Efficient way to join elements under a conditional
2
$begingroup$
I am solving a certain challenge given by my friend.
I want to print the first day of the year if it is not a leap year, while I want both first and second days if it is a leap year.
I want to know if there is an efficient way to rewrite this piece of code:
If[Mod[year,4]==0,DayName/@{{year,1,1},{year,1,2}},{DayName[{year,1,1}]}]
list-manipulation
asked Dec 3 '18 at 20:02
Exp ikxExp ikx
1486
$endgroup$
add a comment |
2
$begingroup$
I am solving a certain challenge given by my friend.
I want to print the first day of the year if it is not a leap year, while I want both first and second days if it is a leap year.
I want to know if there is an efficient way to rewrite this piece of code:
If[Mod[year,4]==0,DayName/@{{year,1,1},{year,1,2}},{DayName[{year,1,1}]}]
list-manipulation
asked Dec 3 '18 at 20:02
Exp ikxExp ikx
1486
$endgroup$
1
$begingroup$
As an aside: leap years are not years which are multiples of 4, the definition is slightly more complex
$endgroup$
– Lonidard
Dec 3 '18 at 22:27
add a comment |
2
2
2
$begingroup$
I am solving a certain challenge given by my friend.
I want to print the first day of the year if it is not a leap year, while I want both first and second days if it is a leap year.
I want to know if there is an efficient way to rewrite this piece of code:
If[Mod[year,4]==0,DayName/@{{year,1,1},{year,1,2}},{DayName[{year,1,1}]}]
list-manipulation
asked Dec 3 '18 at 20:02
Exp ikxExp ikx
1486
$endgroup$
I am solving a certain challenge given by my friend.
I want to print the first day of the year if it is not a leap year, while I want both first and second days if it is a leap year.
I want to know if there is an efficient way to rewrite this piece of code:
If[Mod[year,4]==0,DayName/@{{year,1,1},{year,1,2}},{DayName[{year,1,1}]}]
list-manipulation
list-manipulation
asked Dec 3 '18 at 20:02
Exp ikxExp ikx
1486
asked Dec 3 '18 at 20:02
Exp ikxExp ikx
1486
asked Dec 3 '18 at 20:02
Exp ikxExp ikx
1486
asked Dec 3 '18 at 20:02
Exp ikxExp ikx
1486
asked Dec 3 '18 at 20:02
Exp ikxExp ikx
1486
1486
1
$begingroup$
As an aside: leap years are not years which are multiples of 4, the definition is slightly more complex
$endgroup$
– Lonidard
Dec 3 '18 at 22:27
add a comment |
1
$begingroup$
As an aside: leap years are not years which are multiples of 4, the definition is slightly more complex
$endgroup$
– Lonidard
Dec 3 '18 at 22:27
1
1
$begingroup$
As an aside: leap years are not years which are multiples of 4, the definition is slightly more complex
$endgroup$
– Lonidard
Dec 3 '18 at 22:27
$begingroup$
As an aside: leap years are not years which are multiples of 4, the definition is slightly more complex
$endgroup$
– Lonidard
Dec 3 '18 at 22:27
add a comment |
2 Answers
2
active
oldest
votes
4
$begingroup$
Here is an alternate solution not using If:
Table[ DayName[ {year, 1, x} ], {x, 1 + Boole[ LeapYearQ[{year} ]]} ]
answered Dec 3 '18 at 21:01
sakrasakra
2,4931428
$endgroup$
add a comment |
2
$begingroup$
LeapYearQ should be more reliable, in particular since special rules apply if the year is divisible by 100 or 400.
f = year [Function] If[
LeapYearQ[{year, 1, 1}],
DayName /@ {{year, 1, 1}, {year, 1, 2}},
{DayName[{year, 1, 1}]}
]
answered Dec 3 '18 at 20:07
Henrik SchumacherHenrik Schumacher
50.7k469145
$endgroup$
$begingroup$
Thanks for that tip. But is there still a better way to write the rest of the code? I mean specifically for DayName part.
$endgroup$
– Exp ikx
Dec 3 '18 at 20:12
$begingroup$
Hm. What does "better" mean? Are you concerned about efficiency? Why? How many years do you want to test this way?
$endgroup$
– Henrik Schumacher
Dec 3 '18 at 20:14
$begingroup$
I'm concerned about efficiency since it's a challenge. Nothing much.
$endgroup$
– Exp ikx
Dec 3 '18 at 20:16
add a comment |
Your Answer
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
4
$begingroup$
Here is an alternate solution not using If:
Table[ DayName[ {year, 1, x} ], {x, 1 + Boole[ LeapYearQ[{year} ]]} ]
answered Dec 3 '18 at 21:01
sakrasakra
2,4931428
$endgroup$
add a comment |
4
$begingroup$
Here is an alternate solution not using If:
Table[ DayName[ {year, 1, x} ], {x, 1 + Boole[ LeapYearQ[{year} ]]} ]
answered Dec 3 '18 at 21:01
sakrasakra
2,4931428
$endgroup$
add a comment |
4
4
4
$begingroup$
Here is an alternate solution not using If:
Table[ DayName[ {year, 1, x} ], {x, 1 + Boole[ LeapYearQ[{year} ]]} ]
answered Dec 3 '18 at 21:01
sakrasakra
2,4931428
$endgroup$
Here is an alternate solution not using If:
Table[ DayName[ {year, 1, x} ], {x, 1 + Boole[ LeapYearQ[{year} ]]} ]
answered Dec 3 '18 at 21:01
sakrasakra
2,4931428
answered Dec 3 '18 at 21:01
sakrasakra
2,4931428
answered Dec 3 '18 at 21:01
sakrasakra
2,4931428
answered Dec 3 '18 at 21:01
sakrasakra
2,4931428
2,4931428
add a comment |
add a comment |
2
$begingroup$
LeapYearQ should be more reliable, in particular since special rules apply if the year is divisible by 100 or 400.
f = year [Function] If[
LeapYearQ[{year, 1, 1}],
DayName /@ {{year, 1, 1}, {year, 1, 2}},
{DayName[{year, 1, 1}]}
]
answered Dec 3 '18 at 20:07
Henrik SchumacherHenrik Schumacher
50.7k469145
$endgroup$
$begingroup$
Thanks for that tip. But is there still a better way to write the rest of the code? I mean specifically for DayName part.
$endgroup$
– Exp ikx
Dec 3 '18 at 20:12
$begingroup$
Hm. What does "better" mean? Are you concerned about efficiency? Why? How many years do you want to test this way?
$endgroup$
– Henrik Schumacher
Dec 3 '18 at 20:14
$begingroup$
I'm concerned about efficiency since it's a challenge. Nothing much.
$endgroup$
– Exp ikx
Dec 3 '18 at 20:16
add a comment |
2
$begingroup$
LeapYearQ should be more reliable, in particular since special rules apply if the year is divisible by 100 or 400.
f = year [Function] If[
LeapYearQ[{year, 1, 1}],
DayName /@ {{year, 1, 1}, {year, 1, 2}},
{DayName[{year, 1, 1}]}
]
answered Dec 3 '18 at 20:07
Henrik SchumacherHenrik Schumacher
50.7k469145
$endgroup$
$begingroup$
Thanks for that tip. But is there still a better way to write the rest of the code? I mean specifically for DayName part.
$endgroup$
– Exp ikx
Dec 3 '18 at 20:12
$begingroup$
Hm. What does "better" mean? Are you concerned about efficiency? Why? How many years do you want to test this way?
$endgroup$
– Henrik Schumacher
Dec 3 '18 at 20:14
$begingroup$
I'm concerned about efficiency since it's a challenge. Nothing much.
$endgroup$
– Exp ikx
Dec 3 '18 at 20:16
add a comment |
2
2
2
$begingroup$
LeapYearQ should be more reliable, in particular since special rules apply if the year is divisible by 100 or 400.
f = year [Function] If[
LeapYearQ[{year, 1, 1}],
DayName /@ {{year, 1, 1}, {year, 1, 2}},
{DayName[{year, 1, 1}]}
]
answered Dec 3 '18 at 20:07
Henrik SchumacherHenrik Schumacher
50.7k469145
$endgroup$
LeapYearQ should be more reliable, in particular since special rules apply if the year is divisible by 100 or 400.
f = year [Function] If[
LeapYearQ[{year, 1, 1}],
DayName /@ {{year, 1, 1}, {year, 1, 2}},
{DayName[{year, 1, 1}]}
]
answered Dec 3 '18 at 20:07
Henrik SchumacherHenrik Schumacher
50.7k469145
answered Dec 3 '18 at 20:07
Henrik SchumacherHenrik Schumacher
50.7k469145
answered Dec 3 '18 at 20:07
Henrik SchumacherHenrik Schumacher
50.7k469145
answered Dec 3 '18 at 20:07
Henrik SchumacherHenrik Schumacher
50.7k469145
50.7k469145
$begingroup$
Thanks for that tip. But is there still a better way to write the rest of the code? I mean specifically for DayName part.
$endgroup$
– Exp ikx
Dec 3 '18 at 20:12
$begingroup$
Hm. What does "better" mean? Are you concerned about efficiency? Why? How many years do you want to test this way?
$endgroup$
– Henrik Schumacher
Dec 3 '18 at 20:14
$begingroup$
I'm concerned about efficiency since it's a challenge. Nothing much.
$endgroup$
– Exp ikx
Dec 3 '18 at 20:16
add a comment |
$begingroup$
Thanks for that tip. But is there still a better way to write the rest of the code? I mean specifically for DayName part.
$endgroup$
– Exp ikx
Dec 3 '18 at 20:12
$begingroup$
Hm. What does "better" mean? Are you concerned about efficiency? Why? How many years do you want to test this way?
$endgroup$
– Henrik Schumacher
Dec 3 '18 at 20:14
$begingroup$
I'm concerned about efficiency since it's a challenge. Nothing much.
$endgroup$
– Exp ikx
Dec 3 '18 at 20:16
$begingroup$
Thanks for that tip. But is there still a better way to write the rest of the code? I mean specifically for DayName part.
$endgroup$
– Exp ikx
Dec 3 '18 at 20:12
$begingroup$
Thanks for that tip. But is there still a better way to write the rest of the code? I mean specifically for DayName part.
$endgroup$
– Exp ikx
Dec 3 '18 at 20:12
$begingroup$
Hm. What does "better" mean? Are you concerned about efficiency? Why? How many years do you want to test this way?
$endgroup$
– Henrik Schumacher
Dec 3 '18 at 20:14
$begingroup$
Hm. What does "better" mean? Are you concerned about efficiency? Why? How many years do you want to test this way?
$endgroup$
– Henrik Schumacher
Dec 3 '18 at 20:14
$begingroup$
I'm concerned about efficiency since it's a challenge. Nothing much.
$endgroup$
– Exp ikx
Dec 3 '18 at 20:16
$begingroup$
I'm concerned about efficiency since it's a challenge. Nothing much.
$endgroup$
– Exp ikx
Dec 3 '18 at 20:16
add a comment |
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1
$begingroup$
As an aside: leap years are not years which are multiples of 4, the definition is slightly more complex
$endgroup$
– Lonidard
Dec 3 '18 at 22:27