INVERSE OF A FUNCTION
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george veropoulos
el 16 de Dic. de 2020
Comentada: george veropoulos
el 21 de Dic. de 2020
HI i m looking for a script to inverse numericall a function
i use the function of inverse but not working because the functio is a liitle complicate
y=a*sin(x-ψ)+b*exp(-x/c) a,b,c are constand
thank you
2 comentarios
Alan Stevens
el 17 de Dic. de 2020
The right-hand side of your expression will result in an infinite number of values of y, so there won't in general be a unique inverse value. However, if you know the range of values of x that you are interested in then you might be able to get a corresponding value for y using, say, the function fzero.
doc fzero
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Alan Stevens
el 18 de Dic. de 2020
For a gven target value of y you could write a script along the lines of
x0 = initial guess;
x = fzero(@fn, x0);
function z = fn(x)
a = ...
b = ...
etc.
z = a*sin(x-psi)+b*exp(-x/c) - ytarget;
end
fzero will return the value of x that makes z equal zero (to within the appropriate tolerance).
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