Wrong equastion of XY dependence

Question

Pavol Namer 2014-8-7

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/146672-wrong-equastion-of-xy-dependence

评论： Pavol Namer 2014-8-7

采纳的回答： Mischa Kim

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Hi I try to solve following problem.

I try to type following equastion of XY dependence:

x= [-5,15]
a= 1
b= 12
c= 2.4
r= 1
y= -1*(a-b*(((x)-r)).^4).*(exp(-1*c*((x)-r).^2))
figure
plot (x,y)

it should be this equation:

And it should have this shape of XY dependence

But it give me the wrong shape (like linear XY dependence).

Can anybody advise, where the mistake i?

Thank you

P.

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Answer 1

Mischa Kim 2014-8-7

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编辑：Mischa Kim 2014-8-7

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Use,

 x = -5:0.1:15;  % create a vector x, element spacing: 0.1
 a = 1;
 b = 12;
 c = 2.4;
 r = 1;
 y = -1*(a-b*(((x)-r)).^4).*(exp(-1*c*((x)-r).^2));
 figure
 plot(x,y)

The only difference is in the first line. In your code you evaluate y only twice, at x = -5 and at x = 15.

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Pavol Namer 2014-8-7

Oh my got :) Thanks a lot, I am totaly stupid guy :))

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Answer 2

David Sanchez 2014-8-7

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Instead of your definition of x, try the folowing one:

x= -5:.01:15; % array of 2001 elements, your definition were a mere 2 element array
a= 1;
b= 12;
c= 2.4;
r= 1;
y= -1*(a-b*(((x)-r)).^4).*(exp(-1*c*((x)-r).^2));
figure
plot (x,y)