Test of Approximately Equality
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Hello,
I have a value b and c. b and c are approximatly equal (b~c). They have +-5% difference.
I want to test of approximately equality..like this:
if b~c (with +-5% difference)
return something...
end
0 comentarios
Respuestas (3)
Jan
el 17 de Jun. de 2012
You only have to decide if it should be 5% of the first or the second argument. Then:
if abs(b - c) < 0.05 * b
or
if abs(b - c) < 0.05 * max(b, c)
or
if abs(b - c) < 0.05 * min(b, c)
or
if abs(b - c) < 0.05 * (b + c) * 0.5
2 comentarios
Walter Roberson
el 17 de Jun. de 2012
Some of those expressions will have difficulty if "b" is negative.
Greg Heath
el 18 de Jun. de 2012
1. Try using "abs" on the RHS
2. Might also consider median(abs(b),abs(c))
Greg
Stephen Nagy
el 29 de Dic. de 2017
Your desired goal isn't entirely clear, but depending on the outcome you seek, the functions "uniquetol" and some of its related functions might be helpful.
1 comentario
Walter Roberson
el 29 de Dic. de 2017
ismembertol() and uniquetol() did not exist in 2012 though ;-)
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