Wrong equastion of XY dependence

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Pavol Namer
Pavol Namer am 7 Aug. 2014
Kommentiert: Pavol Namer am 7 Aug. 2014
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))
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

Akzeptierte Antwort

Mischa Kim
Mischa Kim am 7 Aug. 2014
Bearbeitet: Mischa Kim am 7 Aug. 2014
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));
The only difference is in the first line. In your code you evaluate y only twice, at x = -5 and at x = 15.
  1 Kommentar
Pavol Namer
Pavol Namer am 7 Aug. 2014
Oh my got :) Thanks a lot, I am totaly stupid guy :))

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David Sanchez
David Sanchez am 7 Aug. 2014
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));
plot (x,y)

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