To display the value of the symbol a in kernel 'Local'.įor example, in the following animation, I create two notebooks, one using the kernel 'Local', and the other using the kernel 'Debug'. Then, in a notebook running the kernel 'Debug', you can evaluate: Dynamic For example, suppose you have a running computation in kernel 'Local'. With multiple kernels, you can use Dynamic with the Evaluator option to display the value of a symbol in a different kernel. For instance, the following returns the list of evaluators that have been defined: CurrentValue

You can create additional kernels using the Evaluation | Kernel Configuration Options menu item. Then, you can use Dynamic (or other symbols that take an Evaluator option, e.g., Button or Cell) to display the value of a symbol in another kernel. First, you need to make sure that your version of Mathematica has multiple kernels defined. I had a stylesheet approach that is not nearly as effective as MrWizard's answer, so I have removed that part of my original answer. This is in fact a situation that I currently use, and one where I don't think the other answers will work. In this situation, one might want to ask the master kernel to check on the status of the slave kernel, and report back diagnostic information. Wrapping an argument of a function in Unevaluated is effectively the same as temporarily setting the attribute Hold for that argument meaning that the argument isn't evaluated until after it's inserted in the definition of that function. It is possible to communicate with the master kernel using the Channel framework. 3 + If False, 1, Unevaluated Sequence returns 3. Suppose you have a remote machine, with two kernels, a master/monitor kernel, and a slave/working kernel. The phrase if and only if is used commonly enough in mathematical writing that it has its own abbreviation. So, you might ask, when would the front end not be available? The method I proposed using multiple kernels will work even when the front end is not accessible.

This command has a literal equivalent Set: we could equivalently write Set x,y. The immediate assignment is performed with the equal sign (), say x y, which means 'assign to x the value that y has right now'. The other answers provide a good way to add dynamic monitoring using a single kernel when access to the front end is available. There are two assignment commands in Mathematica: immediate and delayed assignment.

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