Module:Convert and Module:Convert/sandbox: Difference between pages

Line 415:

-- a = (altitude / 5000) rounded to nearest integer (-3 to 80)

-- s = speed of sound (mph) at that altitude

-- LATER: Should calculate result from an interpolation between the next

-- lower and higher altitudes in table, rather than rounding to nearest.

-- From: http://www.aerospaceweb.org/question/atmosphere/q0112.shtml

local mach_table = { -- a =

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672.5, 674.3, 676.1, 677.9, 679.7, 681.5, 683.3, 685.1, 686.8, 688.6, -- 71 to 80

}

local ~~function lerp~~(~~t, v0, v1~~)

altitude = altitude or 0

~~return t * v1 + (1~~ - ~~t) * v0~~

local a = (altitude < 0) and -altitude or altitude

a = floor(a / 5000 + 0.5)

if altitude < 0 then

a = -a

end

~~altitude = (altitude or 0) / 5000~~

if a < -3 then

if ~~altitude~~ < -3 then

a = -3

~~altitude~~ = -3

elseif a > 80 then

elseif ~~altitude~~ > 80 then

a = 80

~~altitude~~ = 80

end

~~local mach_mph~~

return mach_table[a + 4] * 0.44704 -- mph converted to m/s

~~local a = math.floor(altitude)~~

~~if a == altitude then~~

~~mach_mph = mach_table[a + 4]~~

~~else~~

~~mach_mph = lerp(altitude - a,~~ mach_table[a + 4]~~, mach_table[a + 5])~~

~~end~~

~~return mach_mph~~ * 0.44704 -- mph converted to m/s

end

-- END: Code required only for built-in units.

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if not success then return false, result end

override_from(result, t, { 'customary', 'default', 'link', 'symbol', 'symlink', 'usename' })

~~if t.default then~~

~~result.defkey = unitcode -- so default_exceptions uses the alias code, not the target symbol~~

~~end~~

local multiplier = t.multiplier

if multiplier then