Mathematical functions power

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  • 03/31/2017 at 3:06 PM #30535 quote
    Broc
    Participant
    Average

    Is there a Prorealtime POWER math function e.g.

    y = x^3  as in 4^3 = 64?

    03/31/2017 at 3:23 PM #30539 quote
    Nicolas
    Keymaster
    Master

    Unfortunately no, this is a already a query for new instruction in the users wish list: https://www.prorealcode.com/topic/centralization-of-queries-and-suggestions-on-prorealtime/

    The best you could do to get the result of this math function is by making a loop like this:

    number=4
pow=3

result=0
i=1
while i<pow do
 if i=1 then 
  result=number
 endif 
 result=result*number
 i=i+1
wend

return result

    Let me know if it’s clear for you.

    03/31/2017 at 3:43 PM #30547 quote
    Broc
    Participant
    Average

    Hi Nicolas

    Thanks for the prompt reply!

    I have found a mathematical equivalent if the Prorealtime LOG function (called Napierian log in the manual) is actually the common LN function:

    y = x^p = e^(p*LN(x))

    This could then be coded as:

    y = EXP(p*LOG(x))

    This works fine.

    W

    Nicolas, zilliq, Maz and 3 others thanked this post
    04/02/2017 at 10:32 AM #30680 quote
    zilliq
    Participant
    Master

    Thanks for your answer wessel 😉

    How did you know that ?

    laurenzo thanked this post
    04/03/2017 at 7:30 AM #30778 quote
    Broc
    Participant
    Average

    I had to do a bit of math research…  Prorealtime could use this formula to create an easy power math function.

     

    B-)

    zilliq and Wing thanked this post
    05/03/2017 at 1:34 PM #34416 quote
    Maz
    Participant
    Veteran

    facepalm

    05/03/2017 at 2:14 PM #34426 quote
    Maz
    Participant
    Veteran

    I have a power function like this?

    // n = 2
// x = 3
// r = n^x

once j = x-1

r = n
if x > 0 then
for  i = 1 to j do
r = (r * n)
next
else
for  i = 1 to j do
r = (r / n)
next
endif

return r
    Nicolas thanked this post
    05/03/2017 at 2:15 PM #34428 quote
    Maz
    Participant
    Veteran

    Here’s tanh (subsequently sinh and cosh)

     

    // x = 2
// result = tanh(x)

once e  = exp(1)
mx = x * -1
eX  = CALL fnPower[e, x]
eXm = CALL fnPower[e, mx]

sinh = 0.5* (eX - eXm)
cosh = 0.5* (ex + eXm)
tanh = sinh / cosh

return tanh

     

    See above for powers

    Nicolas and Wing thanked this post
    05/03/2017 at 2:52 PM #34439 quote
    Nicolas
    Keymaster
    Master

    Great job Maz!

    Maz thanked this post
    05/03/2017 at 9:51 PM #34483 quote
    Maz
    Participant
    Veteran

    You’re welomce; unfortunately it’s very slow but that’s all we have for now 🙂

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Mathematical functions power


ProBuilder: Indicators & Custom Tools

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Broc @wessel Participant
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This topic contains 9 replies,
has 4 voices, and was last updated by Maz
8 years, 9 months ago.

Topic Details
Forum: ProBuilder: Indicators & Custom Tools
Language: English
Started: 03/31/2017
Status: Active
Attachments: 1 files
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