Why does the result of FPeval disappear after a `&`

Clash Royale CLAN TAG#URR8PPP

up vote
3
down vote

favorite

I am trying to use the fp package, and the results are deeply confusing to me:

documentclass[a4paper]article
usepackagefp
begindocument
begintabularr
FPevaltesting2 + 2
a & testing
endtabular
enddocument

This will not compile:

This is pdfTeX, Version 3.14159265-2.6-1.40.19 (TeX Live 2018/Arch Linux) (preloaded format=pdflatex)
 restricted write18 enabled.
entering extended mode
(./mvce.tex
LaTeX2e <2018-04-01> patch level 5
(/usr/share/texmf-dist/tex/latex/base/article.cls
Document Class: article 2014/09/29 v1.4h Standard LaTeX document class
(/usr/share/texmf-dist/tex/latex/base/size10.clo))
(/usr/share/texmf-dist/tex/latex/fp/fp.sty
`Fixed Point Package', Version 0.8, April 2, 1995 (C) Michael Mehlich
(/usr/share/texmf-dist/tex/latex/fp/defpattern.sty)
(/usr/share/texmf-dist/tex/latex/fp/fp-basic.sty)
(/usr/share/texmf-dist/tex/latex/fp/fp-addons.sty)
(/usr/share/texmf-dist/tex/latex/fp/fp-snap.sty)
(/usr/share/texmf-dist/tex/latex/fp/fp-exp.sty)
(/usr/share/texmf-dist/tex/latex/fp/fp-trigo.sty)
(/usr/share/texmf-dist/tex/latex/fp/fp-pas.sty)
(/usr/share/texmf-dist/tex/latex/fp/fp-random.sty)
(/usr/share/texmf-dist/tex/latex/fp/fp-eqn.sty)
(/usr/share/texmf-dist/tex/latex/fp/fp-upn.sty)
(/usr/share/texmf-dist/tex/latex/fp/fp-eval.sty))
No file mvce.aux.
( FP-EVAL ( FP-UPN ( FP-ADD ) ) )
! Undefined control sequence.
l.6 a & testing

However, removing the & will give the intended result. Why does that happen, and what can I do about it? Should I use a different package for arithmetic?

This is just a simplified example. I actually want to use the result multiple times across a & and \ boundary, which is why I can't just move the FPeval where the result is used.

tables fp

share|improve this question

asked 1 hour ago

NieDzejkob

1162

add a comment | 

up vote
3
down vote

favorite

I am trying to use the fp package, and the results are deeply confusing to me:

documentclass[a4paper]article
usepackagefp
begindocument
begintabularr
FPevaltesting2 + 2
a & testing
endtabular
enddocument

This will not compile:

This is pdfTeX, Version 3.14159265-2.6-1.40.19 (TeX Live 2018/Arch Linux) (preloaded format=pdflatex)
 restricted write18 enabled.
entering extended mode
(./mvce.tex
LaTeX2e <2018-04-01> patch level 5
(/usr/share/texmf-dist/tex/latex/base/article.cls
Document Class: article 2014/09/29 v1.4h Standard LaTeX document class
(/usr/share/texmf-dist/tex/latex/base/size10.clo))
(/usr/share/texmf-dist/tex/latex/fp/fp.sty
`Fixed Point Package', Version 0.8, April 2, 1995 (C) Michael Mehlich
(/usr/share/texmf-dist/tex/latex/fp/defpattern.sty)
(/usr/share/texmf-dist/tex/latex/fp/fp-basic.sty)
(/usr/share/texmf-dist/tex/latex/fp/fp-addons.sty)
(/usr/share/texmf-dist/tex/latex/fp/fp-snap.sty)
(/usr/share/texmf-dist/tex/latex/fp/fp-exp.sty)
(/usr/share/texmf-dist/tex/latex/fp/fp-trigo.sty)
(/usr/share/texmf-dist/tex/latex/fp/fp-pas.sty)
(/usr/share/texmf-dist/tex/latex/fp/fp-random.sty)
(/usr/share/texmf-dist/tex/latex/fp/fp-eqn.sty)
(/usr/share/texmf-dist/tex/latex/fp/fp-upn.sty)
(/usr/share/texmf-dist/tex/latex/fp/fp-eval.sty))
No file mvce.aux.
( FP-EVAL ( FP-UPN ( FP-ADD ) ) )
! Undefined control sequence.
l.6 a & testing

However, removing the & will give the intended result. Why does that happen, and what can I do about it? Should I use a different package for arithmetic?

This is just a simplified example. I actually want to use the result multiple times across a & and \ boundary, which is why I can't just move the FPeval where the result is used.

tables fp

share|improve this question

asked 1 hour ago

NieDzejkob

1162

add a comment | 

up vote
3
down vote

favorite

up vote
3
down vote

favorite

I am trying to use the fp package, and the results are deeply confusing to me:

documentclass[a4paper]article
usepackagefp
begindocument
begintabularr
FPevaltesting2 + 2
a & testing
endtabular
enddocument

This will not compile:

This is pdfTeX, Version 3.14159265-2.6-1.40.19 (TeX Live 2018/Arch Linux) (preloaded format=pdflatex)
 restricted write18 enabled.
entering extended mode
(./mvce.tex
LaTeX2e <2018-04-01> patch level 5
(/usr/share/texmf-dist/tex/latex/base/article.cls
Document Class: article 2014/09/29 v1.4h Standard LaTeX document class
(/usr/share/texmf-dist/tex/latex/base/size10.clo))
(/usr/share/texmf-dist/tex/latex/fp/fp.sty
`Fixed Point Package', Version 0.8, April 2, 1995 (C) Michael Mehlich
(/usr/share/texmf-dist/tex/latex/fp/defpattern.sty)
(/usr/share/texmf-dist/tex/latex/fp/fp-basic.sty)
(/usr/share/texmf-dist/tex/latex/fp/fp-addons.sty)
(/usr/share/texmf-dist/tex/latex/fp/fp-snap.sty)
(/usr/share/texmf-dist/tex/latex/fp/fp-exp.sty)
(/usr/share/texmf-dist/tex/latex/fp/fp-trigo.sty)
(/usr/share/texmf-dist/tex/latex/fp/fp-pas.sty)
(/usr/share/texmf-dist/tex/latex/fp/fp-random.sty)
(/usr/share/texmf-dist/tex/latex/fp/fp-eqn.sty)
(/usr/share/texmf-dist/tex/latex/fp/fp-upn.sty)
(/usr/share/texmf-dist/tex/latex/fp/fp-eval.sty))
No file mvce.aux.
( FP-EVAL ( FP-UPN ( FP-ADD ) ) )
! Undefined control sequence.
l.6 a & testing

However, removing the & will give the intended result. Why does that happen, and what can I do about it? Should I use a different package for arithmetic?

This is just a simplified example. I actually want to use the result multiple times across a & and \ boundary, which is why I can't just move the FPeval where the result is used.

tables fp

share|improve this question

asked 1 hour ago

NieDzejkob

1162

I am trying to use the fp package, and the results are deeply confusing to me:

documentclass[a4paper]article
usepackagefp
begindocument
begintabularr
FPevaltesting2 + 2
a & testing
endtabular
enddocument

This will not compile:

This is pdfTeX, Version 3.14159265-2.6-1.40.19 (TeX Live 2018/Arch Linux) (preloaded format=pdflatex)
 restricted write18 enabled.
entering extended mode
(./mvce.tex
LaTeX2e <2018-04-01> patch level 5
(/usr/share/texmf-dist/tex/latex/base/article.cls
Document Class: article 2014/09/29 v1.4h Standard LaTeX document class
(/usr/share/texmf-dist/tex/latex/base/size10.clo))
(/usr/share/texmf-dist/tex/latex/fp/fp.sty
`Fixed Point Package', Version 0.8, April 2, 1995 (C) Michael Mehlich
(/usr/share/texmf-dist/tex/latex/fp/defpattern.sty)
(/usr/share/texmf-dist/tex/latex/fp/fp-basic.sty)
(/usr/share/texmf-dist/tex/latex/fp/fp-addons.sty)
(/usr/share/texmf-dist/tex/latex/fp/fp-snap.sty)
(/usr/share/texmf-dist/tex/latex/fp/fp-exp.sty)
(/usr/share/texmf-dist/tex/latex/fp/fp-trigo.sty)
(/usr/share/texmf-dist/tex/latex/fp/fp-pas.sty)
(/usr/share/texmf-dist/tex/latex/fp/fp-random.sty)
(/usr/share/texmf-dist/tex/latex/fp/fp-eqn.sty)
(/usr/share/texmf-dist/tex/latex/fp/fp-upn.sty)
(/usr/share/texmf-dist/tex/latex/fp/fp-eval.sty))
No file mvce.aux.
( FP-EVAL ( FP-UPN ( FP-ADD ) ) )
! Undefined control sequence.
l.6 a & testing

However, removing the & will give the intended result. Why does that happen, and what can I do about it? Should I use a different package for arithmetic?

This is just a simplified example. I actually want to use the result multiple times across a & and \ boundary, which is why I can't just move the FPeval where the result is used.

tables fp

tables fp

share|improve this question

asked 1 hour ago

NieDzejkob

1162

share|improve this question

asked 1 hour ago

NieDzejkob

1162

share|improve this question

share|improve this question

asked 1 hour ago

NieDzejkob

1162

asked 1 hour ago

NieDzejkob

1162

asked 1 hour ago

NieDzejkob

1162

1162

add a comment | 

add a comment | 

1 Answer
1

active

oldest

votes

up vote
5
down vote

testing is a local variable, lost in the local scope (corresponding to each cell of the tabular). You need to set it global to use it in a different cell, or outside the tabular.

documentclass[a4paper]article
usepackagefp
begindocument
begintabularr
FPevaltesting2 + 2globallettestingtesting
a & testing
endtabular

Look, I am even available outside the tabular: testing
enddocument

share|improve this answer

edited 5 mins ago

answered 1 hour ago

Steven B. Segletes

148k9187392

• 
  
  
  

  
  

  
  
  
  
  
  

  
  Isn't it more the cells than the tabular env? Each cell in a table is a local group.
  – daleif
  16 mins ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  I believe that's what I need, thanks. Are there any other scopes than global? For example, is it possible to make the variable's scope be the interior of a newcommand definition? Could I wrap this construction into a macro, to avoid typing it out every time? Something like myevalglobaltesting2 + 2
  – NieDzejkob
  15 mins ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  @daleif That is what I meant, but I see how it can be confused...I will edit to clarify.
  – Steven B. Segletes
  6 mins ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  @NieDzejkob There are only local and global scopes. With extra work, you could save a global variable, change it as you wish, and then reset it back to the earlier value, but why spend the effort? That said, you could certainly define a gFPeval that accomplishes both the FPeval and the globalization.
  – Steven B. Segletes
  2 mins ago
  

  
  
  
  

add a comment | 

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1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

active

oldest

votes

active

oldest

votes

up vote
5
down vote

testing is a local variable, lost in the local scope (corresponding to each cell of the tabular). You need to set it global to use it in a different cell, or outside the tabular.

documentclass[a4paper]article
usepackagefp
begindocument
begintabularr
FPevaltesting2 + 2globallettestingtesting
a & testing
endtabular

Look, I am even available outside the tabular: testing
enddocument

share|improve this answer

edited 5 mins ago

answered 1 hour ago

Steven B. Segletes

148k9187392

• 
  
  
  

  
  

  
  
  
  
  
  

  
  Isn't it more the cells than the tabular env? Each cell in a table is a local group.
  – daleif
  16 mins ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  I believe that's what I need, thanks. Are there any other scopes than global? For example, is it possible to make the variable's scope be the interior of a newcommand definition? Could I wrap this construction into a macro, to avoid typing it out every time? Something like myevalglobaltesting2 + 2
  – NieDzejkob
  15 mins ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  @daleif That is what I meant, but I see how it can be confused...I will edit to clarify.
  – Steven B. Segletes
  6 mins ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  @NieDzejkob There are only local and global scopes. With extra work, you could save a global variable, change it as you wish, and then reset it back to the earlier value, but why spend the effort? That said, you could certainly define a gFPeval that accomplishes both the FPeval and the globalization.
  – Steven B. Segletes
  2 mins ago
  

  
  
  
  

add a comment | 

up vote
5
down vote

testing is a local variable, lost in the local scope (corresponding to each cell of the tabular). You need to set it global to use it in a different cell, or outside the tabular.

documentclass[a4paper]article
usepackagefp
begindocument
begintabularr
FPevaltesting2 + 2globallettestingtesting
a & testing
endtabular

Look, I am even available outside the tabular: testing
enddocument

share|improve this answer

edited 5 mins ago

answered 1 hour ago

Steven B. Segletes

148k9187392

• 
  
  
  

  
  

  
  
  
  
  
  

  
  Isn't it more the cells than the tabular env? Each cell in a table is a local group.
  – daleif
  16 mins ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  I believe that's what I need, thanks. Are there any other scopes than global? For example, is it possible to make the variable's scope be the interior of a newcommand definition? Could I wrap this construction into a macro, to avoid typing it out every time? Something like myevalglobaltesting2 + 2
  – NieDzejkob
  15 mins ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  @daleif That is what I meant, but I see how it can be confused...I will edit to clarify.
  – Steven B. Segletes
  6 mins ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  @NieDzejkob There are only local and global scopes. With extra work, you could save a global variable, change it as you wish, and then reset it back to the earlier value, but why spend the effort? That said, you could certainly define a gFPeval that accomplishes both the FPeval and the globalization.
  – Steven B. Segletes
  2 mins ago
  

  
  
  
  

add a comment | 

up vote
5
down vote

up vote
5
down vote

testing is a local variable, lost in the local scope (corresponding to each cell of the tabular). You need to set it global to use it in a different cell, or outside the tabular.

documentclass[a4paper]article
usepackagefp
begindocument
begintabularr
FPevaltesting2 + 2globallettestingtesting
a & testing
endtabular

Look, I am even available outside the tabular: testing
enddocument

share|improve this answer

edited 5 mins ago

answered 1 hour ago

Steven B. Segletes

148k9187392

testing is a local variable, lost in the local scope (corresponding to each cell of the tabular). You need to set it global to use it in a different cell, or outside the tabular.

documentclass[a4paper]article
usepackagefp
begindocument
begintabularr
FPevaltesting2 + 2globallettestingtesting
a & testing
endtabular

Look, I am even available outside the tabular: testing
enddocument

share|improve this answer

edited 5 mins ago

answered 1 hour ago

Steven B. Segletes

148k9187392

share|improve this answer

share|improve this answer

edited 5 mins ago

edited 5 mins ago

edited 5 mins ago

answered 1 hour ago

Steven B. Segletes

148k9187392

answered 1 hour ago

Steven B. Segletes

148k9187392

answered 1 hour ago

Steven B. Segletes

148k9187392

148k9187392

• 
  
  
  

  
  

  
  
  
  
  
  

  
  Isn't it more the cells than the tabular env? Each cell in a table is a local group.
  – daleif
  16 mins ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  I believe that's what I need, thanks. Are there any other scopes than global? For example, is it possible to make the variable's scope be the interior of a newcommand definition? Could I wrap this construction into a macro, to avoid typing it out every time? Something like myevalglobaltesting2 + 2
  – NieDzejkob
  15 mins ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  @daleif That is what I meant, but I see how it can be confused...I will edit to clarify.
  – Steven B. Segletes
  6 mins ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  @NieDzejkob There are only local and global scopes. With extra work, you could save a global variable, change it as you wish, and then reset it back to the earlier value, but why spend the effort? That said, you could certainly define a gFPeval that accomplishes both the FPeval and the globalization.
  – Steven B. Segletes
  2 mins ago
  

  
  
  
  

add a comment | 

• 
  
  
  

  
  

  
  
  
  
  
  

  
  Isn't it more the cells than the tabular env? Each cell in a table is a local group.
  – daleif
  16 mins ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  I believe that's what I need, thanks. Are there any other scopes than global? For example, is it possible to make the variable's scope be the interior of a newcommand definition? Could I wrap this construction into a macro, to avoid typing it out every time? Something like myevalglobaltesting2 + 2
  – NieDzejkob
  15 mins ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  @daleif That is what I meant, but I see how it can be confused...I will edit to clarify.
  – Steven B. Segletes
  6 mins ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  @NieDzejkob There are only local and global scopes. With extra work, you could save a global variable, change it as you wish, and then reset it back to the earlier value, but why spend the effort? That said, you could certainly define a gFPeval that accomplishes both the FPeval and the globalization.
  – Steven B. Segletes
  2 mins ago
  

  
  
  
  

Isn't it more the cells than the tabular env? Each cell in a table is a local group.
– daleif
16 mins ago

Isn't it more the cells than the tabular env? Each cell in a table is a local group.
– daleif
16 mins ago

I believe that's what I need, thanks. Are there any other scopes than global? For example, is it possible to make the variable's scope be the interior of a newcommand definition? Could I wrap this construction into a macro, to avoid typing it out every time? Something like myevalglobaltesting2 + 2
– NieDzejkob
15 mins ago

I believe that's what I need, thanks. Are there any other scopes than global? For example, is it possible to make the variable's scope be the interior of a newcommand definition? Could I wrap this construction into a macro, to avoid typing it out every time? Something like myevalglobaltesting2 + 2
– NieDzejkob
15 mins ago

1

1

@daleif That is what I meant, but I see how it can be confused...I will edit to clarify.
– Steven B. Segletes
6 mins ago

@daleif That is what I meant, but I see how it can be confused...I will edit to clarify.
– Steven B. Segletes
6 mins ago

@NieDzejkob There are only local and global scopes. With extra work, you could save a global variable, change it as you wish, and then reset it back to the earlier value, but why spend the effort? That said, you could certainly define a gFPeval that accomplishes both the FPeval and the globalization.
– Steven B. Segletes
2 mins ago

@NieDzejkob There are only local and global scopes. With extra work, you could save a global variable, change it as you wish, and then reset it back to the earlier value, but why spend the effort? That said, you could certainly define a gFPeval that accomplishes both the FPeval and the globalization.
– Steven B. Segletes
2 mins ago

add a comment | 

 

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