Reputation
53,957
Next tag badge:
100/100 score
20/20 answers
Badges
2 83 213
Impact
~712k people reached

Aug
16
comment How to show multiple images with a for loop
Or ListAnimate or FlipView ...
Aug
16
comment What is the best way to produce a symmetric semi-definite matrix using as few variables as possible?
Possibly related: Constructing a symbolic Hermitian matrix. But usually positive semi-definiteness means that the eigenvalues have to be non-negative. Is that what you're actually after? Does the parametrization have to produce just some such matrices or all of them?
Aug
16
comment Plotting Error Bars on a Log Scale
This solution may no longer work correctly in version 8 and above, as suggested in this question
Aug
15
comment How to properly project a Graphics object consisting of line primitives
If you want to do a lot of 3D manipulations with the contour plot and the line, I would definitely suggest combining them together into a single texture on a 3D polygon first. The graphics will become much more responsive.
Aug
15
comment Image Tooltip exported to HTML
Related question: How to work around incorrect tooltips in plots exported to HTML
Aug
15
comment Step-by-step definite integration
OK, I added a modified version that should be able to make the right stylistic decisions.
Aug
15
comment Step-by-step definite integration
Ah yes, good idea. I'll think about it... Length may not be good - you just want to bracket operations with low precedence (like + or -), right?
Aug
15
comment How can this type of optical illusion be created in Mathematica?
I didn't downvote and instead upvoted now... since apparently someone had fun wit this after all. But I also agree with @MichaelE2.
Aug
14
comment How can this type of optical illusion be created in Mathematica?
As usual: what have you tried? What Mathematica related difficulty are you having in producing this image?
Aug
14
comment Mathematica 8: ContourPlot finding out max and min function values
@Mr.Wizard I agree, now that the intention of the question has been fully clarified.
Aug
14
comment Mathematica 8: ContourPlot finding out max and min function values
I don't think so. He wants the max and min that go into the color bar. The contours are the lines that divide the color bar, not including the extrema.
Aug
14
comment Mathematica 8: ContourPlot finding out max and min function values
@Shrihari Yes, this is because reportColorRange has to look over Mathematica's shoulder while it's calculating the plot. So you have to always wrap the actual plot command by reportColorRange. When the plot is already done, it's too late to find out all the function values that have actually been encountered (to get the accurate max and min) - because only the function values at which contours are drawn will actually be kept, and that's not the correct min-max range.
Aug
14
comment Mathematica 8: ContourPlot finding out max and min function values
You're not finding the max and min values of the actually plotted function, just the extremal values of the drawn contours. This is not the same thing.
Aug
14
comment Mathematica 8: ContourPlot finding out max and min function values
The range of values you detect from the drawn contours is not the correct range for the legend. See my answer.
Aug
13
comment How do I use Mathematica as a vector drawing program?
I think Mathematica is a great tool for programmatic, algorithmic drawing. Manual drawing, not so much (too sluggish). This question is about something in-between the two extremes because we're asked to work with given shapes only. That makes it OK as a topic, I guess. It's just a little too open-ended for me... How about changing the title to omit "vector drawing program" and be more specific? E.g.,"Shape manipulation"...
Aug
13
comment eigenvector bug?
Pretty shocking, this one. Are you going to report it to Wolfram? http://www.wolfram.com/support/contact/email/?topic=Feedback
Aug
11
comment Axis/Angle from rotation matrix
No, unfortunately there isn't a built-in function for this.
Aug
11
comment Determinant of a large matrix and solution of a linear equation
I guess this isn't a duplicate, given the linearity in x which makes this problem especially simple.
Aug
10
comment Determinant of a large matrix and solution of a linear equation
I didn't even notice that "linear equation" in this case meant just linear in x. So obviously this is the blindingly simple answer.
Aug
10
comment Determinant of a large matrix and solution of a linear equation
Possible duplicate of Find Determinant/or Row Reduce parameter dependent matrix, or of How to get the determinant and inverse of a large sparse symmetric matrix?