Comparison Using a Tolerance

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Yong Teng 2023-11-14

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2046897-comparison-using-a-tolerance

评论： Voss 2024-1-1

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,

∣x−y∣<ϵ

for some small tolerance

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,...)

TASK

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.

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Hemapriya 2024-1-1

@Vipuj same error is coming . . . can you please help me to solve. . . if you solveduhave

Voss 2024-1-1

@Hemapriya: See if this answer works for you:

https://www.mathworks.com/matlabcentral/answers/2046897-comparison-using-a-tolerance#answer_1370009

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回答（2 个）

Anton Kogios 2023-11-14

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2046897-comparison-using-a-tolerance#answer_1352002

在 MATLAB Online 中打开

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

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Cris LaPierre 2023-12-12

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2046897-comparison-using-a-tolerance#answer_1370009

编辑：Cris LaPierre 2023-12-12

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).