How to get value of X based on a specific value of Y in Graph

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How to get value of X based on a specific value of Y in Graph
for example
x = [ 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 ];
y= [ -77.4236 -91.4051 -105.387 -119.368 -133.35 -147.331 -161.313 -175.294 -189.276 -203.258 ]
and i have to find at what value of x i m getting y value of 100 or any negative value of Y.

Respuesta aceptada

Walter Roberson
Walter Roberson el 27 de Oct. de 2020
x100 = interp1(y, x, 100, 'linear', 'extrap')
  7 comentarios
Walter Roberson
Walter Roberson el 27 de Oct. de 2020
The left hand side should be a variable name that does not have to include the number. For example you could assign to xinterp or to x_at_negative_100

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