# Comparison Using a Tolerance

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Yong Teng on 14 Nov 2023
Commented: Voss on 1 Jan 2024
Hi, can any one help on this question?
The built-in operations x == y and isequal(x,y) will both test whether two numbers x and y have exactly the same value. However, because computers use finite-precision arithmetic, you may often want to test whether two numbers are close, rather than exactly equal. That is,
xy<ϵ
for some small tolerance
ϵ
.
Recall that a function declaration line starts with the keyword function, followed by the same syntax as you would use to call the function.
[out1,out2,...] = fun_name(in1,in2,...)
Write a function named isequal_tol which takes three scalar inputs, x, y, and a tolerance tol.
It should return a single output with the value true if x and y differ by less than tol and false otherwise.
Hemapriya on 1 Jan 2024
@Vipuj same error is coming . . . can you please help me to solve. . . if you solveduhave
Voss on 1 Jan 2024

Anton Kogios on 14 Nov 2023
Test cases
isequal_tol(1,5,1e-3) % false
ans = logical
0
isequal_tol(1,1,1e-3) % true
ans = logical
1
isequal_tol(pi,3.141593,1e-3) % true
ans = logical
1
isequal_tol function:
function z = isequal_tol(x,y,tol)
if abs(x-y) < tol
z = true;
else
z = false;
end
end

Cris LaPierre on 12 Dec 2023
Edited: Cris LaPierre on 12 Dec 2023
The issue in both cases is that there are 2 "isequal_tol.mlx" files open. Please close them both, then either click Reset or navigate away, and then back to this problem (the whole page, not just the task).
Cris LaPierre on 12 Dec 2023
Benson Moyo on 13 Dec 2023
Thank you very much my question was well answered.