How does the 'Smooth' function work?

kj16v · Post by **kj16v** » Fri Apr 15, 2011 8:16 am

Hi all. Could someone please explain to me how the 'Smooth' function works in the table editors? It's not explained in the Help file and I can't work it out. I'm sure it's all very simple but unfortunately so am I!

EagleMark · Post by **EagleMark** » Fri Apr 15, 2011 12:22 pm

Subscribed...

Six_Shooter · Post by **Six_Shooter** » Fri Apr 15, 2011 12:27 pm

Select the smooth option and input a value of 1 or less. This will change how much "smoothing" takes place.

This will blend all adjacent cells to be a smooth transition.

EagleMark · Post by **EagleMark** » Fri Apr 15, 2011 12:52 pm

Six_Shooter wrote:Select the smooth option and input a value of 1 or less. This will change how much "smoothing" takes place.

This will blend all adjacent cells to be a smooth transition.

Tried 1... fail... has to be 0 to .99 so the failure box says...

Six_Shooter · Post by **Six_Shooter** » Fri Apr 15, 2011 8:01 pm

My bad, it's been a long time since I've tried it. Thought it was up to 1, but .99 rounded is "1".

lol

Honestly I haven't ran any tunes that I used the smooth function on, since I've always needed more tuning and I figure the smooth function would be a last use item. I just tried it a few times to see what it did.

kj16v · Post by **kj16v** » Sat Apr 16, 2011 12:59 am

Six_Shooter wrote:Select the smooth option and input a value of 1 or less. This will change how much "smoothing" takes place.

This will blend all adjacent cells to be a smooth transition.

That's the way I would have thought it worked but the numbers it comes up with never seem to make sense (well, not to me anyway). I can't work out what maths TP uses to calculate the numbers.

For examplem I typed in:

10 10 10 10 100
10 10 10 10 100

I then hilighted the top row and smoothed by 0.1 and got this:
40.84 46.18 55.86 59.85 90.18
10 10 10 10 100

EagleMark · Post by **EagleMark** » Sat Apr 16, 2011 1:31 am

I played with it a little since this post and can say it is not for doing the entire table or a row but only one cell at a time.

Six_Shooter · Post by **Six_Shooter** » Sat Apr 16, 2011 3:32 am

Uhh, how can you "smooth" one cell?

This is for doing the entire table, or at least a large section, to have the transition between adjacent cells, well, "smooth" when looking at it in the 3D view makes this obvious.

EagleMark · Post by **EagleMark** » Sat Apr 16, 2011 3:48 am

I don't know? that's why I'm here...

If you highlight one cell in Main VE table and set to smooth with a value of .1 it will change that cell to what seems to be middle of each cell on either side.

Now if you highlight say all cells in first row 400 rpm and smooth set to .1 then the entire row is smoothed but cell one (400 rpm 20 MAP) changes from 16. to 34. which is not good.

Post by **Mangus** » Sat Apr 16, 2011 7:03 am

GlennEFI wrote:If you highlight one cell in Main VE table and set to smooth with a value of .1 it will change that cell to what seems to be middle of each cell on either side.

Exactly.

The closer to 1 that you get, the less smoothing will occur. It's a naive 4-pass smoothing algorithm that passes left to right, right to left, top to bottom, and bottom to top. Each pass looks at tthe previous cell relative to the direction it is traveling. Here's the math (where alpha is the number you enter in the box):

currentCell = (previousCell * alpha) + ((1.0 - alpha) * (previousCell))

currentCell becomes previousCell for the next row or column, so this is "chained" in effect to create the smoothed cells. Lower cells are lifted, higher cells are lowered. Over-smoothing results in a flat table.

EagleMark · Post by **EagleMark** » Sat Apr 16, 2011 12:07 pm

Sweet! I don't even Know what you just said? And I got it right! LOL

Any other tips on the smooth?