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Is there a way to perform “if” check only once instead of every iteration in a loop?
biblatex-dw: Conditional formatting – multiple vs. single citationsDefine command that returns true/false (multiple conditions)Is there a better way to check divisibility in LaTeX?Numerical conditional within tikz keys?
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;
The zNonZero is equal to 0 if #1 is 0, but is equal to 1 if #1 is greater than 0. The problem is, the if check inside the loop is performed every iteration: I need it to be performed only once (for the first iteration). Is there a way to get rid of unneeded checks?
begindocument
parindent0pt
newcountzNonZero
defzLoop#1%
zNonZero1
ifnum#1<1 % HOW TO CHECK THIS ONLY ONCE?
zNonZero0
fi
ifnum#1<5
#1...(thezNonZero)newline
expandafterzLoopexpandafterthenumexpr#1+1relax
fi
zLoop0
enddocument
The "if" check is done 5 times here, but we need it to be done only once:
conditionals
asked 8 hours ago
bp2017bp2017
1,4223 silver badges16 bronze badges
add a comment |
The zNonZero is equal to 0 if #1 is 0, but is equal to 1 if #1 is greater than 0. The problem is, the if check inside the loop is performed every iteration: I need it to be performed only once (for the first iteration). Is there a way to get rid of unneeded checks?
begindocument
parindent0pt
newcountzNonZero
defzLoop#1%
zNonZero1
ifnum#1<1 % HOW TO CHECK THIS ONLY ONCE?
zNonZero0
fi
ifnum#1<5
#1...(thezNonZero)newline
expandafterzLoopexpandafterthenumexpr#1+1relax
fi
zLoop0
enddocument
The "if" check is done 5 times here, but we need it to be done only once:
conditionals
asked 8 hours ago
bp2017bp2017
1,4223 silver badges16 bronze badges
1
Is this your real code or is your actual test more expensive? I don't think this simple test will have any performance impact even for a larger number of iterations.
– siracusa
8 hours ago
You could create two separate functions. One that processes the first iteration and does the "if" check, and something that processes subsequent iterations.
– Werner
8 hours ago
add a comment |
The zNonZero is equal to 0 if #1 is 0, but is equal to 1 if #1 is greater than 0. The problem is, the if check inside the loop is performed every iteration: I need it to be performed only once (for the first iteration). Is there a way to get rid of unneeded checks?
begindocument
parindent0pt
newcountzNonZero
defzLoop#1%
zNonZero1
ifnum#1<1 % HOW TO CHECK THIS ONLY ONCE?
zNonZero0
fi
ifnum#1<5
#1...(thezNonZero)newline
expandafterzLoopexpandafterthenumexpr#1+1relax
fi
zLoop0
enddocument
The "if" check is done 5 times here, but we need it to be done only once:
conditionals
asked 8 hours ago
bp2017bp2017
1,4223 silver badges16 bronze badges
The zNonZero is equal to 0 if #1 is 0, but is equal to 1 if #1 is greater than 0. The problem is, the if check inside the loop is performed every iteration: I need it to be performed only once (for the first iteration). Is there a way to get rid of unneeded checks?
begindocument
parindent0pt
newcountzNonZero
defzLoop#1%
zNonZero1
ifnum#1<1 % HOW TO CHECK THIS ONLY ONCE?
zNonZero0
fi
ifnum#1<5
#1...(thezNonZero)newline
expandafterzLoopexpandafterthenumexpr#1+1relax
fi
zLoop0
enddocument
The "if" check is done 5 times here, but we need it to be done only once:
conditionals
conditionals
asked 8 hours ago
bp2017bp2017
1,4223 silver badges16 bronze badges
asked 8 hours ago
bp2017bp2017
1,4223 silver badges16 bronze badges
asked 8 hours ago
bp2017bp2017
1,4223 silver badges16 bronze badges
asked 8 hours ago
bp2017bp2017
1,4223 silver badges16 bronze badges
asked 8 hours ago
bp2017bp2017
1,4223 silver badges16 bronze badges
1,4223 silver badges16 bronze badges
1
Is this your real code or is your actual test more expensive? I don't think this simple test will have any performance impact even for a larger number of iterations.
– siracusa
8 hours ago
You could create two separate functions. One that processes the first iteration and does the "if" check, and something that processes subsequent iterations.
– Werner
8 hours ago
add a comment |
1
Is this your real code or is your actual test more expensive? I don't think this simple test will have any performance impact even for a larger number of iterations.
– siracusa
8 hours ago
You could create two separate functions. One that processes the first iteration and does the "if" check, and something that processes subsequent iterations.
– Werner
8 hours ago
1
1
Is this your real code or is your actual test more expensive? I don't think this simple test will have any performance impact even for a larger number of iterations.
– siracusa
8 hours ago
Is this your real code or is your actual test more expensive? I don't think this simple test will have any performance impact even for a larger number of iterations.
– siracusa
8 hours ago
You could create two separate functions. One that processes the first iteration and does the "if" check, and something that processes subsequent iterations.
– Werner
8 hours ago
You could create two separate functions. One that processes the first iteration and does the "if" check, and something that processes subsequent iterations.
– Werner
8 hours ago
add a comment |
2 Answers
2
active
oldest
votes
Detach the first conditional.
documentclassarticle
newcountzNonZero
defzLoop#1%
zNonZero=1
zLoopStart#1%
zLoopLoop#1%
defzLoopStart#1%
ifnum#1<1 % HOW TO CHECK THIS ONLY ONCE?
zNonZero=0
fi
defzLoopLoop#1%
ifnum#1<5
#1...(thezNonZero)par
zNonZero=1
expandafterzLoopLoopexpandafterthenumexpr#1+1expandafterrelaxexpandafter%
fi
setlengthparindent0pt
begindocument
zLoop0
enddocument
Note the two more expandafter tokens so the entire conditional is removed before the loop is restarted.
This possibly doesn't qualify, but I'll mention it anyway.
documentclassarticle
usepackagexparse
ExplSyntaxOn
NewExpandableDocumentCommandzLoopm
bp_zloop:n #1
cs_new:Nn bp_zloop:n
int_compare:nT #1 < 5
#1...(int_eval:n int_min:nn #1 1 )par
bp_zloop:f int_eval:n #1 + 1
cs_generate_variant:Nn bp_zloop:n f
ExplSyntaxOff
begindocument
zLoop0
enddocument
answered 6 hours ago
egregegreg
754k90 gold badges1977 silver badges3317 bronze badges
add a comment |
documentclassarticle
begindocument
parindent0pt
newcountzNonZero
newififCheck Checktrue
defzLoop#1%
zNonZero1
ifCheckifnum#1<1 zNonZero0 fiCheckfalsefi
ifnum#1<5
#1...(thezNonZero)newline
expandafterzLoopexpandafterthenumexpr#1+1relax
fi
Checktrue
zLoop0
enddocument
answered 8 hours ago
Red-CloudRed-Cloud
4,6042 silver badges17 bronze badges
...this still performs a conditional checkifCheckwith every call ofzLoop.
– Werner
7 hours ago
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
Detach the first conditional.
documentclassarticle
newcountzNonZero
defzLoop#1%
zNonZero=1
zLoopStart#1%
zLoopLoop#1%
defzLoopStart#1%
ifnum#1<1 % HOW TO CHECK THIS ONLY ONCE?
zNonZero=0
fi
defzLoopLoop#1%
ifnum#1<5
#1...(thezNonZero)par
zNonZero=1
expandafterzLoopLoopexpandafterthenumexpr#1+1expandafterrelaxexpandafter%
fi
setlengthparindent0pt
begindocument
zLoop0
enddocument
Note the two more expandafter tokens so the entire conditional is removed before the loop is restarted.
This possibly doesn't qualify, but I'll mention it anyway.
documentclassarticle
usepackagexparse
ExplSyntaxOn
NewExpandableDocumentCommandzLoopm
bp_zloop:n #1
cs_new:Nn bp_zloop:n
int_compare:nT #1 < 5
#1...(int_eval:n int_min:nn #1 1 )par
bp_zloop:f int_eval:n #1 + 1
cs_generate_variant:Nn bp_zloop:n f
ExplSyntaxOff
begindocument
zLoop0
enddocument
answered 6 hours ago
egregegreg
754k90 gold badges1977 silver badges3317 bronze badges
add a comment |
Detach the first conditional.
documentclassarticle
newcountzNonZero
defzLoop#1%
zNonZero=1
zLoopStart#1%
zLoopLoop#1%
defzLoopStart#1%
ifnum#1<1 % HOW TO CHECK THIS ONLY ONCE?
zNonZero=0
fi
defzLoopLoop#1%
ifnum#1<5
#1...(thezNonZero)par
zNonZero=1
expandafterzLoopLoopexpandafterthenumexpr#1+1expandafterrelaxexpandafter%
fi
setlengthparindent0pt
begindocument
zLoop0
enddocument
Note the two more expandafter tokens so the entire conditional is removed before the loop is restarted.
This possibly doesn't qualify, but I'll mention it anyway.
documentclassarticle
usepackagexparse
ExplSyntaxOn
NewExpandableDocumentCommandzLoopm
bp_zloop:n #1
cs_new:Nn bp_zloop:n
int_compare:nT #1 < 5
#1...(int_eval:n int_min:nn #1 1 )par
bp_zloop:f int_eval:n #1 + 1
cs_generate_variant:Nn bp_zloop:n f
ExplSyntaxOff
begindocument
zLoop0
enddocument
answered 6 hours ago
egregegreg
754k90 gold badges1977 silver badges3317 bronze badges
add a comment |
Detach the first conditional.
documentclassarticle
newcountzNonZero
defzLoop#1%
zNonZero=1
zLoopStart#1%
zLoopLoop#1%
defzLoopStart#1%
ifnum#1<1 % HOW TO CHECK THIS ONLY ONCE?
zNonZero=0
fi
defzLoopLoop#1%
ifnum#1<5
#1...(thezNonZero)par
zNonZero=1
expandafterzLoopLoopexpandafterthenumexpr#1+1expandafterrelaxexpandafter%
fi
setlengthparindent0pt
begindocument
zLoop0
enddocument
Note the two more expandafter tokens so the entire conditional is removed before the loop is restarted.
This possibly doesn't qualify, but I'll mention it anyway.
documentclassarticle
usepackagexparse
ExplSyntaxOn
NewExpandableDocumentCommandzLoopm
bp_zloop:n #1
cs_new:Nn bp_zloop:n
int_compare:nT #1 < 5
#1...(int_eval:n int_min:nn #1 1 )par
bp_zloop:f int_eval:n #1 + 1
cs_generate_variant:Nn bp_zloop:n f
ExplSyntaxOff
begindocument
zLoop0
enddocument
answered 6 hours ago
egregegreg
754k90 gold badges1977 silver badges3317 bronze badges
Detach the first conditional.
documentclassarticle
newcountzNonZero
defzLoop#1%
zNonZero=1
zLoopStart#1%
zLoopLoop#1%
defzLoopStart#1%
ifnum#1<1 % HOW TO CHECK THIS ONLY ONCE?
zNonZero=0
fi
defzLoopLoop#1%
ifnum#1<5
#1...(thezNonZero)par
zNonZero=1
expandafterzLoopLoopexpandafterthenumexpr#1+1expandafterrelaxexpandafter%
fi
setlengthparindent0pt
begindocument
zLoop0
enddocument
Note the two more expandafter tokens so the entire conditional is removed before the loop is restarted.
This possibly doesn't qualify, but I'll mention it anyway.
documentclassarticle
usepackagexparse
ExplSyntaxOn
NewExpandableDocumentCommandzLoopm
bp_zloop:n #1
cs_new:Nn bp_zloop:n
int_compare:nT #1 < 5
#1...(int_eval:n int_min:nn #1 1 )par
bp_zloop:f int_eval:n #1 + 1
cs_generate_variant:Nn bp_zloop:n f
ExplSyntaxOff
begindocument
zLoop0
enddocument
answered 6 hours ago
egregegreg
754k90 gold badges1977 silver badges3317 bronze badges
edited 6 hours ago
answered 6 hours ago
egregegreg
754k90 gold badges1977 silver badges3317 bronze badges
answered 6 hours ago
egregegreg
754k90 gold badges1977 silver badges3317 bronze badges
answered 6 hours ago
egregegreg
754k90 gold badges1977 silver badges3317 bronze badges
754k90 gold badges1977 silver badges3317 bronze badges
add a comment |
add a comment |
documentclassarticle
begindocument
parindent0pt
newcountzNonZero
newififCheck Checktrue
defzLoop#1%
zNonZero1
ifCheckifnum#1<1 zNonZero0 fiCheckfalsefi
ifnum#1<5
#1...(thezNonZero)newline
expandafterzLoopexpandafterthenumexpr#1+1relax
fi
Checktrue
zLoop0
enddocument
answered 8 hours ago
Red-CloudRed-Cloud
4,6042 silver badges17 bronze badges
...this still performs a conditional checkifCheckwith every call ofzLoop.
– Werner
7 hours ago
add a comment |
documentclassarticle
begindocument
parindent0pt
newcountzNonZero
newififCheck Checktrue
defzLoop#1%
zNonZero1
ifCheckifnum#1<1 zNonZero0 fiCheckfalsefi
ifnum#1<5
#1...(thezNonZero)newline
expandafterzLoopexpandafterthenumexpr#1+1relax
fi
Checktrue
zLoop0
enddocument
answered 8 hours ago
Red-CloudRed-Cloud
4,6042 silver badges17 bronze badges
...this still performs a conditional checkifCheckwith every call ofzLoop.
– Werner
7 hours ago
add a comment |
documentclassarticle
begindocument
parindent0pt
newcountzNonZero
newififCheck Checktrue
defzLoop#1%
zNonZero1
ifCheckifnum#1<1 zNonZero0 fiCheckfalsefi
ifnum#1<5
#1...(thezNonZero)newline
expandafterzLoopexpandafterthenumexpr#1+1relax
fi
Checktrue
zLoop0
enddocument
answered 8 hours ago
Red-CloudRed-Cloud
4,6042 silver badges17 bronze badges
documentclassarticle
begindocument
parindent0pt
newcountzNonZero
newififCheck Checktrue
defzLoop#1%
zNonZero1
ifCheckifnum#1<1 zNonZero0 fiCheckfalsefi
ifnum#1<5
#1...(thezNonZero)newline
expandafterzLoopexpandafterthenumexpr#1+1relax
fi
Checktrue
zLoop0
enddocument
answered 8 hours ago
Red-CloudRed-Cloud
4,6042 silver badges17 bronze badges
answered 8 hours ago
Red-CloudRed-Cloud
4,6042 silver badges17 bronze badges
answered 8 hours ago
Red-CloudRed-Cloud
4,6042 silver badges17 bronze badges
answered 8 hours ago
Red-CloudRed-Cloud
4,6042 silver badges17 bronze badges
4,6042 silver badges17 bronze badges
...this still performs a conditional checkifCheckwith every call ofzLoop.
– Werner
7 hours ago
add a comment |
...this still performs a conditional checkifCheckwith every call ofzLoop.
– Werner
7 hours ago
...this still performs a conditional check
ifCheck with every call of zLoop.– Werner
7 hours ago
...this still performs a conditional check
ifCheck with every call of zLoop.– Werner
7 hours ago
add a comment |
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1
Is this your real code or is your actual test more expensive? I don't think this simple test will have any performance impact even for a larger number of iterations.
– siracusa
8 hours ago
You could create two separate functions. One that processes the first iteration and does the "if" check, and something that processes subsequent iterations.
– Werner
8 hours ago