@Nasser @rm-rf Oh man... OK, I fixed it for the team.

@halirutan why did you fixed it so fast? you took all the fun away :)

@halirutan Happy 30K! I just noticed.

@Nasser Because I voted up. Then I saw the mistake voted down again. Then I thought this is unfair, fixed it and voted up again ;-)

@MichaelE2 Thanks. If the quality of the questions drops further I think I'll stay at 30.

@halirutan the funny thing is that me and you said so in the comments, that it is the wrong command. Yet the answer used the same original wrong command. I guess they did not read the comments.

@Nasser Yes, that's why I voted up without checking ;-) I thought he must have seen it.

@halirutan if you have a sec, if you can play with my demo pls. You have lots of image experience, so your feedback is good. I have the cdf here: 12000.org/tmp/080613 I want to send it to WRI demos. simple one.

when you have time...

@Nasser Sorry, I switched to windows. One last round of battlefield with my wife before we go to sleep.

oh no problem, any time is ok. Still testing it myself need few more days. thanks :)

Is anyone here decent at diagnosing internal mathematica errors? So a little spelunking?

Well I keep getting "First::first: {} has a length of zero and no first element. >>"

for the following code pastebin.com/4525MA6k

Cases is returning the message. The funny thing is that Cases returns the correct result, each just also gives an error.

I am currently just doing

Quiet[
 Cases[x,
  Cell[___, CellTags -> "MyGraphic", ___]
  , Infinity],
 First::first]

hi guys

Unless this is broken it needs more than two votes IMHO:

@Sosi Hello. I'm just passing through. If you're still here do you need something?

@Mr.Wizard Hi! Nope, all good! ;)

@Liam What on Earth is all that?

@Kuba Yes, I noticed, but I think it's the best action given the situation. He can (register then) edit the question if he feels the need.

@Mr.Wizard There are other reasons to close then. The effect is the same but I looks silly now.

hehehe congrats @Mr.Wizard!

@Sosi Thanks!

@Mr.Wizard I'm a Legend in my own mind!

@mr.wizard are you there?

Hi @Sjoerd

I'd appreciate some timings in a later version for comparison.

Just got back from vacation, and about to got to bed so I've to be quick

timings?

I was talking about angles and positions

Let me check

@SjoerdC.deVries In that case welcome back, never mind, and rest well! :-)

just a quick one about the projection ok?

@SjoerdC.deVries Sure.

Point is that the second eye has a rotated view of the scene but it is also translated by about 6.5 cm with respect to the first eye

this means that depending on the geometry of the scene some relative sizes may be bigger or smaller

@SjoerdC.deVries If the scene is in the center of the view wouldn't the distances be equivalent; that is the points along a circle also form an isosceles triangle?

No

<---- brain fail

I need a picture. Maybe when you wake up. :-)

The left side would appear bigger in the left eye and the right side in the right eye (being closer to the respective eyes)

@SjoerdC.deVries Ah, I think I get it now. I wonder how large an effect that has?

This effect is important for objects that are nearby. In the order of a couple of interpupilary distances.

It causes the so-called vertical disparities, which are smaller than the more familiar horizontal disparities

It is thought that they may be important in judging absolute distances and so.

It seems I have some reading to do; I don't think I've ever heard of that. <:-/

Hi @Nasser

@MrWizard hi

ANyway, good to see you back. But I've got to go. Night!

Good night @Sjoerd

@Mr.Wizard guess what, I remembered an answer of yours where you used Levels, and I used it for an answer today. It is nice function, Never knew about it.

here mathematica.stackexchange.com/questions/30038/…

@Nasser Here's a shorter expression that I believe should be equivalent:

Variables @ Cases[expr, _?AtomQ, -1]

Latex with tikz is really amazing. One can make really amazing darwings with. Not as easy to use as M, but it is nice since it is integrated with Latex and the whole document just comes out nice.

@Mr.Wizard nice. that is even shorter. You should post it as answer.

You did not even use Level !

One confusing thing in M, is that there are 10 ways to do the same thing.

@Nasser Actually I'm still not thinking well; atomic is just level {1} so:

Variables @ Level[expr, {-1}]

:-)

But it worked with -1 and {-1} just the same.

any way. Nice answer.

I am happy to just find one answer that works. Do not bother to look for me :)

I voted for your answer and posted my version of it. 1 and {1} are not the same; the latter is needed to keep things like Sin[x] out of the results.

I see. good to know. I am not really good in expression manipulations, but I am learning now, becuase I am taking a course which has lots of symbolic math in it, and I know I'll be using M alot in it. So I need to get better at these things fast...

@Nasser I don't pretend to be the best at such things but I think I'm pretty good; I'll be glad to try to help any time I'm around.

Welcome @Mike

hello all

See you all later.

Manipulate is really cool. It allows one to quickly test things and try different settings on a problem. I wish CDF's are more popular though... I do not think WRI is making lots of effort to make CDF's available for use by everyone...

The closest things to making a CDF is Java applets, and those are dead, and Java does not even have symbolic and math in it like with Mathematica.