# Tag Info

Accepted

### Parallelize Map and ParallelMap

I did a bit of debugging to find the cause of the problem. After I found it, the problem no longer seems as outrageous as it looked at first sight. The root cause of the problem is the following ...
• 224k
Accepted

### Metropolis-Hastings Algorithm - Significantly slower than Python

Here a bit of inspiration for you. The following code should be approximately as fast as your Python code. Preparation: ...
• 94.9k
Accepted

### Can A Plot Be Overlayed With A Map?

Please see the Utility function section for a concise summary. An arbitrary density plot for the example: ...
• 264k
Accepted

### Element-wise test on List elements

To my knowledge, there aren't built-in versions for comparison operators that would be automatically threaded over lists. One reason for that is that Mathematica is a symbolic system, and every auto-...
• 111k

### Element-wise test on List elements

The BoolEval` package does exactly this. For example: BoolEval[{0.6, 1.2} > 1] (* Out: {0, 1} *) and ...
• 68.7k
Accepted

### Mapping on leaves

A little "secret" of level specifications is that they can be negative. -1 refers to the atomic leaves, -2 refers to all ...
• 224k
Accepted

### Map every second element of a list

Edit Ok, so an incorrect answer producing arrays like: {{"0.", RGBColor["0.00000000000", "0.00000000000", "0.00000000000"]}} received +12 and an accept. Let's ...
• 132k

• 55.8k
Accepted

### How to make a matrix of derivatives?

See D (search for Hessian): D[f[x, y], {{x, y}, 2}]
• 213k