Commit dfa3279

print( "----- Strings" )

print( string.byte( "ABCDE", 1, -2 ) ) -- console output: "65 66 67 68"

print( string.rep( "w", 3 ) .. ".sick.com" ) -- console output: "www.sick.com"

print( string.reverse( "Hello" ) ) -- console output: "olleH"

print( string.sub( "AppSpace", 6, -1 ) ) -- console output: "ace"

print( string.format( "%s %.10f", "Pi is exactly", math.pi ) )

-- console output: "Pi is exactly 3.1415926536"

print( "----- Concatenate tables and access elements" )

local myTable = { "one", "two", "three", "four" }

print( table.concat( myTable ) ) -- console output: "onetwothreefour"

print( table.concat( myTable, ":" ) ) -- console output: "one:two:three:four"

print( table.concat( myTable, "-", 2, 4 ) ) -- console output: "two-three-four"

print( table.maxn( myTable ) .. " == " .. #myTable ) -- console output: "4.0 == 4"

myTable[ #myTable + 1 ] = "five"

table.insert( myTable, #myTable + 1, "six" )

-- console output: "Runtime error: bad argument #2 to 'insert' (position out of bounds)"

table.insert( myTable, #myTable + 1, nil )

myTable[ #myTable + 1 ] = nil

table.insert( myTable, #myTable + 1, "nine" )

print( #myTable .. "; " .. myTable[ #myTable ] ) -- console output: "7; nine"

table.sort( myTable, function ( a, b ) return a < b end )

print( table.concat( myTable, "," ) )

-- console output "five,four,nine,one,six,three,two"

print( "----- Use tables as dictionaries or maps and access elements" )

local myMap = { key1 = "value1", key2 = false }

print( myMap.key1 ) -- console output: "value1"

myMap.newKey = { "one", "two", "three" }

myMap.key2 = nil

print( myMap.key1 ) -- console output: "value1"

print( myMap.key2 ) -- console output: "nil"

print( myMap[ "newKey" ][ 2 ] ) -- console output: "two"

print( #myMap ) -- console output: "0"

print( #myMap.newKey ) -- console output: "3"

print( myMap.newKey[ 10 ] ) -- console output: "nil"

print( "----- Library math" )

print( math.sin( math.pi / 2 ) ) -- console output: "1.0"

print( string.format( "%f", math.sin( math.pi * 0.5 ) ) )

-- console output: "1.000000"

print( math.min( 56, 4, 76, 23, 2, 76 ) ) -- console output: "2"

local myNumTable = { 15, -4, 76, 32, 10, 21, -76, 63 }

table.sort( myNumTable, function ( a, b ) return math.abs( a ) < math.abs( b ) end )

print( math.abs( myNumTable[ 1 ] ) ) -- console output: "4"

local myNumber = 2 ^ 8 - 1

local fraction, exponent = math.frexp( myNumber )

print( fraction .. " * 2 ^ " .. exponent .. " = " .. fraction .. string.format( " * %i = %i", 2 ^ exponent, myNumber ) )

-- console output: "0.99609375 * 2 ^ 8 = 0.99609375 * 256 = 255"

print( "----- if and inline condition" )

local a, b = 5, 5

if ( a == b ) then

print( a .. " is equal to " .. b ) -- console output: "5 is equal to 5"

elseif ( a > b ) then

print( a .. " is greater than " .. b ) -- console output: "5 is greater than 5"

print( a .. " is less than " .. b ) -- console output: "5 is less than 5"

local c, d = "blue", "red"

if ( c ~= d ) then

print( c .. " is not " .. d ) -- console output: "blue is not red"

print( c .. " is " .. d ) -- console output: "blue is red"

local x, y = 12, 34

print( x .. ( x == y and " is equal to " or " is not equal to " ) .. y )

-- console output: "12 is not equal to 34"

print( "----- while loop" )

a, b = 5, 1

while ( a > b ) do

print( a .. " is still greater than " .. b )

b = b + 1

-- Do not forget about the condition to avoid infinite loops!

print( "----- for loop" )

local start, stop, step = 10, 0, -1

for i = start, stop, step do

print( i .. ( ( i % 2 == 0 ) and " is even" or " is odd" ) )

for i, v in ipairs( { 1, 4, 9, 16, 25 } ) do

print( "Index is " .. i .. ", value is " .. v )

local capitals = { Germany = "Berlin", France = "Paris", Norway = "Oslo",

England = "London", Spain = "Madrid", Ukraine = "Kiew", Austria = "Vienna",

Portugal = "Lisbon", Italy = "Rome", Croatia = "Zagreb" }

print( "Some european countries and their capitals (unsorted):" )

for k, v in pairs( capitals ) do

print( " - The capital of " .. string.format( "% 8s", k ) .. " is " .. v .. "." )

table.sort( capitals )

print( "Some european countries and their capitals (sorted?):" )

for k, v in pairs( capitals ) do

print( " - The capital of " .. string.format( "% 8s", k ) .. " is " .. v .. "." )

print( "----- repeat loop" )

local i = 0

print( "Counter is " .. i )

i = i + 1

-- Do not forget about the condition to avoid infinite loops!

until i > 10

This is free and unencumbered software released into the public domain.

Anyone is free to copy, modify, publish, use, compile, sell, or distribute this

software, either in source code form or as a compiled binary, for any purpose,

commercial or non-commercial, and by any means.

In jurisdictions that recognize copyright laws, the author or authors of this

software dedicate any and all copyright interest in the software to the public

domain. We make this dedication for the benefit of the public at large and to

the detriment of our heirs and successors. We intend this dedication to be an

overt act of relinquishment in perpetuity of all present and future rights to

this software under copyright law.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

SOFTWARE.

For more information, please refer to <https://unlicense.org>

Familiarize with the basics of Lua part two

Drag and drop this ZIP archive to the working directory of SICK AppStudio.

Starting this SampleApp is possible either by running the SensorApp (F5) or

debugging (F7+F10) it. Setting a breakpoint on the first row inside the 'main'

function allows debugging step-by-step after the event 'Engine.OnStarted' has

been emitted. Results can be seen in the image viewer on the DevicePage if

available.

To run this SampleApp a device with SICK Algorithm API and AppEngine >= v2.5.0

is required, e.g. a SIM4000 with latest firmware installed. Alternatively, the

embedded emulator within SICK AppStudio v3.6.0 or higher can be used.

This SampleApp is part of the e-learning training courses for the SICK AppSpace

introduction. Thus, the contained source code will be explained step-by-step and

in more details within this course.

The purpose of this one is to gain further knowledge about the structure and

indexing within the scripting language Lua.

training, introduction, commands, syntax, lua, sampleapp, sick-appspace