Tagged Questions

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.

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3
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1answer
177 views

How to correctly disconnect from the kernel?

I'm connecting to and disconnecting from the kernel but I'm doing something wrong. I crash the text formatting in the terminal and got some warnings. There are some instructions to connecting to the ...
7
votes
2answers
291 views

Why LibraryLink function crashes at a second time?

I'm trying link one of Lapack's function to Mathematica through LibraryLink, and the Library function works great at the first execution but crashes at the second time. Here is the code (modified ...
15
votes
2answers
300 views

MathKernel doesn't return all Messages

In Mathematica I run this command: Plot[Sin[x], {x, 1, 15}, GridLines -> error] It generates a Plot with this error message: A GridLines specification ...
0
votes
0answers
180 views

Licence and number of controlling kernels

I'm trying to understand the differences between controlling kernels and subkernels. I created 3 local kernels (kernel configuration options > add), each using a maximum of 8 local subkernels. ...
3
votes
1answer
120 views

Difference between Directory[] and NotebookDirectory[] .. a trailing /?

The following was the code: Directory[] NotebookDirectory[] The output was ...
1
vote
2answers
215 views

Can I run calculations on an external ssh server that doesn't have Mathematica installed? [closed]

I am currently running some rather compilex Mathematica calculations on my laptop and sometimes run into an out-of-memory errors. However, I have access to some larger simulation servers via ssh, but ...
6
votes
1answer
110 views

ClearAll[“Global`*”] stops working with Context set to 'unique to this Notebook'

I just changed my default notebook context to 'unique to this Notebook' so that variables don't roll across numerous open notebooks. Doing this, however, made the command ClearAll["Global*"] stop ...
1
vote
0answers
468 views

Configuring Remote Kernel via terminal in Linux

There's a server at work, which I would like to use as a remote kernel. I have access to it via terminal (server is running Red Hat, my client Windows 7). I don't know if the kernel is set up or not, ...
6
votes
2answers
349 views

Using NotebookDirectory in batch-mode

I am running Mathematica via the terminal (Linux) and my .m-script contains the command: ...
3
votes
0answers
39 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
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0answers
297 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. ...
1
vote
1answer
249 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, ...
4
votes
2answers
517 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 ...
1
vote
1answer
173 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 ...
2
votes
1answer
96 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 ...
19
votes
1answer
531 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 ...
5
votes
3answers
969 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 ...
4
votes
0answers
215 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 ...
5
votes
1answer
533 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
145 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 ...
4
votes
1answer
536 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 ...
6
votes
1answer
348 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
303 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 ...
7
votes
1answer
547 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 ...
5
votes
3answers
256 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 ...
9
votes
2answers
300 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
213 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 ...
10
votes
2answers
197 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 ...
7
votes
2answers
117 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
228 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
581 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 ...
14
votes
2answers
249 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?
5
votes
0answers
150 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 ...
4
votes
1answer
65 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?
6
votes
1answer
330 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 ...
3
votes
1answer
1k 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
603 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 ...
7
votes
1answer
124 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 ...
10
votes
2answers
596 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 ...
9
votes
2answers
776 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
174 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
2k 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
512 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
616 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 ...
28
votes
4answers
2k 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 ...
7
votes
3answers
953 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 ...
19
votes
2answers
2k 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 ...
8
votes
2answers
277 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: ...
27
votes
4answers
2k 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 ...
12
votes
1answer
625 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 ?