Wrong equastion of XY dependence
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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.
采纳的回答
Mischa Kim
2014-8-7
编辑：Mischa Kim
2014-8-7
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.
更多回答（1 个）
David Sanchez
2014-8-7
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)
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