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# Grid Calculator

Calculate the number of fields or spaces, bars and knots of a two- and of a three-dimensional grid. A two-dimensional grid contains fields, a three-dimensional grid contains spaces, each of them surrounded by bars. The number of fields easily calculates as m=a*b, the rooms as m=a*b*c.
Please enter at least a and b, c is optional.

 Fields, spaces in length a: Fields, spaces in height b: Fields, spaces in depth c: Number of fields, spaces m: Number of bars n: Number of knots k:

A bar here is a straight line between two crossings. The calculation of the number of grid bars is more complicated. The formula is:
for 2D: n = (2a+1)*b+a
for 3D: n = [(2a+1)*b+a]*(c+1)+(a+1)*(b+1)*c

A knot is at the crossing of bars. The formula is:
for 2D: k = (a+1)*(b+1)
for 3D: k = (a+1)*(b+1)*(c+1)

Example: a three-dimensional grid with 6 spaces in length, 5 spaces in height and one space in depth has 30 spaces, 184 grid bars and 84 knots.

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