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The function I'm trying to create is one that takes two numbers and prints the result with some math. The following is my code:
documentclass[12pt,a4paper]article
begindocument
directlua
function prod(a,b)
tex.print(a "$times$" b "$=$" a*c)
end
The product of 2 and 3: directluaprod(2,3).
enddocument
I can't make it print the whole statement correctly. How to solve it?
luatex calculations
add a comment |
The function I'm trying to create is one that takes two numbers and prints the result with some math. The following is my code:
documentclass[12pt,a4paper]article
begindocument
directlua
function prod(a,b)
tex.print(a "$times$" b "$=$" a*c)
end
The product of 2 and 3: directluaprod(2,3).
enddocument
I can't make it print the whole statement correctly. How to solve it?
luatex calculations
3
Trytex.print("$" .. a .. "string\times" .. b .. "=" .. a*b .. "$")
– moewe
8 hours ago
1
Unlike TeX, to which everything is (by default) a token to be typeset so you can simply write "hello world" and have those words appear in the typeset output, Lua is a general-purpose programming language in which something likea b
is a syntax error (assuminga
andb
are variables). Here,tex.print
is a Lua function that takes a single string as input, so you need to give it a single string. (There are other forms oftex.print
too, that you can read in the LuaTeX manual, but those are probably not what you want.) Lua uses..
to concatenate strings.
– ShreevatsaR
8 hours ago
2
BTW instead of concatenating different strings with..
, you can also usestring.format
to build a string, e.g. in a filetest.lua
putfunction prod(a,b) tex.print(string.format([[$%d times %d = %d$]], a, b, a*b)) end
and in your file dodirectluadofile('test.lua')
-- here the[[
instead of"
is to avoid needing to escape the backslash intimes
.
– ShreevatsaR
8 hours ago
@ShreevatsaR Thanks for that option!
– Levy
7 hours ago
add a comment |
The function I'm trying to create is one that takes two numbers and prints the result with some math. The following is my code:
documentclass[12pt,a4paper]article
begindocument
directlua
function prod(a,b)
tex.print(a "$times$" b "$=$" a*c)
end
The product of 2 and 3: directluaprod(2,3).
enddocument
I can't make it print the whole statement correctly. How to solve it?
luatex calculations
The function I'm trying to create is one that takes two numbers and prints the result with some math. The following is my code:
documentclass[12pt,a4paper]article
begindocument
directlua
function prod(a,b)
tex.print(a "$times$" b "$=$" a*c)
end
The product of 2 and 3: directluaprod(2,3).
enddocument
I can't make it print the whole statement correctly. How to solve it?
luatex calculations
luatex calculations
edited 7 hours ago
Mico
285k31388778
285k31388778
asked 8 hours ago
LevyLevy
437312
437312
3
Trytex.print("$" .. a .. "string\times" .. b .. "=" .. a*b .. "$")
– moewe
8 hours ago
1
Unlike TeX, to which everything is (by default) a token to be typeset so you can simply write "hello world" and have those words appear in the typeset output, Lua is a general-purpose programming language in which something likea b
is a syntax error (assuminga
andb
are variables). Here,tex.print
is a Lua function that takes a single string as input, so you need to give it a single string. (There are other forms oftex.print
too, that you can read in the LuaTeX manual, but those are probably not what you want.) Lua uses..
to concatenate strings.
– ShreevatsaR
8 hours ago
2
BTW instead of concatenating different strings with..
, you can also usestring.format
to build a string, e.g. in a filetest.lua
putfunction prod(a,b) tex.print(string.format([[$%d times %d = %d$]], a, b, a*b)) end
and in your file dodirectluadofile('test.lua')
-- here the[[
instead of"
is to avoid needing to escape the backslash intimes
.
– ShreevatsaR
8 hours ago
@ShreevatsaR Thanks for that option!
– Levy
7 hours ago
add a comment |
3
Trytex.print("$" .. a .. "string\times" .. b .. "=" .. a*b .. "$")
– moewe
8 hours ago
1
Unlike TeX, to which everything is (by default) a token to be typeset so you can simply write "hello world" and have those words appear in the typeset output, Lua is a general-purpose programming language in which something likea b
is a syntax error (assuminga
andb
are variables). Here,tex.print
is a Lua function that takes a single string as input, so you need to give it a single string. (There are other forms oftex.print
too, that you can read in the LuaTeX manual, but those are probably not what you want.) Lua uses..
to concatenate strings.
– ShreevatsaR
8 hours ago
2
BTW instead of concatenating different strings with..
, you can also usestring.format
to build a string, e.g. in a filetest.lua
putfunction prod(a,b) tex.print(string.format([[$%d times %d = %d$]], a, b, a*b)) end
and in your file dodirectluadofile('test.lua')
-- here the[[
instead of"
is to avoid needing to escape the backslash intimes
.
– ShreevatsaR
8 hours ago
@ShreevatsaR Thanks for that option!
– Levy
7 hours ago
3
3
Try
tex.print("$" .. a .. "string\times" .. b .. "=" .. a*b .. "$")
– moewe
8 hours ago
Try
tex.print("$" .. a .. "string\times" .. b .. "=" .. a*b .. "$")
– moewe
8 hours ago
1
1
Unlike TeX, to which everything is (by default) a token to be typeset so you can simply write "hello world" and have those words appear in the typeset output, Lua is a general-purpose programming language in which something like
a b
is a syntax error (assuming a
and b
are variables). Here, tex.print
is a Lua function that takes a single string as input, so you need to give it a single string. (There are other forms of tex.print
too, that you can read in the LuaTeX manual, but those are probably not what you want.) Lua uses ..
to concatenate strings.– ShreevatsaR
8 hours ago
Unlike TeX, to which everything is (by default) a token to be typeset so you can simply write "hello world" and have those words appear in the typeset output, Lua is a general-purpose programming language in which something like
a b
is a syntax error (assuming a
and b
are variables). Here, tex.print
is a Lua function that takes a single string as input, so you need to give it a single string. (There are other forms of tex.print
too, that you can read in the LuaTeX manual, but those are probably not what you want.) Lua uses ..
to concatenate strings.– ShreevatsaR
8 hours ago
2
2
BTW instead of concatenating different strings with
..
, you can also use string.format
to build a string, e.g. in a file test.lua
put function prod(a,b) tex.print(string.format([[$%d times %d = %d$]], a, b, a*b)) end
and in your file do directluadofile('test.lua')
-- here the [[
instead of "
is to avoid needing to escape the backslash in times
.– ShreevatsaR
8 hours ago
BTW instead of concatenating different strings with
..
, you can also use string.format
to build a string, e.g. in a file test.lua
put function prod(a,b) tex.print(string.format([[$%d times %d = %d$]], a, b, a*b)) end
and in your file do directluadofile('test.lua')
-- here the [[
instead of "
is to avoid needing to escape the backslash in times
.– ShreevatsaR
8 hours ago
@ShreevatsaR Thanks for that option!
– Levy
7 hours ago
@ShreevatsaR Thanks for that option!
– Levy
7 hours ago
add a comment |
3 Answers
3
active
oldest
votes
documentclass[12pt,a4paper]article
directlua
function prod(a,b)
tex.print("$" .. a .. "string\times" .. b .. "=" .. a*b .. "$")
end
begindocument
The product of 2 and 3: directluaprod(2,3).
enddocument
One tricky thing is getting the backslash escaping game right: LuaTeX: How to handle a Lua function that prints TeX macros. directlua
expands macros before passing them on to Lua, so times
gets messed up. But something like stringtimes
, which should stop that expansion does not quite work as intended because t
is a special escape for the tab in Lua. Hence we need to escape the backslash there. In Lua you would have to type \times
, but in TeX we need to stop the \
from being expanded, so we need string\times
. That is one of the reasons why it is often recommended to use the luacode
package or externalise Lua functions into their own .lua
files and then load them with dofile
or require
(see for example How to do a 'printline' in LuaTeX, a bit on dofile
and require
can be found at LuaLatex: Difference between `dofile` and `require` when loading lua files).
Another thing is that you need ..
to concatenate strings.
Finally, you probably want the entire expression in math mode and not just certain bits.
Also moved the directlua
function definition into the preamble. (Thanks to Mico for the suggestion.)
That's what I was looking for. It worked here. Thank you!
– Levy
8 hours ago
And the explanation was really helpful!
– Levy
8 hours ago
add a comment |
documentclass[12pt,a4paper]article
begindocument
directlua
function prod(a,b)
tex.print(a.. "$string\times$".. b.. "$=$".. a*b)
end
The product of 2 and 3: directluaprod(2,3).
enddocument
add a comment |
Just for completeness, here's a solution that shows how to (a) write the Lua code to an external file, (b) load the Luacode via a directluadofile("...")
directive, and (c) set up a LaTeX "wrapper" macro (called showprod
in the example below) whose function (pun intended) is to invoke the Lua function.
Note that with this setup, one can write \
rather than string\
to denote a single backslash character. (This is also the case for the luacode
and luacode*
environments that are provided by the luacode
package.)
RequirePackagefilecontents
beginfilecontents*show_prod.lua
function show_prod ( a , b )
tex.sprint ( "$"..a.."\times"..b.."="..a*b.."$" )
end
endfilecontents*
documentclassarticle
%% Load Lua code from external file and define a LaTeX "wrapper" macro
directluadofile("show_prod.lua")
newcommandshowprod[2]directluashow_prod(#1,#2)
begindocument
The product of 2 and 3: showprod23.
enddocument
add a comment |
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3 Answers
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oldest
votes
3 Answers
3
active
oldest
votes
active
oldest
votes
active
oldest
votes
documentclass[12pt,a4paper]article
directlua
function prod(a,b)
tex.print("$" .. a .. "string\times" .. b .. "=" .. a*b .. "$")
end
begindocument
The product of 2 and 3: directluaprod(2,3).
enddocument
One tricky thing is getting the backslash escaping game right: LuaTeX: How to handle a Lua function that prints TeX macros. directlua
expands macros before passing them on to Lua, so times
gets messed up. But something like stringtimes
, which should stop that expansion does not quite work as intended because t
is a special escape for the tab in Lua. Hence we need to escape the backslash there. In Lua you would have to type \times
, but in TeX we need to stop the \
from being expanded, so we need string\times
. That is one of the reasons why it is often recommended to use the luacode
package or externalise Lua functions into their own .lua
files and then load them with dofile
or require
(see for example How to do a 'printline' in LuaTeX, a bit on dofile
and require
can be found at LuaLatex: Difference between `dofile` and `require` when loading lua files).
Another thing is that you need ..
to concatenate strings.
Finally, you probably want the entire expression in math mode and not just certain bits.
Also moved the directlua
function definition into the preamble. (Thanks to Mico for the suggestion.)
That's what I was looking for. It worked here. Thank you!
– Levy
8 hours ago
And the explanation was really helpful!
– Levy
8 hours ago
add a comment |
documentclass[12pt,a4paper]article
directlua
function prod(a,b)
tex.print("$" .. a .. "string\times" .. b .. "=" .. a*b .. "$")
end
begindocument
The product of 2 and 3: directluaprod(2,3).
enddocument
One tricky thing is getting the backslash escaping game right: LuaTeX: How to handle a Lua function that prints TeX macros. directlua
expands macros before passing them on to Lua, so times
gets messed up. But something like stringtimes
, which should stop that expansion does not quite work as intended because t
is a special escape for the tab in Lua. Hence we need to escape the backslash there. In Lua you would have to type \times
, but in TeX we need to stop the \
from being expanded, so we need string\times
. That is one of the reasons why it is often recommended to use the luacode
package or externalise Lua functions into their own .lua
files and then load them with dofile
or require
(see for example How to do a 'printline' in LuaTeX, a bit on dofile
and require
can be found at LuaLatex: Difference between `dofile` and `require` when loading lua files).
Another thing is that you need ..
to concatenate strings.
Finally, you probably want the entire expression in math mode and not just certain bits.
Also moved the directlua
function definition into the preamble. (Thanks to Mico for the suggestion.)
That's what I was looking for. It worked here. Thank you!
– Levy
8 hours ago
And the explanation was really helpful!
– Levy
8 hours ago
add a comment |
documentclass[12pt,a4paper]article
directlua
function prod(a,b)
tex.print("$" .. a .. "string\times" .. b .. "=" .. a*b .. "$")
end
begindocument
The product of 2 and 3: directluaprod(2,3).
enddocument
One tricky thing is getting the backslash escaping game right: LuaTeX: How to handle a Lua function that prints TeX macros. directlua
expands macros before passing them on to Lua, so times
gets messed up. But something like stringtimes
, which should stop that expansion does not quite work as intended because t
is a special escape for the tab in Lua. Hence we need to escape the backslash there. In Lua you would have to type \times
, but in TeX we need to stop the \
from being expanded, so we need string\times
. That is one of the reasons why it is often recommended to use the luacode
package or externalise Lua functions into their own .lua
files and then load them with dofile
or require
(see for example How to do a 'printline' in LuaTeX, a bit on dofile
and require
can be found at LuaLatex: Difference between `dofile` and `require` when loading lua files).
Another thing is that you need ..
to concatenate strings.
Finally, you probably want the entire expression in math mode and not just certain bits.
Also moved the directlua
function definition into the preamble. (Thanks to Mico for the suggestion.)
documentclass[12pt,a4paper]article
directlua
function prod(a,b)
tex.print("$" .. a .. "string\times" .. b .. "=" .. a*b .. "$")
end
begindocument
The product of 2 and 3: directluaprod(2,3).
enddocument
One tricky thing is getting the backslash escaping game right: LuaTeX: How to handle a Lua function that prints TeX macros. directlua
expands macros before passing them on to Lua, so times
gets messed up. But something like stringtimes
, which should stop that expansion does not quite work as intended because t
is a special escape for the tab in Lua. Hence we need to escape the backslash there. In Lua you would have to type \times
, but in TeX we need to stop the \
from being expanded, so we need string\times
. That is one of the reasons why it is often recommended to use the luacode
package or externalise Lua functions into their own .lua
files and then load them with dofile
or require
(see for example How to do a 'printline' in LuaTeX, a bit on dofile
and require
can be found at LuaLatex: Difference between `dofile` and `require` when loading lua files).
Another thing is that you need ..
to concatenate strings.
Finally, you probably want the entire expression in math mode and not just certain bits.
Also moved the directlua
function definition into the preamble. (Thanks to Mico for the suggestion.)
edited 7 hours ago
answered 8 hours ago
moewemoewe
96.2k10117360
96.2k10117360
That's what I was looking for. It worked here. Thank you!
– Levy
8 hours ago
And the explanation was really helpful!
– Levy
8 hours ago
add a comment |
That's what I was looking for. It worked here. Thank you!
– Levy
8 hours ago
And the explanation was really helpful!
– Levy
8 hours ago
That's what I was looking for. It worked here. Thank you!
– Levy
8 hours ago
That's what I was looking for. It worked here. Thank you!
– Levy
8 hours ago
And the explanation was really helpful!
– Levy
8 hours ago
And the explanation was really helpful!
– Levy
8 hours ago
add a comment |
documentclass[12pt,a4paper]article
begindocument
directlua
function prod(a,b)
tex.print(a.. "$string\times$".. b.. "$=$".. a*b)
end
The product of 2 and 3: directluaprod(2,3).
enddocument
add a comment |
documentclass[12pt,a4paper]article
begindocument
directlua
function prod(a,b)
tex.print(a.. "$string\times$".. b.. "$=$".. a*b)
end
The product of 2 and 3: directluaprod(2,3).
enddocument
add a comment |
documentclass[12pt,a4paper]article
begindocument
directlua
function prod(a,b)
tex.print(a.. "$string\times$".. b.. "$=$".. a*b)
end
The product of 2 and 3: directluaprod(2,3).
enddocument
documentclass[12pt,a4paper]article
begindocument
directlua
function prod(a,b)
tex.print(a.. "$string\times$".. b.. "$=$".. a*b)
end
The product of 2 and 3: directluaprod(2,3).
enddocument
answered 8 hours ago
Ulrike FischerUlrike Fischer
198k9305692
198k9305692
add a comment |
add a comment |
Just for completeness, here's a solution that shows how to (a) write the Lua code to an external file, (b) load the Luacode via a directluadofile("...")
directive, and (c) set up a LaTeX "wrapper" macro (called showprod
in the example below) whose function (pun intended) is to invoke the Lua function.
Note that with this setup, one can write \
rather than string\
to denote a single backslash character. (This is also the case for the luacode
and luacode*
environments that are provided by the luacode
package.)
RequirePackagefilecontents
beginfilecontents*show_prod.lua
function show_prod ( a , b )
tex.sprint ( "$"..a.."\times"..b.."="..a*b.."$" )
end
endfilecontents*
documentclassarticle
%% Load Lua code from external file and define a LaTeX "wrapper" macro
directluadofile("show_prod.lua")
newcommandshowprod[2]directluashow_prod(#1,#2)
begindocument
The product of 2 and 3: showprod23.
enddocument
add a comment |
Just for completeness, here's a solution that shows how to (a) write the Lua code to an external file, (b) load the Luacode via a directluadofile("...")
directive, and (c) set up a LaTeX "wrapper" macro (called showprod
in the example below) whose function (pun intended) is to invoke the Lua function.
Note that with this setup, one can write \
rather than string\
to denote a single backslash character. (This is also the case for the luacode
and luacode*
environments that are provided by the luacode
package.)
RequirePackagefilecontents
beginfilecontents*show_prod.lua
function show_prod ( a , b )
tex.sprint ( "$"..a.."\times"..b.."="..a*b.."$" )
end
endfilecontents*
documentclassarticle
%% Load Lua code from external file and define a LaTeX "wrapper" macro
directluadofile("show_prod.lua")
newcommandshowprod[2]directluashow_prod(#1,#2)
begindocument
The product of 2 and 3: showprod23.
enddocument
add a comment |
Just for completeness, here's a solution that shows how to (a) write the Lua code to an external file, (b) load the Luacode via a directluadofile("...")
directive, and (c) set up a LaTeX "wrapper" macro (called showprod
in the example below) whose function (pun intended) is to invoke the Lua function.
Note that with this setup, one can write \
rather than string\
to denote a single backslash character. (This is also the case for the luacode
and luacode*
environments that are provided by the luacode
package.)
RequirePackagefilecontents
beginfilecontents*show_prod.lua
function show_prod ( a , b )
tex.sprint ( "$"..a.."\times"..b.."="..a*b.."$" )
end
endfilecontents*
documentclassarticle
%% Load Lua code from external file and define a LaTeX "wrapper" macro
directluadofile("show_prod.lua")
newcommandshowprod[2]directluashow_prod(#1,#2)
begindocument
The product of 2 and 3: showprod23.
enddocument
Just for completeness, here's a solution that shows how to (a) write the Lua code to an external file, (b) load the Luacode via a directluadofile("...")
directive, and (c) set up a LaTeX "wrapper" macro (called showprod
in the example below) whose function (pun intended) is to invoke the Lua function.
Note that with this setup, one can write \
rather than string\
to denote a single backslash character. (This is also the case for the luacode
and luacode*
environments that are provided by the luacode
package.)
RequirePackagefilecontents
beginfilecontents*show_prod.lua
function show_prod ( a , b )
tex.sprint ( "$"..a.."\times"..b.."="..a*b.."$" )
end
endfilecontents*
documentclassarticle
%% Load Lua code from external file and define a LaTeX "wrapper" macro
directluadofile("show_prod.lua")
newcommandshowprod[2]directluashow_prod(#1,#2)
begindocument
The product of 2 and 3: showprod23.
enddocument
answered 7 hours ago
MicoMico
285k31388778
285k31388778
add a comment |
add a comment |
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3
Try
tex.print("$" .. a .. "string\times" .. b .. "=" .. a*b .. "$")
– moewe
8 hours ago
1
Unlike TeX, to which everything is (by default) a token to be typeset so you can simply write "hello world" and have those words appear in the typeset output, Lua is a general-purpose programming language in which something like
a b
is a syntax error (assuminga
andb
are variables). Here,tex.print
is a Lua function that takes a single string as input, so you need to give it a single string. (There are other forms oftex.print
too, that you can read in the LuaTeX manual, but those are probably not what you want.) Lua uses..
to concatenate strings.– ShreevatsaR
8 hours ago
2
BTW instead of concatenating different strings with
..
, you can also usestring.format
to build a string, e.g. in a filetest.lua
putfunction prod(a,b) tex.print(string.format([[$%d times %d = %d$]], a, b, a*b)) end
and in your file dodirectluadofile('test.lua')
-- here the[[
instead of"
is to avoid needing to escape the backslash intimes
.– ShreevatsaR
8 hours ago
@ShreevatsaR Thanks for that option!
– Levy
7 hours ago