Add n days to juliandate
2 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Asatur Khurshudyan
le 23 Jan 2020
Commenté : Asatur Khurshudyan
le 23 Jan 2020
Hello everyone!
I am using
planetEphemeris(juliandate(y, m, d), 'Sun', 'Mars')
to extract the position of Mars relative to Sun at a given date
y, m, d.
Now, I need to add a specific number of days to that date and extract the position of the new date. Apparently,
planetEphemeris(juliandate(y, m, d) + n, 'Sun', 'Mars')
does not work. What do I need to add instead of n to have the position of Mars in, say, 100 days after that date?
Thank you in advance.
0 commentaires
Réponse acceptée
Robert U
le 23 Jan 2020
Hi Asatur Khurshdyan,
According to documentation example juliandate() you may use caldays() to add calendar days to a datetime-date.
planetEphemeris(juliandate(datetime(y,m,d)+caldays(n)), 'Sun', 'Mars')
Kind regards,
Robert
Plus de réponses (1)
Bjorn Gustavsson
le 23 Jan 2020
It seems to work just fine as far as I can see. When I compare:
jd0 = juliandate(2020, 2, 14);
jd0p100 =juliandate(2020, 2, 14) + 100;
jd0p101 =juliandate(2020, 2, 14 + 100);
isequal(jd0p100,jd0p101) % returns true
jd0p101 - jd0 % returns 100
everything seems OK.
What is your problem? What matlab-version are you using?
HTH
0 commentaires
Voir également
Catégories
En savoir plus sur Dates and Time dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!