2,606 reputation
11328
bio website jpl.nasa.gov
location Pasadena, CA
age 47
visits member for 2 years, 6 months
seen 19 hours ago

Dec
4
comment How to Debug Missing[NotAvailable] error for Social Media Data
I also have a full Mathematica license and I get the same error message. I wonder if it has something to do with privacy settings in Facebook.
Dec
4
accepted Inputting abbreviated units
Dec
3
comment Inputting abbreviated units
@Szabolcs: precisely.
Dec
3
comment Inputting abbreviated units
@Szabolcs: I think you're right--that's basically the same question. Unfortunately, I was hoping for a simple "type this" answer, but it doesn't look like that's the case. Should I withdraw this question?
Dec
3
asked Simplifying to different units
Dec
3
asked Inputting abbreviated units
Nov
29
comment Should 0 * 5ft be 0 or 0ft?
@NasserM.Abbasi: the fact that the behavior changed from MMA7 to MMA8 leads me to think that the problem can be fixed.
Nov
29
comment Should 0 * 5ft be 0 or 0ft?
This has come up in the past. I posted the following message on comp.soft-sys.math.mathematica back in 2010: "While testing Mathematica 8 on some heritage code, I found a problem which a colleague traced to a behavioral change in Times[]. Specifically, the documentation for Times[] states that "0 x evaluates to 0, but 0.0 x is left unchanged." This appears to be true in Mathematica 7 but not in Mathematica 8 (at least not under Mac OS X 10.6.4). I have informed Wolfram about this change (bug?)" I don't think I ever received a satisfactory answer (they acknowledged the problem, but no fix).
Nov
19
awarded  Favorite Question
Nov
13
comment How do I create a histogram out of this datastructure: x[i] = value_i?
And to answer your first question, a is a symbol. a={2,3,6} would be a list.
Nov
13
comment How do I create a histogram out of this datastructure: x[i] = value_i?
Do you want an histogram or a bar chart? I suspect you want a bar chart, in which case a={2,3,6}; BarChart[a]
Nov
13
comment problem solving coupled second order differential equations using Dsolve
You should also be careful with FullSimplify. From the documentation: "For fairly small expressions, FullSimplify will often succeed in making some remarkable simplifications. But for larger expressions, it can become unmanageably slow. The reason for this is that to do its job, FullSimplify effectively has to try combining every part of an expression with every other, and for large expressions the number of cases that it has to consider can be astronomically large."
Nov
13
comment problem solving coupled second order differential equations using Dsolve
I can confirm that Mathematica will yield a solution when c1, ..., c6 are exactly 1 (and with the code for z''[t] consistent with the equation at the top of the question), but the result is extremely large and not particularly useful. If you replace c1, ..., c6 with 1., you will quickly get a result which shows the structure of the solution and it ain't pretty (46th order polynomials in t).
Nov
13
comment problem solving coupled second order differential equations using Dsolve
I just noticed another problem: the equation implemented for z''[t] is not the same as the equation listed at the beginning of the question.
Nov
13
comment problem solving coupled second order differential equations using Dsolve
I would think that c6, in particular, would pose a serious problem for DSolve. At a minimum, the OP might want to specify that c6 != 0.
Nov
12
comment problem solving coupled second order differential equations using Dsolve
And FullSimplify instead of FullySimplify.
Nov
8
awarded  Notable Question
Oct
14
awarded  Popular Question
Aug
15
revised RootSum result manipulation/simplification
Corrected a typo in the title.
Aug
15
suggested suggested edit on RootSum result manipulation/simplification