153 reputation
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bio website alkhoo.carbonmade.com
location
age
visits member for 3 years, 1 month
seen Oct 20 at 8:11

Consultant, with over 20 yrs in the IT industry. Enjoys coding with open source and slapping up algorithm for numerical analysis.

First to integrate Facebook, Dropbox and Google App Engine (see: apps.facebook.com/fileglu).


Oct
20
revised area estimation with tiling
Linked to StackOverflow coding
Oct
18
awarded  Commentator
Oct
18
comment area estimation with tiling
Thanks @chouaib, using your idea I will face the same issue: "(mini) tiles intersected by the line needs to be categorized". Counting pixels is not exact mathematics since some pixels may be in shade of grey (anti-aliased).
Oct
17
revised area estimation with tiling
Fixed error: 1st image had 55 tiled units, not 54
Oct
17
revised area estimation with tiling
Updated picture.
Oct
17
comment area estimation with tiling
Sorry, it is my (human) error. Big picture: I'm trying to figure out a javascript code which can estimate the area by marking out the tiles using either <canvas> or <svg>. ie: kid draws a closed shape with mouse, the code estimate the area.
Oct
17
comment area estimation with tiling
Any bisected tiles, if half or more is inside the shape, we mark the tile. Some unmarked tiles right of apex may be 50% inside. Same with circles, there are 4 tiles which may be inside the circle, again too close to tell.
Oct
17
asked area estimation with tiling
Sep
24
awarded  Autobiographer
Jun
15
comment Measuring diaognals without Sine Law
Accepted as technically correct answer (just that it is too complex for young kids).
Jun
15
awarded  Scholar
Jun
15
accepted Measuring diaognals without Sine Law
Jun
14
revised Measuring diaognals without Sine Law
Found a different solution, without quadratric formula
Jun
14
comment Measuring diaognals without Sine Law
math.stackexchange.com/questions/834327/… is a similar construct. Notice top figure has simple solution but lower figure involves quadratic formula. @jean: Am trying to find a simple solution which doesn't involve Trig functions. Meaning any kids can take a normal calculator and have some fun with triangulations.
Jun
14
asked Measuring Diagonals (part 2)
Jun
14
comment Measuring diaognals without Sine Law
Big picture: Triangulation for a kid. We cant see O(x,y) from origin (0,0), but we can walk along the X and Y axis until we see O, then measure (estimate) distance. From there, calculate 'q' (wondering if I skip sine law would simplify calculations).
Jun
14
comment Measuring diaognals without Sine Law
Updated pic, the angle between 'a' and 'f' is not right angle, sorry for confusion.
Jun
14
revised Measuring diaognals without Sine Law
Updated to better pic
Jun
14
awarded  Student
Jun
14
asked Measuring diaognals without Sine Law