Jerry Caveney's profile - activity

Forgot about that. Done. Thank you.

I have a list of integers. I want to divide (n+1) by n. I can do this with no problem, but I can't get the resulting fractions in reduced form. My list has 50 items, but I'll only do a list of 5 here to avoid spamming.

sage: a = [6198089008491993412800, 3099044504245996706400, 2066029669497331137600, 2324283378184497529800, 1239617801698398682560]

sage: c = [(n + 1)/n for n in a]

sage: print (c)

[6198089008491993412801/6198089008491993412800, 3099044504245996706401/3099044504245996706400, 2066029669497331137601/2066029669497331137600, 2324283378184497529801/2324283378184497529800, 1239617801698398682561/1239617801698398682560]

I don't know why Sage doesn't automatically reduce these fractions, but since it doesn't, I've tried multiplying by 1 and using reduce() and simplify(), and have searched everywhere I could think of for an answer, but nothing works. I apologize in advance for asking such a rudimentary question.

Corrected, and once more thanks. If you see anything else that should be fixed, please let me know. I've learned a lot f

Thanks also for the Sage method using zip. Just noticed now that you had added that to your answer.

Thanks also for the Sage method using zip. Just noticed now that you had added that to your answer.

Note: I added this answer before I saw that FrédéricC had provided an answer using Sage, which is perfect. I have not de

How to reduce a list of fractions I have a list of integers. I want to divide (n+1) by n. I can do this with no problem,

I've tried to edit all my mistakes (though I'm not sure, should Sage output be treated as code? I'm guessing no). If mis

I've tried to edit all my mistakes (though I'm not sure, should Sage output be treated as code? I'm guessing no). If mis

Note: I added this answer before I saw that FrédéricC had provided an answer using Sage, which is perfect. I have not de

Note: I added this answer before I saw that FrédéricC had provided an answer using Sage, which is perfect. I have not de

How to reduce a list of fractions I have a list of integers. I want to divide (n+1) by n. I can do this with no problem,

Note: I added this answer before I saw that FrédéricC had provided an answer using Sage, which is perfect. I have not de

Thank you! I didn't pay attention to the output of Sage. I'm trying to divide each term in the list by the term before i

Oops! thank you.

Note: I added this answer before I saw that FrédéricC had provided an answer using SM, which is perfect. I have not dele

Thank you! (I added my answer before I saw that you had answered.)

The answer is to use Python: import fractions a = [insert list, deleting last item] b = [insert list deleting first

Thank you, FrédéricC. I went to Python, which I have been studying, slowly, and (of course) with some help from the Stac

Thank you! I didn't pay attention to the output of SM. I'm trying to divide each term in the list by the term before it,

Thank you! I didn't pay attention to the output of SM. I'm trying to divide each term in the list by the term before it,

How to reduce a list of fractions I have a list of integers. I want to divide (n+1) by n. I can do this with no problem,

thank you.

Thank you! Do you know of a site where I can learn why this works, and how similar problems have to be programmed to wor

This is so basic I'm embarrassed to even ask the question, but I've tried all the possibilities I can think of, and searched two SM guides (SM Tutorial and SM for Undergrads), and I can't find out how to do this. I want to multiply a list of rational numbers (fractions) by an integer. I've tried with lists and sets (although sets wouldn't really work, because the list of fractions contains repetitions), and I've tried with the single integer as simply a number and as a list. But I always get an error message, saying "unsupported operand type(s)" or something similar. Here is an example of what I'm trying to do:

a = [1, 1/2, 1/3, 3/8, 1/5, 1/3, 3/14, 1/4, 1/6, 1/4,]

b = 840

print (a ^ b)

Help for a clueless newbie would be greatly appreciated. (Also, if anyone can recommend a tutorial or guide that will explain how to do these sorts of things in SM, that would be even better!)

How to multiply a list by an integer? This is so basic I'm embarrassed to even ask the question, but I've tried all the

How to multiply a list by an integer? This is so basic I'm embarrassed to even ask the question, but I've tried all the

With essential help from slelievre, I managed to achieve coding to return the fractional 'density' (if that is the right term) of primes between n^2 and (n+1)^2:

for n in range(1, 51):
    a = n^2 + 1
    b = (n + 1)^2 + 1
    c = 2*n
    nprimes = sum(1 for p in prime_range(a, b))
    d = f"{nprimes}/{c}"
    print(d)

Now I want to extract just the denominators of this sequence so that I can find the LCM of all those denominators and then convert all the fractions to have the same LCM denominator. (I cannot just use 2n to find the LCM because the fractions need to be reduced.) I found the command x.denominator(), but it seems to work for only a single fraction of integers. At least that's what I understand the error message to mean when I try d.denominator() or print(d.denominator()), the error message reading "AttributeError: 'str' object has no attribute 'denominator'".

Any help in showing me how to do this would be greatly appreciated.

Thank you, everything works beautifully now. I'm learning Python syntax mostly by trial and error. I've worked on the SM

Thank you so much. This certainly looks like what I need, but I can't get it to work. I apologize for my ignorance. I fi

I have now worked out the LCM by hand (but I still want to be able to do it through SageMath), and the value is a bit ov

How to return only the denominators of a sequence of fractions created by a formula With essential help from slelievre,