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27m
comment How can I tell if two lines will cross using vectors
Not sure what you are asking exactly.
28m
accepted Slow convergence simulating log-normal sample from the normal
28m
comment Slow convergence simulating log-normal sample from the normal
You are right, it is all about a long tail. I tried it with billion entries, and mean looks ok to 5 digits, but st. dev. is still all over the place. Increasing the mean to 0.05 already matched the st.dev. to 3 digits at 1 mln trials, and doing down to 0.005 with 1 billion trials is not enough... I wonder what the relationship there would be...
2h
revised Algebraic Problem regarding Cubes.
edited tags
2h
comment Algebra 2 help!
I don't think you really taught the OP anything by an answer like that. It would perhaps be better to give him a general hint, or a first step and let the OP figure it out from there.
2h
answered Find the maximum of a function with 4 parameters
2h
comment Distribution of test scores calculate cutoff given mean and standard deviation
Hi, welcome to Math.SE! We don't like to do your homework for you :), so could you please update your question with your thoughts/attempts to do the problem and we will be happy to guide you further.
2h
comment Interest Question
I got 70902.58 for the same calculation
2h
revised Interest Question
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2h
revised Interest Question
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2h
comment Interest Question
Also, what is interest "p.a"?
2h
comment Interest Question
Hi, welcome to Math.SE! We don't like to do your homework for you :), so could you please update your question with your thoughts/attempts to do the problem and we will be happy to guide you further
2h
comment Plotting Distance Constrained Points on a Plane
may be an interesting post on StackOverflow, someone with lots of experience in embedding algorithms may be able to contribute
2h
reviewed Leave Open How many words can be formed using all the letters of “DAUGHTER” so that vowels always come together?
16h
comment Shortest Path Length as mathematical function/expression
the only thing i can think about is $X^n_{ij}$ is the number of $i \to j$ paths of length exactly $n$
16h
revised Shortest Path Length as mathematical function/expression
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17h
comment Finding the horizontal and vertical tangents of a parametric equation.
@Alex updated solution with another approach for you
17h
revised Finding the horizontal and vertical tangents of a parametric equation.
added 433 characters in body
17h
comment Finding the horizontal and vertical tangents of a parametric equation.
@Alex horizontal tangents have $y'=0$ so you end up with $x=0$ or $x^2+y^2=1$
19h
answered Finding the horizontal and vertical tangents of a parametric equation.