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Apr
1
revised Efficiently strip off coefficients in front of variables?
deleted 22 characters in body
Apr
1
revised Efficiently strip off coefficients in front of variables?
added 3 characters in body
Apr
1
answered Efficiently strip off coefficients in front of variables?
Apr
1
revised Matrix indexed by one number
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Apr
1
revised Matrix indexed by one number
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Apr
1
answered Matrix indexed by one number
Apr
1
revised Importing a VCF file with quoted-printable encoding
deleted 23 characters in body
Apr
1
revised Importing a VCF file with quoted-printable encoding
added 20 characters in body
Apr
1
revised Importing a VCF file with quoted-printable encoding
added 100 characters in body
Apr
1
answered Importing a VCF file with quoted-printable encoding
Apr
1
comment Importing a VCF file with quoted-printable encoding
you should make that an answer. (The CharacterEncoding option throws a warning for me by the way, but it works. possible version issue)
Apr
1
revised Different interpretation of system of equations
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Apr
1
revised Different interpretation of system of equations
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Apr
1
answered Different interpretation of system of equations
Apr
1
comment Importing a VCF file with quoted-printable encoding
What you have are two 3-byte utf-8 characters. Looking here: ansell-uebersetzungen.com/gbuni.html you can look up the same characters as in your screen dump.
Apr
1
comment Different interpretation of system of equations
is it guaranteed 0<r1<a^2 ? Even if so Reduce might not recognise that from the root expression.
Mar
31
comment Rotate from 0<=X<infinity
@PlatoManiac I think the plot should actually be of {Exp[-x],x]}. Note the question asks for revolution about the x axis and RevolutionPlot rotates about z so you need to swap x->z and y->x as you read the docs.
Mar
31
comment How I can get faster code for computing a fractional integral?
your attempt to decompose integral of sums is not as general as needed. For example u1[x] is a sum of two terms but 8 u1[x] has head Times. that said I'm puzzled why thats needed at all, but notice INT[-\[Alpha], u1[x], x, Assumptions...] returns almost immediately while INT[-\[Alpha], 8 u1[x], x, Assumptions...] does not.
Mar
31
comment NDSolve and matrix formulation do not produce the same result. Why and which is more precise?
i guess noise is not the right word. Your matrix solution shows a high frequency component not present in the direct solution. I'm guessing some error - compare your matrix with my h66 i think they should be the same although I didn't check that part of your code.
Mar
31
revised NDSolve and matrix formulation do not produce the same result. Why and which is more precise?
added 35 characters in body