How to set up an approximately equal conditional statement?

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Nicholas Henderson
Nicholas Henderson 2016-9-26
移动：Stephen23 2025-7-11
with a tolerance of a certain value like .05, how would I check if the values for example x = 1 and y = 1.02 were approximately equal?

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回答（4 个）

Star Strider
Star Strider 2016-9-26
I would do something like this:
x = 1;
y = 1.02;
tol = 0.05;
app_eq = @(x,y,tol) abs(x-y)<tol;
Out = app_eq(x,y,tol)
Out =
1
The result ‘Out’ is a logical value of 1 or true.
John D'Errico
John D'Errico 2016-9-26
What would this tell you?
abs(x - y)
Walter Roberson
Walter Roberson 2016-9-26
You may wish to look at ismembertol()
Jennifer Rebbin
Jennifer Rebbin 2025-7-10
移动：Stephen23 2025-7-11
Ran in:
Starting in R2024b, you can use the isapprox function to determine if two input arrays are approximately equal. Specify the maximum allowed difference between elements using the AbsoluteTolerance name-value argument.
isapprox(1,1.02,AbsoluteTolerance=0.05)
ans = logical
1
isapprox(1,1.02,AbsoluteTolerance=0.01)
ans = logical
0

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