While browsing the code of some project I came across the following statement: ++x %= 10; Is this statement well defined in C++ or does it fall into the same category as a[i] = i++ ? Answer As per C++11 1.9 Program execution /15: Except where noted, evaluations of operands of individual operators and of … Read more
I am working on an embedded system running Linux on a DSP. Now we want to make some parts of it scriptable and we are looking for a nice embeddable scripting language. These scripts should integrate nicely with our existing C++ code base, be small and fast. I understand that Lua is the industry choice … Read more
If I have a list of items like this: local items = { “apple”, “orange”, “pear”, “banana” } how do I check if “orange” is in this list? In Python I could do: if “orange” in items: # do something Is there an equivalent in Lua? Answer You could use something like a set from … Read more
I’m currently learning lua. regarding pattern-matching in lua I found the following sentence in the lua documentation on lua.org: Nevertheless, pattern matching in Lua is a powerful tool and includes some features that are difficult to match with standard POSIX implementations. As I’m familiar with posix regular expressions I would like to know if there … Read more
As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for … Read more
Recently I wrote a bit of Lua code something like: local a = {} for i = 1, n do local copy = a — alter the values in the copy end Obviously, that wasn’t what I wanted to do since variables hold references to an anonymous table not the values of the table themselves … Read more
I’ve some currently some Lua code using the following syntax: if (foo == nil or foo == ”) then foo = “some default value” end The goal of the if condition is to test foo is neither an empty string, neither a nil value. Can this code be simplified in one if test instead two? … Read more
I have come across few (Machine learning-classification problem) journal papers mentioned about evaluate accuracy with Top-N approach. Data was show that Top 1 accuracy = 42.5%, and Top-5 accuracy = 72.5% in the same training, testing condition. I wonder how to calculate this percentage of top-1 and top-5? Can some one show me example and … Read more
I need to make a conditional that is true if a particular matching text is found at least once in a string of text, e.g.: str = “This is some text containing the word tiger.” if string.match(str, “tiger”) then print (“The word tiger was found.”) else print (“The word tiger was not found.”) How can … Read more
I need a Torch command that checks if two tensors have the same content, and returns TRUE if they have the same content. For example: local tens_a = torch.Tensor({9,8,7,6}); local tens_b = torch.Tensor({9,8,7,6}); if (tens_a EQUIVALENCE_COMMAND tens_b) then … end What should I use in this script instead of EQUIVALENCE_COMMAND ? I tried simply with … Read more
