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Oct
17
revised Newton-Raphson Method and the Van der Waal Equation Coding question
added 293 characters in body
Oct
17
comment Newton-Raphson Method and the Van der Waal Equation Coding question
Starting conditions were found by trial and error: minimise with a starting value function, plot the results, make up a new function that approximates the good bits of the plot, repeat. See the edit for a better way to do it.
Oct
15
comment Customizing & finding intersection points in polar plot
That's why I'd like to know exactly what the theorem is. As far as I can tell, the curve does not go through equally spaced points at those angles (aside from my ability to count to eight).
Oct
14
answered Customizing & finding intersection points in polar plot
Oct
14
comment Customizing & finding intersection points in polar plot
That's not a golden spiral. This might be PolarPlot[GoldenRatio^(2 n/\[Pi]), {n, 0, 2 \[Pi]}]. Can you quote or link to the theorem?
Oct
10
comment How can I speed up my numerical integration?
And should x0 be -50 or 10^-50?
Oct
9
comment How can I speed up my numerical integration?
What's x2? Also, your function f doesn't seem to use xe?
Oct
9
answered Replace elements in list not matching elements of another list at the same position
Oct
9
revised Newton-Raphson Method and the Van der Waal Equation Coding question
added 347 characters in body
Oct
9
answered Newton-Raphson Method and the Van der Waal Equation Coding question
Sep
12
awarded  Nice Question
Sep
5
comment Text as plot axes values
What's the deal with Europium?
Aug
19
awarded  Nice Answer
Jul
17
comment Picking numbers within a list with an interval of 60
You might need to explain a bit more clearly. For example, what's wrong with {5, 14} as one of your sublists? Posting your existing code always helps too. Split and Gather are useful functions for this type of problem.
Jul
16
comment Problem with Looping/Recurrence - Null Results
"Unless an explicit Return is used, the value returned by Do is Null."... and you are printing that Null. Just evaluate list after the loop and see what it is.
Jun
26
comment Why doesn't FindRoot work correctly?
It's finding a root, which is all it is asked to do. Starting a bit closer might give the root that you want. Try changing your .5 to x.1.
Jun
20
comment Efficient Generation of Subgraphs (or, unfriend a friend a day)
With 10 people, they each have a choice of 9 unfriendings, giving $9^{10}$ possibilities. The next day there is probably still 10 people with 8 choices, so the total possibilities so far is $9^{10} 8^{10}$. This gets very big, very fast. I don't think you are going to brute force it.
Jun
18
comment StringReplace except some pattern
@HyperGroups Indeed. Have edited to fix.
Jun
18
revised StringReplace except some pattern
Shortests no Longest
Jun
17
answered StringReplace except some pattern