Question about constraints in optimization problems

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Rahim Rahim
Rahim Rahim 2020-11-29
评论： Walter Roberson 2020-11-29
I have the following victor:
A=[ 0.1 0.1 0.3 0.2 0.3]
The sum of this vector is 1, but when I try the following code:
Test = (sum(A(:)) ==1)
If ( Test == 1 )
"True"
Else
"False"
The results is always FALSE.
What is the problem

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回答（1 个）

Ameer Hamza
Ameer Hamza 2020-11-29
编辑：Ameer Hamza 2020-11-29
This is due to the finite precision of floating-point numbers. Calculations on floating points numbers can accumulate errors, so the value is not exactly equal to one. You need to allow a bit of tolerance in comparing floating-point values. For example
Test = (sum(A(:)) ==1)
if ( abs(Test-1) < 1e-6 )
"True"
else
"False"
end
Read more about this here: https://en.wikipedia.org/wiki/Double-precision_floating-point_format
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Rahim Rahim
Rahim Rahim 2020-11-29
编辑：Rahim Rahim 2020-11-29
@Walter Roberson thank you for your comment
Any part should I see ?

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