Why do I get a wrong value?

Hi.. here's my code

x=[0.1, 0.5, 1]
x_e=[0.1, 0.5, 1]
g=x.^2+2*x_e
g(2)
x(find(g(2)))

I want to find which x value corresponds to g function's 2nd value, but it gives me wrong answer: x=0.1, but the right one is x=0.5. How can I fix it?

[Paresh yeole]

find(g(2))

will return 1 as g(2) is greater than zero.

if you have to find corresponding x value then use

find(x == g(2))

But in your case it will return empty vector as there is no value in x which is equal to 2nd value in g.

Read more about find :

https://www.mathworks.com/help/matlab/ref/find.html

Answer 1

[madhan ravi]

X = interp1(g,x,g(2))
%or
X = x(abs( g - g(2) ) < 1e-2)

[Ani Asoyan]

thank you !