How to I find a x value from a given y?

I have plotted a Matlab graph using a long matrix. I am looking to find the code which gives me an x value from the line graph given a y.

Answer 1

[Thorsten]

 x(y==yourvalue)

or if you allow for some tolerance

tol = 1e-6;
x(abs(y-yourvalue) < tol)

[Matilde Garcia]

Thank you. I believe it worked.

[antlhem]

Hi, how can I do this with a fit result curve?

fitresult = 
     General model Exp2:
     fitresult(x) = a*exp(b*x) + c*exp(d*x)
     Coefficients (with 95% confidence bounds):
       a =    1.8e+06  (9.921e+05, 1.169e+06)
       b =     -0.568  (-0.5406, -0.373)
       c =   2.19e+06  (2.846e+06, 2.992e+06)
       d =    -0.217  (-0.01379, -0.01056)

x(fitresult==10000) is not working. How can this work?

[Coryn Melissa LLamoza Carabali]

Hi, have the same problem you have. Were you able to get it to work?

[Suhel Tamboli]

Hello, how can I get y values for a range of x values (from a particular x value to another)?

Answer 2

[Salih CIL]

Thx it is working :)