CODEWITHSUNDEEP
phpscientific-computing
MasterT
MasterT

Reputation: 623

scientific calculation in PHP

i have a client that wants to turn this calculation into a function in PHP. i been given test numbers with an answer for it and i am out from this answer by too much for it to be correct im not sure if the calculation is wrong or im just not seeing the issue.

Scientific Calculation

function Density($m1 , $m2, $m3, $pw, $psm){

  return   $m1 /  (($m2 - $m3) / $pw) - (($m2 - $m1) / $psm) ; 
} 
$Density = ( Density(746.2, 761.7, 394.6, (998.1*1000), (761.7-746.2)) / 1000000)

output : 2.02882553228
answer : 2.127

also i have tried it like this as well but this is way far out for it to be right

function Density($m1 , $m2, $m3, $pw, $psm){

  return   $m1 /  ((($m2 - $m3) / $pw) - (($m2 - $m1) / $psm )); 
} 

output : -0.001
answer : 2.127

i know it should be as close to the answer as it can get 0.010 out fromthe correct answer but i dont see what im doing wrong please help internet.

Upvotes: 0

Views: 439

Answers (2)

Igwe Kalu
Igwe Kalu

Reputation: 14868

Your implementation is different from the required.

You should ensure operator precedence rule is correctely observed:

return   $m1 /  ((($m2 - $m3) / $pw) - (($m2 - $m1) / $psm)) ;

Upvotes: 0

Marc B
Marc B

Reputation: 360702

Remember BEDMAS - brackets exponents division multiplication addition subtraction. Your code is wrong for the order-of-operations:

m1 / (((m2 - m3) / pw) - ((m2 - m1) / psm))

or, if that equation had been typeset properly:

          m1
 --------------------
 m2 - m3      m2 - m1
 -------  -   -------
    pw          psm

Upvotes: 3

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