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50m
comment Why does my contour plot have missing blotches?
What happens if you add PlotRange -> All?
54m
revised An recurrence equation that can be solved in version 7 but not in version 8
deleted 7 characters in body; edited tags
1h
comment Generating a matrix using sublists A and B n times
@Mr. Wizard, yes, it does now. :)
6h
comment Don't understand about how to solve the first equation with Gauss Elimination
Didn't you notice where your other question was moved?
7h
comment How to make a Nebulabrot?
"won't scale" - you've tried replacing the 275 in Paul's code with a higher number? (It will take longer to render, of course.)
7h
comment How to make a Nebulabrot?
"this doesn't really do the trick" - SFAICT, only the coloring is different. What do you think is wrong?
7h
comment What am I missing in this highly oscillatory integral?
Hmm, in that case, apart from Levin's papers, you might consider looking for papers by Arieh Iserles on oscillatory integration. If all else fails, you can always fall back on Longman's method.
8h
comment Inputting values into the variables without having to input the matrix all over again
The built-in function does partial pivoting. Granted, this is a must in applications, but the OP wants to do the usual Gaussian elimination sans pivoting, and there is no facility to switch pivoting off.
8h
comment Adding two conditions in the color function for a contour plot
In any case, that now looks like a conversion to HSB is needed.
8h
comment Adding two conditions in the color function for a contour plot
@LLlAMnYP, prolly multiple account follies again. We can link the fellow to the account merging page if s/he shows up again.
8h
revised Inputting values into the variables without having to input the matrix all over again
edited tags
8h
comment Inputting values into the variables without having to input the matrix all over again
Also, you should be using L.U instead; Dot[] is the function intended for multiplying matrices in the usual way.
8h
comment Inputting values into the variables without having to input the matrix all over again
{L, U} /. First @ Solve[(* stuff *)]?
8h
revised How to segment letters and text blobs?
edited tags
8h
comment Adding two conditions in the color function for a contour plot
Much as I don't like being made to read minds by askers, I wonder if what was desired was what the result of ColorConvert[color, GrayLevel] would be if it were only applied to a specific region…
8h
comment Adding two conditions in the color function for a contour plot
"fades to grayscale" is sorta kinda vague; what sorts of gray are you expecting to come from your colors?
9h
comment What can I use as an equivalent of python zip in mathematica inside of Sum[]?
@chia, f @ x is just the same as f[x]; a prefix form of function application to a single argument.
9h
comment What am I missing in this highly oscillatory integral?
@Daniel, that picture looks like a fun bunch. :)
9h
comment What can I use as an equivalent of python zip in mathematica inside of Sum[]?
Consider Total[y1/(4*x1) + (1 - y1)/(4*x2) - weights y1/(widths + x1) - (1 - y1)/(widths + x2)] to exploit listability.
9h
comment What can I use as an equivalent of python zip in mathematica inside of Sum[]?
Also, if one wants the full generality of zip(), Flatten[] with a properly set second argument might be more appropriate.