CODEWITHSUNDEEP
phpmathfloating-point-precision
Bayu Angga Satrio
Bayu Angga Satrio

Reputation: 131

I get problems regarding mathematical operations using an array php

I do mathematical calculations using two arrays like this

$d_positif

array(3) { [0]=> float(2.7742631687417) [1]=> float(2.5949809043991) [2]=> float(3.0174025996932) }

$d_negatif

array(3) { [0]=> float(2.7259998526469) [1]=> float(3.4826656582587) [2]=> float(3.2284968891602) }

and i have formula

$count = count($d_positif);

    for ($i = 0; $i < $count; $i++) {
        $v[$i] = $d_positif[$i] / ($d_negatif[$i] + $d_positif[$i]);
    }

V1 = 2.7742631687417 / (2.7742631687417 + 2.7259998526469)

V2 = 2.5949809043991 / (2.5949809043991 + 3.4826656582587)

V3 = 3.0174025996932 / (3.0174025996932 + 3.2284968891602)

I should get a result like this

array(3) { [0]=> float(0,495612636) [1]=> float(0,573028659) [2]=> float(0,51689863) }

but the output of mathematical operations like this

array(3) { [0]=> float(0.50438736437759) [1]=> float(0.42697134123315) [2]=> float(0.48310136995931) }

anyone can help me why it can be like that?

Upvotes: 2

Views: 57

Answers (1)

Don&#39;t Panic
Don&#39;t Panic

Reputation: 41810

The output you are expecting is actually the result of

$v[$i] = $d_negatif[$i] / ($d_negatif[$i] + $d_positif[$i]);

not

$v[$i] = $d_positif[$i] / ($d_negatif[$i] + $d_positif[$i]);

Upvotes: 3

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