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2016-12-15 14:17:05 +0100 commented question How to convert worksheet to pdf file?

It's Sage math cloud worksheet.

2016-12-15 10:32:01 +0100 asked a question How to convert worksheet to pdf file?

I'm trying to convert a worksheet to pdf file. I printed the worksheet in a specified file as a pdf file,but the place of headers changed a little,and some addresses added to to the top of the pages, how can I fix this? Thank you in advance.

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2016-12-03 19:32:40 +0100 commented answer How can I count the number of cycles of special length in a graph in sage?

Thank you so much,I got it.

2016-12-02 20:10:26 +0100 commented question How can I count the number of cycles of special length in a graph in sage?

Yes ,That's what I'm trying to do,but what is 8 that it should be divided by?

2016-12-01 09:07:54 +0100 asked a question How can I count the number of cycles of special length in a graph in sage?

I have tried the G.subgraph_search_count(graphs.CycleGraph(4))but it doesn't lead to the correct answer, any help would be appreciated.

2016-11-18 17:49:56 +0100 commented answer How to solve non_homogenous recurrence in sage using rsolve functions?

Thank you .I also tried this ,but the answer is not the thing that I've calculated with the characteristic function method!

2016-11-18 17:42:39 +0100 commented question How to solve non_homogenous recurrence in sage using rsolve functions?

Here is the code:from sympy import Function, rsolve,Poly from sympy.abc import n b=Function('b') a=Function('a') f=(b(n+2))^2-5*(b(n+1))^2+6*(b(n))^2-7*n inits={b(0):1,b(1):1} b(n)=rsolve(f,b(n),inits) b(n)

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2016-11-18 17:30:45 +0100 commented question How to solve non_homogenous recurrence in sage using rsolve functions?

@slelievre Yes ,you're right sorry.

2016-11-18 11:59:58 +0100 asked a question How to solve non_homogenous recurrence in sage using rsolve functions?

a(n+1)^2-5a(n+1)^2+6a(n)^2=7n a0=a1=1 I've used rsolve for this recurrence relation but I got the error min() arg is an empty sequence any help would be appreciated.from sympy import Function, rsolve,Poly from sympy.abc import n b=Function('b') a=Function('a') f=(b(n+2))^2-5*(b(n+1))^2+6*(b(n))^2-7*n inits={b(0):1,b(1):1} b(n)=rsolve(f,b(n),inits) b(n) the error is:ValueError: min() arg is an empty sequence