Module:Math: Difference between revisions
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en>Banaticus (created random module) |
en>Dragons flight (Add precision calculation) |
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local |
local z = {} |
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function |
function z.random( frame ) |
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first = tonumber(frame.args[1]) -- if it doesn't exist it's NaN, if not a number it's nil |
first = tonumber(frame.args[1]) -- if it doesn't exist it's NaN, if not a number it's nil |
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second = tonumber(frame.args[2]) |
second = tonumber(frame.args[2]) |
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Line 13: | Line 13: | ||
return math.random() |
return math.random() |
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end |
end |
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function z.precision( frame ) |
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return z._precision( frame.args[1] or frame.args.x or '0' ) |
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end |
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-- Determines precision of a number using the string representation |
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function z._precision( x ) |
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x = string.upper( x ) |
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local decimal = string.find( x, '.', 1, true ) |
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local exponent = string.find( x, 'E', 1, true ) |
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local result = 0; |
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if exponent ~= nil then |
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exponent = string.sub( x, exponent + 1 ) |
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x = string.sub( x, 0, exponent ) |
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result = result - tonumber( exponent ) |
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end |
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if decimal ~= nil then |
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result = result + string.len( x ) - decimal |
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return result |
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end |
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local pos = string.len( x ); |
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while x:byte(pos) == string.byte('0') do |
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pos = pos - 1 |
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result = result - 1 |
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if pos <= 0 then |
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return 0 |
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end |
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if x:byte(pos) == string.byte('.') then |
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pos = pos - 1 |
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end |
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end |
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return result |
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end |
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return z |