x+sol(3).*x.^2);  
    % ----------------------------------------
    hold on
    fplot(f,[min(T),max(T)])
    scatter(T,mu)
  end