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Little math problem for indicator

  • #1
  • First Post: Dec 12, 2006 3:26am Dec 12, 2006 3:26am
How can we find any point between A and C? In mql4 if possible...

Thanks.
Attached Image
Sorry for my bad english translation
  • #2
  • Dec 12, 2006 3:47am Dec 12, 2006 3:47am
I presume you mean that you need to know IF a point is on the CA line?
If yes then one idea is to compute the angle in C, using the tangent formula and the initial CB and BA distances. Then any point is on CA line if it is on the same angle as the calculated one.
Sorry I'm at work and don't have time to look for mql code...
-soso
  • #3
  • Dec 12, 2006 4:01am Dec 12, 2006 4:01am
find the equation of the line AC.

If A = (x1,y1)
C = (x2,y2)

Eqn of line in terms of x and y will be
(y-y1)(x1-x2) = (x-x1)(y1-y2)

now you'll get an equation similar to 1.8x = 3.9y + 4.5 (this eqn is just an example)
Obviously the constants would be different as your co-ordinates for A and C are different.

Now if your point D with co-ordinates (x3,y3) is to lie on the line, then it must satisfy the equation of line AC.
  • #4
  • Dec 12, 2006 4:28am Dec 12, 2006 4:28am
Thanks for the quick response

This is why i'm asking this question...

If i take a macd line for exemple, and choose 2 point...
i want to know if point(x), between A and B, is above or below the line...
Attached Image
Sorry for my bad english translation
  • #5
  • Dec 12, 2006 10:43am Dec 12, 2006 10:43am
  •  tesla
  • | Joined Oct 2006 | Status: Friendly Neighborhood Programmer | 533 Posts
Here's a regression slope indicator I coded that you might use for reference.

Basically you'll need to calculate the slope and y intercept and that will get you where you need to be.
Attached File(s)
File Type: mq4 Regression Slope.mq4   3 KB | 547 downloads
  • #6
  • Dec 12, 2006 11:30am Dec 12, 2006 11:30am
Thanks for your response
But not exactly(For what i understand)....

I want to know if any point on the MACD line between A and B is over or below the straight line.
I want to look each point on MACD line and know if its over or below a line base on 2 point. On the image they are all below.

I'm doing a little divergence indicator, but i dont want the divergence line to cross any MACD line ( Just want the divergence line to site on top off it ).


Quoting tesla
Here's a regression slope indicator I coded that you might use for reference.

Basically you'll need to calculate the slope and y intercept and that will get you where you need to be.
Sorry for my bad english translation
  • #7
  • Dec 12, 2006 12:58pm Dec 12, 2006 12:58pm
  •  tesla
  • | Joined Oct 2006 | Status: Friendly Neighborhood Programmer | 533 Posts
Yup. That's exactly what I was referring to.

First, calculate the slope between the known points. Blueshift gave you some info, or you can check this page.

Once you have the slope, you use the y-intercept to calculate where the 'B' point should be on the line. It's an easy compare after that.
  • #8
  • Dec 12, 2006 1:11pm Dec 12, 2006 1:11pm
Thank you....
But can wee just say:
If Slope(Line A-B) < Slope (Line AX) then Point X is is OVER line AB

Quoting tesla
Yup. That's exactly what I was referring to.

First, calculate the slope between the known points. Blueshift gave you some info, or you can check this page.

Once you have the slope, you use the y-intercept to calculate where the 'B' point should be on the line. It's an easy compare after that.
Sorry for my bad english translation
  • #9
  • Dec 12, 2006 1:17pm Dec 12, 2006 1:17pm
  •  tesla
  • | Joined Oct 2006 | Status: Friendly Neighborhood Programmer | 533 Posts
Yup, that should do it.
  • #10
  • Last Post: Dec 12, 2006 1:46pm Dec 12, 2006 1:46pm
Thanks for the help!
In fact i did have the answer ( I had the Tangente made )
I was getting confused with searching the point on the line...
So having only the Slope(tangente) is easier and faster.

Big thanks tesla
Ps.:I did a little demo and it work great...
Sorry for my bad english translation
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