Why do I keep running into errors???

Question

Ehi Eromosele 2014-2-11

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/115774-why-do-i-keep-running-into-errors

评论： Walter Roberson 2014-2-12

function points=refine(x1, x2, tol)
  xm = (x1+x2)./2;
if abs((f(x1)+f(x2))./2-f(xm))<tol
  points=[x1,x2];
else
  left=refine(x1, xm, tol);
  right=refine(xm, x2, tol);
  points=[left, right(2:length(right))];
end
end
function linearinterp
  x=linspace(-5, 2*pi, 30);
  y=exp.^(-x./2).*sin(x^.2+8);
  points=refine(0, 7, 0.1);
  plot(x, y, points, f(points), 'r+');
  hold on
  plot(points, f(points));
  hold off
end

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Azzi Abdelmalek 2014-2-11

How are we supposed to know? no error message, no details about how you ran your two functions ...

Ehi Eromosele 2014-2-12

Sorry. I put in the tags section.

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Answer 1

Walter Roberson 2014-2-12

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https://ww2.mathworks.cn/matlabcentral/answers/115774-why-do-i-keep-running-into-errors#answer_124039

在 MATLAB Online 中打开

You cannot just press F5 or click on "run". You need to go to the command window and call the function like you were putting it into a program. For example,

refine(1.343, 83.60, 1e-6)

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Ehi Eromosele 2014-2-12

Yea I put refine(0, 7, 0.1). but there is still arguements.

Walter Roberson 2014-2-12

Where did you define "f" ?

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Answer 2

Image Analyst 2014-2-12

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https://ww2.mathworks.cn/matlabcentral/answers/115774-why-do-i-keep-running-into-errors#answer_124047

exp.^(-x./2) is not proper. exp is a function, not the value "e", so it must be immediately followed by a left parenthesis: exp(-x/2). You do not need the dot before the slash because 2 is a scalar, not an array.