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### Achieve performance that is competitive with numpy [duplicate]

What are the best practices to ameliorate time performance of Mathematica? As a practical example how we can decrease timing below? ...
806 views

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111 views

### Threshold elements in a table [duplicate]

I'm new to Mathematica. I hope this is not a too stupid question, but I couldn't find a solution in the Mathematica documentation. My question is about creating a function to iterate over the ...
140 views

### Is there a cleaner/shorter way to select-replace in matrices? [duplicate]

I love Mathematica, but I find it oddly lacking when it comes to how matrices are handled. Here is an example of code that works but seems like it should be a lot shorter (and minus the loop). I'm ...
111 views

### An equivalent in Mathematica [duplicate]

Let's say I have a $n$x$m$ matrix $M$ in Matlab and I want to substitute the elements of $M$ that exceed $15$ for $-1$. In Matlab I just write M(M>15)=-1 and ...
58 views

### Choosing data from list and plot [duplicate]

I have a data set like below: Angle={5.48575, -0.669213, 45.9832, 8.63878, -16.8777, 50.022, -41.8882, -45.956, 28.3005, 35.8234} Now want to select the ...
8k views

### Can one identify the design patterns of Mathematica?

... or are they unnecessary in such a high-level language? I've been thinking about programming style, coding standards and the like quite a bit lately, the result of my current work on a mixed .Net/...
2k views

### Element-wise test on List elements

This question could sound pretty silly but I can't find a way to apply element -wise tests to a list. For example if I digit ...
831 views

### Sierpinski carpet with GraphData

Is this graph in the list among the so-called "standard" structures used in GraphData? However, I have not found yet anything like "Carpet" or "Sponge" in the list ...
2k views

### Why are numeric division and subtraction not handled better in Mathematica?

There is something that has been troubling me for a while. At least through version 10.0 the performance of a / b and a - b is ...
3k views

### Why is ParallelTable slower than Table?

Update Following a comment of Szabolcs have changed Timing to AbsoluteTiming. The results are virtually the same. Original post I have accidentally observed the following surprising result. So, why ...
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### Emulating R data frame getters with UpValues

What's the best way to emulate R's data frames functionality? This includes the ability to select rows and columns in a 2-dimensional table by the string identifiers positioned typically in the first ...
759 views

### Select seems unusually slow

I haven't been doing nearly as much Mathematica as I really should for the past few months, and in order to get my head back in the game I've been using it to run roughshod over easy Project Euler ...