Wolfram Mathematica

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7:22 AM

Although this question is poorly posed, it is interesting one nonetheless:
http://mathematica.stackexchange.com/questions/127384/vector-equation

Mathematica seems to do a poor job solving non-linear vector equations...

Entering the three equations componentwise causes Solve to hang for me.

Anyone have any ideas on this?

3 hours later…

sky-light

9:56 AM

Dear friends,
I have the following code; I appreciate if someone helps me what is wrong with it?

KK = 3;
limm = 4;
yall = {};
For[j = 0, j <= limm, j = j + 1, pt = j;
px = 2^pt;
outloop = 0;
For[i = 1, i <= KK, i = i + 1, ntest = i;
Which[ntest == 1,
y1 = px + 1,
ntest == 2,
y1 = px + 2,
ntest == 3,
y1 = px + 3]
outloop = outloop + y1;
]
y2 = N[(outloop)];
yall = Append[yall, outloop];
]

sky-light

10:22 AM

Found the mistake, Thanks

2 hours later…

Szabolcs

12:23 PM

@Kuba and everyone else: please take a look at the Update part here: mathematica.stackexchange.com/q/127422/12 Nasty bug in Compile??

Kuba

@Szabolcs Does look like one but I don't Compile so much.

2 hours later…

kirma

2:29 PM

Hrmm. WRI knows that 11.0.1.0 is available and I "could" upgrade to it, but my personal service should provide free upgrades... nowhere to be seen.

Even more disturbingly, the upgrade page would happily sell me the service again, although it has like ten months until it expires. (This is after entering license number for upgrade query.)

Your service plan includes the following benefits, and more:
* Upgrades to new versions of Mathematica

What part of this I misunderstand?

Kuba

3:04 PM

It would be nice to have the same precedence of patterns for f and g cases:

ClearAll[f, g];

f[KeyValuePattern["A" -> x_]] := x
f[KeyValuePattern["A" -> 1]] := special1

g[x_] := x;
g[1] := special1

f@<|"A" -> 1|>
f@<|"A" -> 2|>
g[1]
g[2]

> 1
> 2
> special1
> 2

Michael Hale

3:40 PM

@kirma The upgrade button worked for all three of my versions. For the standard and home editions the upgrade button stays available even after upgrading. For home annual it went away after clicking upgrade as expected.

kirma

@MichaelHale Hmmh. Nothing on the reminder column for me yet (but it's Home edition).

I've just paid for the upgrade before right away, but I suppose having a support contract makes level of service in this regard... worse!

I have certain troubles understanding that new kind of logic involving availability of upgrades depending on strange, earth radiation and phase-of-the-moon type details.

Michael Hale

@kirma It's not clear to me either. I feel like in the past I saw an upgrade on home but not home annual, which surprised me. Then this time I saw an upgrade on all of them, which also surprised me. I think maybe they updated database schema for storing this info and some corruptions creeped in.

kirma

Maybe SW enjoys surprising people in strange ways.

But I must say it's highly questionable that if I check for upgrades through the most obvious path on the wolfram.com front page, I get offered to buy the contract I already have instead of saying I already have it.

Michael Hale

@kirma It doesn't surprise me at all that you're always allowed to buy more, but I would call them about why the upgrade button isn't appearing on your user page. I called them last year about transferring the copy I bought for my dad to his account and they were very nice.

kirma

3:55 PM

@MichaelHale Usually they have been quite responsive to any sort of queries, especially regarding licenses... but that sounds like an idiotic approach for something that's supposed to be automatically available.

Michael Hale

@kirma No I don't think you should normally have to call them. But I think maybe something is messed up with your account. That's why I'd call them this time.

kirma

@MichaelHale I think they have had traditionally an oddball strategy of rolling out releases to customers over some period of time, instead of all at once. Maybe I'm hit by it now - when I'm paying for "free" upgrades!

kirma

4:23 PM

One of my licenses is for 4.1.1, haven't upgraded the student license since (although technically I'm still a student... I just don't care of the hassle).

JasonB

@kirma - you've been a student since version 4.1.1? They really drag out the PhD process these days.....

kirma

@JasonB I've been a student since 2.2 days. I just happen to have perpetual study rights at the university, but it sort of might be lifespan is the limiting factor in getting those degrees. ;)

2.2 was the version they used to introduce me to Mma as a freshman.

kirma

4:42 PM

A degree might be nice, but frankly, on fields I've gained expertise there is maybe one expert of the same level in million people - and the rest of them in the country are sitting in the same office. At that point, getting teached on the subject becomes pretty questionable. In order to be a generalist studies might be welcome, though.