Off-topic posts - page 150
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According to your profile, you are registered as a "seller" and you currently have no products visibly published.
You should be able to publish or hide products as you see fit, but if the administration barred you from such activities, then you you should discuss it with the Service Desk.
Hello guys,i got scammed from a seller here named <the name was deleted by moderator>,talked in private and he scammed me for a ea with 400$,is any way to report him here on mql5 and to close his account
You can write to the service desk (look at post #63 ) with your technical proofs and that the seller broke this rules for example.
As my transactions completed please let me know if mine transaction he has completed okay
You know about it only so please - do not post on the forum about something which no one knows except you.
The son of a friend of mine came up with this problem. It's about the exponential function.
Suppose someone takes a medication once a day that has a half-life of 10 hours, which means that after 10 hours the active ingredient concentration is only 50%. But that also means that the concentration is 50% after 10 hours, 25% after 20 hours and around 20% after 24 hours.
If "100%" are taken again, the next 24 hours will 'start' at 120% with an ever-increasing trend - I think.
OK, good!
The negative growth curve of the concentration y is y=e^(c*t) and the derivative is simply y'= c*e(c*t) with a negative constant c.
Now of course we want to know how high the concentration is after 2, 3, 4,... days.
I simply created an Excel table with the columns A:Hour 0-23, B:function y=e^(ct) and twice (C & D) the derivative y'=ce(ct).
I use the derivative to calculate the approximate value of the next hour from the value of the previous hour:
C8 = C7 + $C$4*EXP($C$4*$A7)
I placed the constants c relevant to the course of the exponential function above each column and then I had the target value search look for the value that results in a value of 50% at Hour=10. This resulted in -0.0693147307563196. I also determined the optimal c for the derivative (-0.0661310890282841), since this is only an approximation and the values differ only slightly.
So far so good, but if you start with 120% instead of 100%, everything is wrong? Instead of 60% after 10 hours, it's 70%
What's the mistake?
The table is attached for you to play with.
Hover your mouse over the bottom-right section of your post, until the links appear, and then click "edit".
Hover your mouse over the bottom-right section of your post, until the links appear, and then click "edit".