The Kernel is the back-end application thread that does the actual evaluation of all non-graphical expressions. It can be accessed directly through the console but is more commonly working behind the scenes to power the Notebook Interface. Multiple Kernels may be run for parallel computation.
2
votes
0answers
25 views
Behavior of $PreRead in Kernel
I am interested in making a simple accounting style line calculator that allows me to interact with it something like this:
...
2
votes
0answers
99 views
Runaway MathKernel!
I was running a simulation and everything went south (my fault, stupid coding error). So I quit the kernel. Everything was running very slowly, as if it were doing some kind of large calculation. ...
0
votes
0answers
121 views
Mathematica 9.0.1 is clearing variables
I have noticed an errant behavior new in Mathematica 9. I thought at first it was because I was importing a very large text file and Mathematica just couldn't handle it. But now, I have seen the ...
1
vote
0answers
42 views
Opening multiple kernels in command line for batch operation
I have been searching around for a while, and perhaps I'm just using the wrong terminology, but I haven't found a way to do this.
I have a mathematica notebook converted and saved as nobel_test.m, ...
2
votes
2answers
113 views
Keep MathKernel Running In Background - Speed Up Execution Time
Background: I'm running Debian on a remote server with Mathematica installed. I have several dozen small mathematica files that are run in cron jobs at unpredictable intervals and updated based on a ...
0
votes
0answers
61 views
FindMaximum inconsistency
The code below seems to work for n<11. But for n=11, and above, it outputs newa then just outputs "beep" sound.
WhyTheBeep says "The kernel Local has quit ...
0
votes
0answers
53 views
Killing MathKernels running in the background
I have this question: sometimes I need to interrupt my mathematica batch jobs, but how can I get to cleanly kill the MathKernels that are still running on the background? Every time I attempt to kill ...
2
votes
1answer
66 views
Is there a convenient way to localize all variables in a new notebook? [duplicate]
I often digress to test some others’ code when working on my own problems. Usually, I have to check if there are conflict variables. Of course, it is not a wise way. By contrast, all the variables in ...
9
votes
0answers
117 views
Why are there two separate MathKernel processes running when I start up Mathematica 9?
When I start the Mathematica 9 Front End, and check the list of running processes, I see two separate MathKernel processes. If I only start the kernel, without a front end, then there's only one ...
3
votes
1answer
143 views
Remote Mathkernel: SSH encountered a networking error while launching kernel Error code = 1
I have a problem concerning the connection to a remote kernel via ssh on a vpn. I found a working configuration in this question:
Connection to remote kernel can not be established - No specific ...
2
votes
0answers
64 views
Why FrontEnd`KernelExecute doesn't work in KeyEventTranslations.tr?
Which commands can you put in KeyEventTranslations.tr ?
There is an extensive list of FrontEndTokens, but what else can you use? Why something like this doesn't ...
3
votes
1answer
223 views
How is the Mathematica kernel structured internally, and how does evaluation work?
There is so much information available for Java--the internal details of (for example) the JVM memory manager are well-documented, and the performance considerations arising from its interaction with ...
6
votes
0answers
78 views
In .NET/Link, how do I not open multiple kernels?
I'm writing an ASP.NET page intended for multiple users. On the backend we have datatypes that are primarily mathematical, and interact with Mathematica for string-to-double evaluations, among ...
3
votes
1answer
94 views
Connection to remote kernel can not be established - No specific error shown
I was trying to set up a remote kernel using Mathematica 8, a Debian server and a Mac OSX 10.8 client.
First I configured a VPN connection between server and client and went through all the basic ...
5
votes
1answer
119 views
Accessing data on local machine from remote kernel
I have a remote kernel on a server that I would like to use to process some data. The connection works, i.e, I'm able to use the local front end and the remote kernel. However, I cannot figure out how ...
11
votes
3answers
253 views
Suspecting bug in Parallel Framework
I've reduced my actual problem to:
ParallelEvaluate[
Module[{slot=1},
Slot[slot]
]
]
gives error messages that I think shouldn't be there. It seems I can ...
6
votes
1answer
190 views
How to stop the Kernel from running wild?
How to abort or stop this (accidently large defined) SparseArray production?
s = N[SparseArray[Table[{2^i, 4} -> i, {i, 30}]]]
Alt+. or Alt+, seem to give ...
4
votes
3answers
161 views
Can one launch a Player Pro kernel independently of the front end
This question follows on from my earlier one, Seeking strategies to deploy a function securely without a front end.
As it pursues a different track to solve the same problem it seemed distinct enough ...
8
votes
2answers
202 views
Seeking strategies to deploy a function securely without a front end
Background
I have a fuction, which calculates an analytic solution to a multi-dimentional geometry problem.
The function takes a list of real numbers (typically less than a dozen) and outputs a ...
2
votes
1answer
102 views
Export notebook file without launching front-end
I am using a Mathematica script to programmatically generate a Mathematica notebook. The script generates a Notebook expression and then uses ...
6
votes
0answers
69 views
Return partial result when MemoryConstrained aborts NDSolve
I use NDSolve to solve a large set (~400) of coupled ODEs. Sometimes, the memory (~4GB) gets filled up, and my computer becomes impossible to work with, because it ...
5
votes
2answers
58 views
Obtain input expression from history without evaluating
I typed and evaluated an expression, but deleted it from the notebook. For instance, suppose it was
In[1]:= Round@SessionTime[]
Out[1]= 2
I now want to retrieve ...
2
votes
1answer
115 views
MathKernel and MathLM interaction
If one restarts MathLM on a Linux server, will that restart mathkernel as well? In other words, will restarting MathLM affect the current jobs running that use MathKernels?
Thanks.
4
votes
1answer
142 views
Forget past outputs to free memory
While tinkering with a notebook that loads a large chunk of data in memory, I noticed that if I run it multiple times, the past chunks reside in memory. I understand that the reason (or one of) for ...
10
votes
2answers
167 views
How can I access a variable in one evaluator from another evaluator?
I have two notebooks, each with a different kernel. Is there a way to grab the value of a variable in KernelA from KernelB?
1
vote
0answers
67 views
Context “Unique to This Notebook” makes variables black even if they're not defined?
I'm trying to use this technique to keep variables separated between different notebooks. It seems to be working fine, except that variables turn black as soon as they are evaluated — any ideas why ...
3
votes
1answer
47 views
How can I kill one evaluator from another?
I have a kernel named A in one notebook and other notebook with kernel B, how can I kill B from A?
5
votes
1answer
179 views
Using “Raw MathLink Connections” to create a “Kernel Object”
Mathematica 8.0.0:
I am stuck trying to get a Mathematica Mathlink connection from my Windows computer working that should connects to Linux over network (or vice versa) and then launches a Kernel on ...
4
votes
1answer
504 views
Improving NDSolve speed for heavily stiff problems
Having looked around the intergoogles and Mathematica.SE, I thought I'd pose a question with a minimum working example.
Here is the situation I am trying to improve:
I am solving a 4th order non ...
3
votes
2answers
294 views
Is there a way to get user input when running a script on a Linux terminal?
I have access to a node of a Linux cluster, on which Mathematica is installed. However, I do not have access to a Linux GUI.
Typically I write and test Mathematica scripts on my Windows personal ...
6
votes
1answer
87 views
Importing parts of Packages
Some programming languages offer the possibility of importing a single function from a library, as in
from x import y
I'm looking to import only one function ...
8
votes
2answers
272 views
Evaluator option for Mathematica Scripts
I have mathematica with many additional kernels besides Local ( e.g., core1, core2, core3, core4 ... ) added through Kernel Configuration Options. I have been running multiple copies of a simulation ...
7
votes
2answers
351 views
Automatically load packages at startup
I'm a physics student and I try to simplify my day with Mathematica. Every time I use Mathematica I need Div[], Grad[], ...
3
votes
2answers
121 views
Reasoning about Degree of Polynomial
Apologies if this is outside of the realm of Mathematica -- I'm still trying to figure out the limits of how expressive Mathematica is (and how much of my work can be automated).
Suppose I define the ...
3
votes
1answer
363 views
Is there a system Reset? [duplicate]
Possible Duplicate:
How do I clear all user defined symbols?
The normal way I reset the Mathematica kernel to its initial state is through the notebook interface: ...
11
votes
1answer
314 views
Space-efficient null space of sparse array
I have a roughly 100,000 × 3,000 matrix (as a SparseArray) that I'd like to find the kernel (null space) of.
It has about 500,000 nonzero entries, all -1 or 1.
...
7
votes
1answer
412 views
Creating and editing new stylesheets
I'm trying to create a stylesheet, but the process has become painful. I'm sure that this has to do something with resetting something in Mathematica everytime I make changes to the stylesheet. To ...
20
votes
4answers
644 views
Saving data inside a notebook so that I don't have to run it again?
Piggybacking on this, I am somehow not fully convinced that I can't save data generated by a calculation in a mathematica file so that when I re-launch said file, I wouldn't have to run my ...
0
votes
0answers
81 views
Running out of memory more gracefully [duplicate]
Possible Duplicate:
Aborting evaluation when the memory exceeds a certain limit
My script ran into the following error, with no further comments from the kernel.
No more memory ...
5
votes
3answers
380 views
Generating figures over remote connection (using terminal)
Recently I've been making movies by having Mathematica create figures and then I combine all of them together using ffmpeg. The problem now is that my macbook is ...
18
votes
2answers
714 views
Unsaved notebook is crashing: is there any way I can save the state of the MathKernel before I kill it?
So I'm in the middle of generating some plots and all of the sudden the frontend goes dead and I haven't saved my work. I'm using Mathematica 8 in MacOS X.
The MathKernel process is still running and ...
7
votes
2answers
207 views
Does Mathematica on Mac OS use virtualization for certain functions?
I'm evaluating this code in Mathematica 8.0.0 on Mac OS X 10.6.8:
...
22
votes
4answers
738 views
Aborting evaluation when the memory exceeds a certain limit
Sometimes when generating a lot of data the memory usage shoots beyond its physical realm and my laptop freezes. There is no way to stop Mathematica when this happens. Task manager (or its equivalent ...
8
votes
1answer
273 views
Kernel Management
I would like to run a computation in one NoteBook that will take 2 hours.
Could I assign this Notebook a specific Kernel so I can run computation in other Notebooks ?
15
votes
5answers
3k views
How do I clear all user defined symbols?
Is there some way to do this other than going to Evaluation -> Quit kernel and firing a new one up?
